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OBJECTIVES
This Symposium is organized as part of an ongoing research project. It intends toprovide a platform for some international and local experts with expertise in differentareas to share with participants their experience and research findings on the latesttechnologies and solutions on urban geotechnical construction and urbansustainability.
Who should attend?
Practicing engineers working in the geotechnical and consultancy industries;
Representatives from government agencies dealing with urban sustainability and infrastructure;
Researchers and students specialized in civil engineering or construction related works.
For single registration, click here.
For group registration ( by company representative), click here.
26 – 27 JULY 2017 @ SINGAPORE , 8:30AM – 5PM , Executive Centre at NTU @ One-North
S y mp os i u m
on
New Technologies for Urban
Geotechnical Constructions
Organized by Centre for Usable Space
Supported by
Geotechnical Society of Singapore
Singapore Rock Mechanics and Engineering Geology
Fees : SGD300Registration ends on 19 Jul 17
Pending for PDU and STU points For enquiries, please email [email protected]
www.ntu.edu.sg
Program for Day 1, 26 July ( Wednesday )
26 – 27 JULY 2017 @ SINGAPORE , 8:30AM – 5PM , Executive Centre at NTU @ One-North
S y mp os i u m
on
New Technologies for Urban
Geotechnical Constructions
Time Program Speaker
0830 Registration
0900 Opening
0910 Advances in the Prediction and Control of Ground Deformations
Prof Andrew J. Whittle (Massachusetts Institute of Technology, USA)
0955 Tea Break
1025 Research on Urban Geotechnical Solutions at NTU
Prof Chu Jian (NTU)
1110 Research on Bio-mediated and Bio-inspired Geotechnics at Netherlands and USA
Prof Leon Van Paassen (Arizona State University, USA)
1155 Building Assessment due to Adjacent Tunnelling Work
Prof Leung Chun Fai (NUS)
1240 Lunch
1340 Capillary Barrier as A Sustainable Slope Protection
Prof Harianto Rahardjo (NTU)
1425 Rock Engineering for An Underground Cavern Facility
Dr Zhou Yingxin (DSTA)
1510 Tea Break
1540 Mobile Borelog System Mr Tan Yong Beng (SIPL)
1625 Discussion
1700 End of Program
www.ntu.edu.sg
Program for Day 2, 27 July ( Thursday )
26 – 27 JULY 2017 @ SINGAPORE , 8:30AM – 5PM , Executive Centre at NTU @ One-North
S y mp os i u m
on
New Technologies for Urban
Geotechnical Constructions
Time Progam Speaker
0830 Registration
0900 Multi-scale Modeling of Microbial Induced Carbonate Precipitation in Sand
Prof Xiaohui Cheng (Tsinghua University, China)
0945 Tea Break
1010 Evaluation of Basal Heave Stability of Diaphragm Wall Supported Excavations in Clay
Prof Goh Teck Chee, Anthony ( NTU)
1055 Smart sensor technology for structural and geotechnical monitoring
Prof Yang Yaowen (NTU)
1140 Applications of Optical Fiber Sensors in Geotechnical Monitoring
Prof An-Bin Huang (National Chiao Tung University, Taiwan)
1225 Lunch
1320 Challenges for MRT infrastructure development in Singapore
Dr Goh Kok Hun (LTA)
1405 Design and Construction of Common Services Tunnel in Marina South Singapore
Dr Ng Tiong Guan (Golder Associates (Singapore) Pte Ltd)
1450 Tea Break
1515 Recent Developments of Soil Investigation In Japan
Mr. K. Orihara (Kiso-Jiban Consultants Co’ Ltd.)
1600 Recent Developments in Biocement and Biogrouting Techniques
Dr Cheng Liang (NTU)
1640 Discussion
1700 End of program
Prof Andrew J. Whittle Massachusetts Institute of Technology
USA
Prof Chu JianNanyang Technological University
Singapore
Prof Leon Van PaassenArizona State University
USA
Dr. Leung Chun Fai National University of Singapore
Singapore
Andrew J. Whittle is the Edmund K. Turner Professor of Civil & EnvironmentalEngineering at MIT. Dr Whittle is an expert in geotechnical engineering, whoseresearch deals principally with formulation of constitutive models for
representing the complex mechanical properties of soils and their application in predicting theperformance of foundations and underground construction projects. His research has been widelyused in the design of foundation systems for deep water oil production facilities and in majorurban excavation and tunneling projects including the Central Artery-Third Harbor Tunnel ('BigDig') in Boston, and Tren Urbano in San Juan, Puerto Rico. Most recently he has led researchefforts in the application of wireless sensor networks for monitoring underground waterdistribution systems and construction projects.
Dr Whittle is a Co-Editor of the International Journal of Numerical and Analytical Methods inGeomechanics (since 1999). He is an active consultant who has worked on more than 30 majoronshore and offshore construction projects and was an expert involved in the investigations intothe collapse of the Nicoll Highway in Singapore (2004-2006). He has also served on a series of majorreview panels: for the National Research Council and National Academy of Engineering (NRC/NAE)investigating the performance of hurricane protection systems in New Orleans; for the Governor ofMassachusetts on a 'stem-to-stern' safety review of the Big Dig tunnels in Boston; for the ChiefExecutive of Hong Kong investigating the delay in the works of the Hong- Kong section of theGuangzhou-Shenzhen-Hong Kong Express rail link (XRL); and as a member of the Board of Directorsfor the Massachusetts Department of Transportation (2009-2015).
Dr. Chu is a professor at the School of Civil and Environmental Engineering,NTU. He is also the Director of the Centre for Usable Space and the InterimCo-Director of the NTU- JTC Industrial Infrastructure Innovation Centre at NTU.
Dr Chu has more than 25 years’ research and consulting experiences in geotechnical engineering, inparticular in the areas of laboratory and in-situ testing, engineering properties of soils, soilimprovement and land reclamation.
Dr. Chu is the Vice Chair for ISSMGE TC217 on Land Reclamation and a committee member forISSMGE Technical Committee TC211 on Ground Improvement and two other ISSMGE technicalcommittees. He was the Chair for ISSMGE TC39 on Geotechnical Engineering for Disaster Mitigationand Rehabilitation from 2005 to 2009 and Vice-President of Geotechnical Society of Singapore from2009 to 2011.
Prof Harianto RahardjoNanyang Technological University
Singapore
Dr Zhou YingxinDefence Science & Technology Agency
Singapore
Mr Tan Yong BengSoil Investigation Pte Ltd
Singapore
Leon Van Paassen is Associate Professor at Arizona State University (ASU) atthe NSF Engineering Research Center for Bio-mediated and Bio-inspiredGeotechnics (CBBG). He received an MSc in Mining and Petroleum Engineering
in 2002 from Delft University of Technology (TUD) with a specialization in Engineering Geology.During and after his graduation he worked several years as a geotechnical engineer at IFCOFoundation Expertise and at research institute Deltares. In 2009 he obtained his PhD from theDepartment of Biotechnology of Delft University of Technology with a thesis on Biogrout:Microbially induced carbonate precipitation as ground improvement method. After his PhD hestayed at TUD as an Assistant Professor until 2016 when he moved to ASU. In his research heintegrates the fields of environmental biotechnology and geotechnical engineering, aiming todevelop sustainable solutions, which improve resource efficiency and reduce the environmentalimpact of civil and mining engineering industry.
Dr. LEUNG CHUN FAI is a professor in the Department of Civil andEnvironmental Engineering at the National University of Singapore. He has beena staff member of the department since April 1981. Professor Leung’s research
interest include centrifuge modelling, soil-structure interaction and offshore foundations. He haspublished many articles in international journals and delivered over 20 keynote/invited lectures ininternational geotechnical and offshore engineering conferences and serves on the editorial boardof several international journals including the prestigious Geotechnique. Professor Leung is the coremember of ISSMGE Technical Committee TC104 on Geotechnical Physical Modelling. He has servedas a geotechnical consultant for over 100 projects in Singapore and overseas including thedevelopment of Singapore’s new container ports and new integrated mega shipyard.
Dr. Harianto Rahardjo is currently a Professor of the School of Civil &Environmental Engineering, Nanyang Technological University, Singapore.Professor Rahardjo has served as the Head, Division of Infrastructure Systems
and Maritime Studies (2008-2014), the Vice-Dean and Associate Chair (Research), School of Civil &Environmental Engineering, NTU (1999-2007) and Director of NTU-PWD Geotechnical ResearchCentre, NTU (1996-1998). He has amassed over 35 years of teaching, research and consultingexpertise in geotechnical engineering. Professor Rahardjo’s research interests are in the behaviourof unsaturated tropical soils, the effects of flux boundary conditions on geotechnical structures,rainfall - induced landslides (assessments & instrumentation), soil improvement for tree stability,laboratory testing for saturated & unsaturated soils, specialised soil testing techniques & theirinterpretation, and numerical methods in geotechnical engineering.Professor Rahardjo has conducted extensive research on unsaturated soil mechanics to solvegeotechnical problems associated with tropical residual soils. These research activities are incollaboration with and supported by many major agencies. These include the Housing &Development Board, National Parks Board, Ministry of Education, Public Works Department,National Science and Technology Board, A*STAR, Building Construction Activity and SingaporeLand Authority. One of Professor Rahardjo’s most recent research activities involve the applicationof unsaturated soil mechanics in capillary barrier systems for slope stabilization and landfillcapping through laboratory testing, numerical analyses and field instrumentation. He has alsoapplied unsaturated soil mechanics to soil improvement for tree stability and to understanding theeffects of rainfall on tree stability.Professor Rahardjo is the co-author of the first textbook on unsaturated soils “Soil Mechanics forUnsaturated Soils“, by D.G. Fredlund and H. Rahardjo, published by John Wiley in 1993. He recentlyco-authored the second textbook “Unsaturated Soil Mechanics in Engineering Practice”, by D.G.Fredlund, H. Rahardjo and M.D. Fredlund and published by John Wiley in 2012. The details ofProfessor Rahardjo’s research works and the list of his publications can be accessed through theDigital Library (https://eps.ntu.edu.sg/client/en_US/usmsul/).
Dr. Zhou is Head Engineering (Underground Facilities) with the DefenceScience & Technology Agency and Adjunct Associate Professor at the NanyangTechnological University. He played a key role in the pioneering Underground
Ammunition Facility by DSTA and has been involved in several national initiatives in undergroundspace use.
He served as Vice President (Asia) of the International Society for Rock Mechanics (ISRM) andPresident of the ISRM Commission on Rock Dynamics. Dr Zhou is a member of the Board of theAssociated research Centers for the Urban Underground Space, member of the Advisory Board ofthe International Tunnelling Association Committee on Underground Space, and member of theEditorial Board for the International Journal of Tunnelling & Underground Space Technology.
Yong Beng is currently the Senior Manager in Soil Investigation Pte Ltd (SIPL).He joined the company in 2012 as the Pile Instrumentation Manager,subsequently appointed as Site Investigation Manager in 2014 and as Senior
Manager in 2015, respectively. He oversees the operations and development of the variousdepartments in the organization.
He graduated with a Bachelor Degree in Civil and Environmental Engineering from NanyangTechnological University in 2003. He has accumulated extensive overseas working experience oniconic projects during his career formative years, specializing in deep foundation testing. He laterhoned his skills with the Building and Construction Authority and subsequently took up a businessdevelopment role with a local property developer before joining SIPL.
www.ntu.edu.sg
Prof Xiaohui ChengTsinghua University
Beijing
Prof Anthony GohNanyang Technological University
Singapore
Prof Yang Yaowen Nanyang Technological University
Singapore
Prof An-Bin HuangNational Chiao Tung University
Taiwan
Dr Xiaohui Cheng is presently an Associate Professor in the department of CivilEngineering, Tsinghua University, Beijing. He received a Bachelor of Building
Structure and Master of Earthquake and Protection Engineering from Tsinghua University in 1994and 1997, and in TU Delft received a Ph.D. in Soil Mechanics in 2004, followed by a postdoctoralstudy at TUDelft and GeoDelft. He has undertaken more than 10 fundamental research projects,including the national and provincial natural science foundations, the 973 fundamental researchproject and international cooperation projects. Meanwhile he has been actively involved indifferent geotechnical consulting projects. The main research directions include geotechnicalelasto-plastic and thermodynamic constitutive theory, multi-field coupling mechanics, themechanics of granular materials, energy underground structures and microbial geotechnicalengineering. He has published about 30 SCI-indexed international journal papers, and about 50 EIand CSCD indexed conference and Chinese journal papers. His current H-index is 8. Currently he hasbeen authorized with seven Chinese National Invention Patents and served as (chief) editors forthree national geotechnical design standards or specifications.
Dr Anthony Goh is an Associate Professor in the School of Civil andEnvironmental Engineering at the Nanyang Technological University, Singapore.
He received his B.Eng (First Class Honours) and PhD from Monash University. Dr Goh is a registeredProfessional Engineer in Singapore. His teaching, research and professional practice have coveredmany aspects of geotechnical engineering including artificial intelligence, finite element analysis,earth retaining structures, slope stability, and soil-structure interaction
Dr Goh Kok Hun has more than 15 years of geotechnical engineeringexperience, and has been involved in the design aspects of several road and rail
infrastructure projects in Singapore, including the Fort Canning and the Woodsville road tunnelsand more recently the Downtown Line and Thomson-East Coast Line rail projects. He looks after theGeotechnical & Tunnels Division in the Land Transport Authority of Singapore, and is currentlyinvolved in several R&D projects to improve the way underground construction can be carried outin Singapore. He is registered as a professional engineer in civil engineering as well as a specialistprofessional engineer in geotechnical engineering, and a chartered professional engineer.
Dr Goh Kok HunLand Transport Authority
Singapore
Dr Ng Tiong GuanGolder Associates
Singapore
Mr. K. OriharaKiso-Jiban Consultants Co’ Ltd
Singapore
Dr Liang ChengNanyang Technological University
Singapore
Dr Yang Yaowen is currently an Associate Professor and Associate Chair of Schoolof Civil and Environmental Engineering, Nanyang Technological University,
Singapore. His research interests include smart materials for structural health monitoring, energyharvesting and uncertainty analysis of structural systems.
Dr Yang’s research has been well funded by the funding agencies and industry and his research hasresulted in numerous publications including books, monographs and around 180 journal andconference papers. He serves as an editorial board member of a few international journals and amember of ASME technical committee on energy harvesting.
Dr Liang Cheng has a PhD in Environmental Engineering with undergraduatestudies in Materials Science and Engineering. Dr Cheng completed his PhD in
Nov 2012 on a topic of “ground improvement by improved microbially induced CaCO3 precipitationtechnology” at Murdoch University (Australia), where he subsequently became a post-doctoralresearch fellow, working on NCEDA funded project entitled “Modelling, Monitoring and Control ofRO biofouling”. Then, Dr Cheng joined Curtin University (Australia) as a post-doctoral researchfellow in April 2015, and then Nanyang Technological University (Singapore) in Oct 2016. He hasover 8-year experience in the field of biotechnology, geoenvironmental engineering, and bio-electrochemistry with particular emphasis on bio-mediated ground improvement, wastewatertreatment, and microbial fuel cell based biosensor. His recent researches focus on artificial coralreef through biocalcification and optimization of bio-mediated ground improvement throughmicrobially/enzymatically induced mineral precipitation. He has published 35 manuscripts,including 27 refereed journals papers. He received an honorable mention in the 2014 R M QuigleyAwards, for the best paper published in the Canadian Geotechnical Journal in 2013.
Dr. An-Bin Huang is a retired professor at the department of civil engineeringof National Chiao Tung University, Hsin-Chu, Taiwan. With a BS degree in civil
engineering (National Taiwan University, Taipei, Taiwan), MS (Northwestern University, Evanston,Illinois, USA) and Ph.D. (Purdue University, W. Lafayette, Indiana, USA) in geotechnicalengineering, Prof. Huang embarked on his research efforts in fiber optic sensing about 15 yearsago. He established the first fiber optic sensing laboratory (the Optic Lab) in Taiwan that has beendedicated to geotechnical/civil engineering applications. Among the many available techniques,Optic Lab has been concentrating their research efforts on optical fiber Bragg grating (FBG) sensordevelopments. The Optic Lab under the leadership of Prof. Huang has been developing a series ofFBG techniques and succsessfully implimenting them in the field for cases such as landslide, groundsubsidence, bridge foundation scouring, and dike safety monitoring, among others. Prof. Huanghas been publishing extensively on the subject of FBG sensing and its applications in geotechnicalengineering, giving numerous invited lectures on fiber optic sensing at various internationalconferences, seminars or short courses.
Dr Goh Kok Hun has more than 15 years of geotechnical engineeringexperience, and has been involved in the design aspects of several road and railinfrastructure projects in Singapore, including the Fort Canning and the
Woodsville road tunnels and more recently the Downtown Line and Thomson-East Coast Line railprojects. He looks after the Geotechnical & Tunnels Division in the Land Transport Authority ofSingapore, and is currently involved in several R&D projects to improve the way undergroundconstruction can be carried out in Singapore. He is registered as a professional engineer in civilengineering as well as a specialist professional engineer in geotechnical engineering, and achartered professional engineer.
Dr Ng Tiong Guan is the immediate past president of the Geotechnical Society ofSingapore. He graduated from the University of Technology Malaysia withBachelor in Civil Engineering 1st Class Hons. Degree in 1992 and obtained his
PhD degree from the National University of Singapore in 1999. He worked in BBR GroundEngineering as design engineer from 2000 before setting up GeoEng Consultants, a specialistgeotechnical consulting firm, in Feb 2002 together with Dr Indra. GeoEng Consultants merged withGolder Associates in Nov 2011. Dr Ng is currently the Principal and Executive Director of GolderAssociates Singapore.Dr Ng has more than 15 years of experience in geotechnical consultancy for foundation, deepexcavation, earth retaining system and ground improvement. He has been involved in the designand supervision of earth retaining structures for several major projects in Singapore including theworld 1st underground MRT Depot (Circle Line Contract 821), Geylang River Cross for Kallang PayaLebar Expressway Contract 421, Common Services Tunnels, Marina Bay Sands WP8402 – thedeepest excavation within MBS for cut and cover tunnels below Bayfront Avenue and DowntownLine Contract 902 – Promenade Station. He is currently involved in Thomson East Coast LineContract T310 Bayshore Station, Land preparation and infrastural works for future Changi AirportTerminal 5.
Mr. K. Orihara is a managing director of overseas operational headquartersof Kiso-Jiban Consultants Co’Ltd. He has been involved in numerous projects
in Singapore and Southeast Asia as a geotechnical engineer for more than 30 years. Main projectsinvolved are MRT NE & EW lines and NE line, reclamation in Jurong/Marina/Tekong, Malaysis-Singapore 2nd Crossing, Esplanade, etc.
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Advances in the Prediction and Control of Ground Deformations
This lecture will compare recent experience in the application of advanced constitutive models in the prediction and control of ground movements in four distinct classes of problem: 1.) Urban excavation where we have demonstrated control of ground deformations through integration of modeling and measurements for an 18m deep floating excavation support system for the Courthouse Station in Boston. 2.) Mechanized tunneling where simplified analytical methods can be used. For Crossrail tunnels (London) in stiff clay, we show that ground deformations at a greenfield site can be well described by a set of three cavity deformation parameters, and are then able to predict structural response for these same parameters. 3.) We have investigated the effectiveness of pre-fabricated vertical drains as a non-intrusive method for mitigating the damage to pile-supported wharf structures, for a typical structure in California. These analyses require models that can handle the complex soil response (liquefaction), pile-soil interactions, with coupled flow and deformations. 4.) geotechnical predictions of long-term settlements are needed for large fills on deep clay layers such as those associated with offshore airports such as Kansai in Japan. We have developed a new constitutive model to improve predictions. This MIT-SR model can represent diverse observations of primary consolidation for clay layers of different thicknesses, providing a unifying framework that can resolve the long-standing paradox of coupled consolidation and creep behavior (Hypotheses A and B).
Research on Urban Geotechnical Solutions at NTU
An overview on the recent research work at NTU on the urban geotechnical solutions pertinent to Singapore ispresented. The topics include new land reclamation methods including methods to use soft fill materials for landreclamation, new soil improvement methods including biocement and biogrouting methods, new wasteutilization methods, and 3D geodata modelling and management systems.
Research on Bio-mediated and Bio-inspired Geotechnics at Netherlands and USA
In standard geotechnical engineering practice the composition of soils and related physical properties areconsidered to be static. However, biochemical processes in the subsurface can alter the composition of soils andchange the properties which determine the geotechnical behavior. These natural process are considered to beslow, but still they may be sufficiently fast to affect the durability of civil infrastructure. These processes may alsobe actively stimulated to change the properties of soils and enhance the engineering behavior. For example,biologically induced mineral precipitation can be used to increase the strength and stiffness of porous materials,mitigating liquefaction and erosion or improving bearing capacity of foundations and stability of slopes andexcavations in granular soils. At the same time, these minerals fill up pores and fractures and create (reactive)hydrological barriers which control migration of contaminants, prevent leakage during CO2 sequestration orimprove the durability of ageing construction materials. Many recent developments involve Microbial InducedCalcium carbonate Precipitation (MICP). However, there are many other minerals that can be formed bystimulating indigenous microbial activity. Also formation of biofilms and biologically produced gas or changes inthe pore water chemistry can be used to alter material behavior in engineering applications. This presentationprovides an overview on recent advances, including experimental studies at various scales, using either specificmicro-organisms or enrichment of indigenous microbial communities, theoretical and numerical studies aimed toimprove fundamental insight on the biogeochemical conversions and coupled to the hydro-mechanicalproperties. Besides the scientific and technological advances, also market potential, sustainability performanceand other factors, which determine the successful implementation of these new bio-based technologies arediscussed.
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Building Assessment due to Adjacent Tunnelling Work
With increase in tunnelling activities in Singapore, many new tunnelling projects are conducted close toor beneath existing structures. This lecture first provides an overview on existing approaches on assessingthe effects on tunnelling on adjacent buildings. A joint research collaboration between NUS and HDB toinvestigate the interaction between foundations of HDB buildings and tunnelling has been in force for thepast years. This lecture will present the research findings on building assessment arising from adjacenttunnelling work. These include centrifuge model studies, numerical and analytical modelling, and if timepermits, case studies.
Capillary Barrier as A Sustainable Slope Protection
Rainfall-induced slope failures are a common problem in tropical countries covered by residual soils likeSingapore. One possible novel preventive measure against rainfall-induced slope failure is using capillarybarrier. A capillary barrier is a two-layer system of distinct hydraulic properties that is used as a coversystem. The distinct hydraulic properties prevent water infiltration into the soil below the capillary barriersystem by utilizing unsaturated soil mechanics principles. The mechanics and performance of CapillaryBarrier System (CBS) as a slope protection have been investigated through laboratory tests, numericalanalyses and field tests at Nanyang Technological University (NTU), Singapore. Several slopes protected byCBS have been constructed and fully instrumented. The results of this study on CBS illustrate goodperformance of CBS as a slope protection against rainfall-induced slope failures. In addition, the use ofrecycled materials as capillary barrier materials have been studied and found to be feasible. An improvedsystem using Dual Capillary Barrier (DCB) has been developed and shown to be more superior to theSingle Capillary Barrier (SCB). A retaining wall system incorporating capillary barrier principles, namedGeoBarrier System (GBS) has also been developed for its use in underground basement carpark. Thevegetation can be placed on top of GBS to soften the hard appearance and reduce the glaring effect anddampen noise level generated. The use of recycled materials in CBS (single and dual) and GBS as well asthe additional greenery within GBS meet one of the objectives of Singapore’s long-term growth throughthe development of capillary barrier as a sustainable slope protection. This study on CBS and GBS for slopeprotection and retaining wall also exemplifies the application of unsaturated soil mechanics to engineeringpractice.
Rock Engineering for An Underground Cavern Facility
This presentation discusses the key components of rock engineering for a major underground cavernfacility project related to the planning, design and construction of large-span tunnels and caverns in hardrock. It covers technologies and strategies for geological investigations and modelling, rock massclassification and empirical methods for rock support design, design analysis, instrumentation andmonitoring, as well as key issues related to rock excavation such as water control and grouting, and safeuse of explosives and blasting vibrations. The facility was constructed in granite rock. Permanent rocksupport is a combination of rock bolts and shotcrete. It will be demonstrated that safe and cost-effectiverock cavern construction can be achieved with a well-planned and executed rock engineering programme,supported with the innovative use of technologies, design optimisation, risk sharing, and collaborationamong the client, consultant, and contractor.
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Mobile Borelog System (MBS) – a breakthrough mobile-based data collection tool for soil investigation
The Mobile Borelog System (MBS) is a mobile based data collection tool to streamline the manual processof gathering borehole drilling information, in-situ tests conducted and its related activities. The currentsystem of manually documenting the information is both time-consuming and exhaustive. In addition, themanual data has to be inputted by different departments’ into their respective Excel worksheets to trackprogress, prepare borehole reports and calculate meterage. This duplication of effort could result in datainconsistencies and has been causing staff to be less productive. MBS was designed to address this nichearea of where the data will be inputted into a backend web-based application from the onsite Geologistsat the point of source itself through harnessing mobile technology. Designed to work both on iOS andAndroid platforms, the data inputted in the mobile devices like smartphones and tablets will be submittedto the backend server seamlessly. Various departments can then easily pull out the submitted informationthrough customized reporting that does all the calculations and tabulations into a user friendly format foranalyzing and further processing. This eliminates the duplication of data entry and significantly lowers thepossibility of data error. Significant amount of work time is saved from circulating the manual data anddata entry efforts. Productivity is increased across all departments as they are able to obtain theinformation they require in the format of their choice to aid them in their primary job function.
Multi-scale Modeling of Microbial Induced Carbonate Precipitation in Sand
MICP technology has been a research subject in geotechnical engineering and construction materialscience for decades. One of challenging topics is to understand the impacts of different underlyingmechanisms on the mechanical properties of MICP modified sands. A multi-scale experimental andnumerical investigation has been carried out, leading to a robust MICP technology.
Evaluation of Basal Heave Stability of Diaphragm Wall Supported Excavations in Clay
Flexible sheetpile walls and stiff diaphragm walls are commonly used for braced excavations in deepdeposits of soft clays. While a number of numerical studies have shown that there is a general trend ofdecreasing wall movements with increasing wall stiffness particularly when the basal heave factor ofsafety is low, only limited studies have been carried out to examine the influence of the use of stiffretaining walls systems such as diaphragm walls on the basal heave factor of safety. The focus of thispresentation is on the assessment of basal heave instability for deep excavations in soft clay usingnonlinear finite element analyses. In addition, comparative calculations of the basal heave factor of safetyhave been performed using conventional limit equilibrium methods
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Smart sensor technology for structural and geotechnical monitoring
This presentation reports the applications of smart sensors like PZT and fiber optic sensors for structuralhealth monitoring in civil engineering. Based on the electromechanical impedance and wavepropagation techniques, the PZT sensors can be used for SHM of metallic or concrete structures, withsurface bonded and/or embedded installations. Both FBG sensors and distributed fiber optic sensors likeBOTDR are very suitable for large scale monitoring of civil infrastructure. However, propercustomization, protection and calibration should be conducted to ensure their reliability and robustnessbefore applications. A potential wireless FBG sensing solution will also be introduced.
Applications of Optical Fiber Sensors in Geotechnical Monitoring
When properly made and installed, the fibre optic (FO) based sensors are durable, immune toelectromagnetic interference, short circuit and lightning, and thus are ideally suited for field monitoringof civil engineering systems. Over the past few decades, many FO sensing techniques have beendeveloped. Available techniques include fully distributive sensing method such as the Brillouin TimeDomain Reflectometry (BOTDR) that allows the entire optical fibre to function as a strain/temperaturesensor. The optical fiber Bragg grating (FBG) is another popular partially distributive FO sensingtechnique where multiple, discrete FBG’s can be connected via a single fibre. With their uniquecapabilities, FO based sensors can be used for long distance profile measurements or for localized highresolution and/or differential measurements, deployed above or below ground/water. A wide variety ofFO based sensor cables and transducers for strain, temperature, force, pressure, displacement andacceleration measurements have been developed. Techniques for the field deployment of FO basedsensors have gained maturity through decades of research and field experiments. The presentationprovides a brief background of FO sensing and the design concepts behind the BOTDR and FBG basedsensors. Cases of field geotechnical monitoring using the FO sensors are presented, implications in theirfuture developments and challenges are discussed.
Challenges for MRT infrastructure development in Singapore
The development of MRT infrastructures in Singapore faces several challenges today, in terms ofvariability in underground conditions, mitigating risks to public safety, tackling the manpower crunch,and dealing with infrastructure maintenance in the long-term. The presentation will discuss some ofthese challenges and current solutions, as well as attempt to take a peek into possible approaches thatthe future could bear.
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Design and Construction of Common Services Tunnel IN Marina South Singapore
Road/rail tunnels and underpasses are conventionally constructed using open trench or cut and covermethod. However, in areas where cut and cover method cannot be adopted, for instance in areas wherethe proposed tunnel or underpass is located below existing structure, road, canal, utilities or servicesthat cannot be diverted or relocated, the alternative is to adopt trenchless construction method. Varioustrenchless construction methods including NATM, piped roofing, rectangular tunnel boring machine etchave been used in Singapore. This paper provides overview of various trenchless construction methodsadopted in Singapore in recent years. The design and construction of four LTA projects involvingtrenchless construction will be shared in this paper. The first three projects involve the use of pipe boxtunnel incorporating mined excavation method in Downtown Line Contract 903 Bugis Station, SentosaGateway Tunnel Contract ER296 and Thomson Line Contract T220 Great World Station. The geologicalsetting in these projects varies from thick deposit of very soft Kallang Formation in C903, to JurongFormation in ER296 and Kallang Formation overlying Bukit Timah Formation in T220. The forth projectadopts box jack rectangular tunnel boring machine method for construction of a 150m longunderground pedestrian tunnel for Thomson Line Contract T221 Havelock Station.
Recent Developments of Soil Investigation In Japan
There is a demand of high quality of measured soil properties in Japan. To meet the marketrequirement, undisturbed sampling and in-situ testing techniques have been newly developed. They areundisturbed sampling of sand and gravel, namely Gel Push (GP) Sampler, new generation ofpressuremeter test to determine in-situ c and φ, and geotomography to visualize the subsoil structures.Geotechnical information management system is also rapidly developed. The talk will brief all these newtechnologies in soil investigation and information management and discuss their applications toSingapore.
Recent Developments in Biocement and Biogrouting Techniques
Biocementation is a recently developed technique for soil stabilization in geotechnical engineeringapplications, as it employs microbiological activity that improves the engineering properties of soils. Oneof the most commonly adopted processes to achieve soil stabilization by biocementation is throughmicrobial induced calcite precipitation (MICP), which is commonly known as “biogrout”. This techniqueutilizes the metabolic pathways of bacteria to form calcite (CaCO3) that binds the soil particles together,leading to increased soil strength and stiffness. Biogrout is environmentally-friendly and has thepotential to be a better alternate to chemically-based grouting materials such as lime or cement. Otherthan soil improvement, MICP can also be used in many other civil engineering applications, such as dustand wind erosion control, bio-clogging for fractured rock permeability reduction, internal erosioncontrol, corrosion protection by surface bio-coating, bio-self-healing of concrete, etc.. However, thereare still many challenges that lay ahead for future research prior to real practical applications of thispromising technique.
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PAYMENT Form Symposium on
New Technologies for Urban Geotechnical Constructions
Date: 26 & 27 July 2017 ( Wednesday & Thursday ), 8:30AM – 5PM Venue: Executive Centre at NTU@one-north (Next to Buona Vista MRT)
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Pending for PDU and
STU points
__________________________Company Stamp ( if applicable)
