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ABOUT THIS SEMINAR This ACG seminar is to be presented by industry personnel involved in the geomechanical and ground support aspects of open pit mining. It will also explore the methodologies and technologies in the design, analysis, excavation and management of rock slopes. The presenters bring together a wealth of experience to share with seminar participants. SEMINAR TOPICS Groundwater Stress measurement Slope stability Coal, iron ore and metalliferous case studies Impact of structural anisotropy on material parameters Ground support and reinforcement Numerical models 14–16 April 2015 | Hilton Brisbane | Australia www.acg.uwa.edu.au Open Pit Slope Stability and Ground Support Seminar – metalliferous and coal mining SEMINAR FACILITATOR Winthrop Professor Phil Dight Australian Centre for Geomechanics Phil has been involved with the development and design of ground support for mining applications since 1975. Phil has extensive consulting experience in the geotechnical aspects of the mining industry, and has worked on open pit and underground metalliferous mining problems. Much of that early research work has now been formalised in the literature by others. Phil joined the ACG in 2008 and has since been working on stress memory effects in rocks, ground support applications and slope stability problems. REGISTRATION BROCHURE PRESENTATIONS From data to information: key considerations to get an effective slope stability monitoring system. Eric Audigé, Soldata Oceania Pty Ltd Mount Owen Mine barrier pillar. Wayne Bartlett, Thiess Pty Ltd Benefits of a step-path approach to rock slope design. Dr Norbert Baczynski, Ok Tedi Mining Ltd Dealing with difficult structures: data capture and wall design. Adrienna Brown, Thiess Pty Ltd Rockfall and design approach for possible mitigation systems. Roland Bucher, Geobrugg Australia Pty Ltd How geotechnical engineers can benefit from tactical and strategic slope monitoring using radar. Albert Cabrejo and Dr David Noon, GroundProbe Pty Ltd Winthrop Professor Phil Dight, ACG A case history of large deformation in a coal mine pit wall. Dr Tony Dutton, Golder Associates Pty Ltd Tackling uncertainty in open pit slope stability analyses. Dr Marc Elmouttie, CSIRO What is effective stress in a rock mass? – the effect of groundwater pressure in developing fracture systems. Dr Ian Gray, Sigra Pty Ltd Depressurisation in anisotropic rocks (or not getting caught between a rock and a hard place). Jon Hall, RPS Australia Asia Pacific A simple job, what could possibly go wrong? Ian Kelso, Rosegold Mining Design of slopes in weak rock – Voorspoed Mine case study. Professor Marc Ruest, The University of Queensland Whole of mine slope monitoring using highly integrated and rapidly acquired radar for greater safety, operational and business benefits. Garry Spencer, IDS Australasia Pty Ltd Chris Strawson, Rock Doctors Consulting Geotechnical risk management of open pit mines. Erin Sweeney, MMG Australia Ltd WHO SHOULD ATTEND? This seminar is designed for practical operational personnel, mine owners and planners, mining engineers, geologists, suppliers and researchers, as well as anyone involved in the day-to-day open cut metalliferous and coal mining operations.

Open Pit Slope Stability and Ground Support Seminar · analysis, excavation and ... Open Pit Slope Stability and Ground Support ... The dewatering and depressurisation of pits and

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Page 1: Open Pit Slope Stability and Ground Support Seminar · analysis, excavation and ... Open Pit Slope Stability and Ground Support ... The dewatering and depressurisation of pits and

ABOUT THIS SEMINARThis ACG seminar is to be presented by industry personnel involved in the geomechanical and ground support aspects of open pit mining. It will also explore the methodologies and technologies in the design, analysis, excavation and management of rock slopes.The presenters bring together a wealth of experience to share with seminar participants.

SEMINAR TOPICS• Groundwater• Stress measurement• Slope stability• Coal, iron ore and metalliferous case studies• Impact of structural anisotropy on material

parameters• Ground support and reinforcement• Numerical models

14–16 April 2015 | Hilton Brisbane | Australia

www.acg.uwa.edu.au

Open Pit Slope Stability and Ground Support Seminar – metalliferous and coal mining

SEMINAR FACILITATORWinthrop Professor Phil DightAustralian Centre for Geomechanics

Phil has been involved with the development and design of ground support for mining applications since 1975. Phil has extensive consulting experience in the geotechnical aspects of the mining industry, and has worked on open pit and underground metalliferous mining problems. Much of that early research work has now been formalised in the literature by others. Phil joined the ACG in 2008 and has since been working on stress memory effects in rocks, ground support applications and slope stability problems.RE

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TRAT

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PRESENTATIONS• From data to information: key considerations to get an effective slope

stability monitoring system. Eric Audigé, Soldata Oceania Pty Ltd• Mount Owen Mine barrier pillar. Wayne Bartlett, Thiess Pty Ltd• Benefits of a step-path approach to rock slope design.

Dr Norbert Baczynski, Ok Tedi Mining Ltd• Dealing with difficult structures: data capture and wall design.

Adrienna Brown, Thiess Pty Ltd• Rockfall and design approach for possible mitigation systems.

Roland Bucher, Geobrugg Australia Pty Ltd• How geotechnical engineers can benefit from tactical and strategic

slope monitoring using radar. Albert Cabrejo and Dr David Noon, GroundProbe Pty Ltd

• Winthrop Professor Phil Dight, ACG• A case history of large deformation in a coal mine pit wall.

Dr Tony Dutton, Golder Associates Pty Ltd• Tackling uncertainty in open pit slope stability analyses.

Dr Marc Elmouttie, CSIRO• What is effective stress in a rock mass? – the effect of groundwater

pressure in developing fracture systems. Dr Ian Gray, Sigra Pty Ltd• Depressurisation in anisotropic rocks (or not getting caught between

a rock and a hard place). Jon Hall, RPS Australia Asia Pacific• A simple job, what could possibly go wrong? Ian Kelso, Rosegold Mining• Design of slopes in weak rock – Voorspoed Mine case study.

Professor Marc Ruest, The University of Queensland• Whole of mine slope monitoring using highly integrated and rapidly

acquired radar for greater safety, operational and business benefits. Garry Spencer, IDS Australasia Pty Ltd

• Chris Strawson, Rock Doctors Consulting • Geotechnical risk management of open pit mines. Erin Sweeney,

MMG Australia Ltd

WHO SHOULD ATTEND?This seminar is designed for practical operational personnel, mine owners and planners, mining engineers, geologists, suppliers and researchers, as well as anyone involved in the day-to-day open cut metalliferous and coal mining operations.

Page 2: Open Pit Slope Stability and Ground Support Seminar · analysis, excavation and ... Open Pit Slope Stability and Ground Support ... The dewatering and depressurisation of pits and

14–16 April 2015 | Hilton Brisbane | Australia

How to register: [email protected]+61 8 6488 1130+61 8 6488 3300ACG, PO Box 3296 – Broadway Nedlands, Western Australia AUSTRALIA 6009

Open Pit Slope Stability and Ground Support Seminar – metalliferous and coal mining (1507) | 14–16 April 2015

EarlybirdPaid until 3 March 2015

StandardPaid after 3 March 2015

Standard 2,420 2,860

ACG Affiliate† 1,980 2,420

Student^ 440 660

† Please visit www.acg.uwa.edu.au/corp_affiliates to view the list of ACG Corporate Affiliates.

^ Students are required to provide proof of full-time enrolment.

Payment detailsPayment to accompany registration – Credit card or EFT. Please contact the ACG for bank details. Purchase orders are not accepted. All prices include GST. ABN 37 882 817 280

Total payment AUD __________________

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Name of Cardholder ______________________________________ Please print.

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Proceedings will not be available for sale after the event.

Receipt addressed to Cardholder Business

Registration fee includes ACG event proceedings (where available), luncheons and refreshments. Please notify us below of any special dietary requirements.

Contact detailsPlease print. *denotes mandatory fields.

*Title (Mr, Mrs, Miss, Ms, Dr, Prof., Other)

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All attendees will have their name, affiliation, address, telephone, fax and email address printed on the delegate list.

Do not include my details on the event delegate list.

If you require an invitation letter for Visa purposes, please forward a copy of your passport information page. For more information regarding Australian Visas, please visit www.immi.gov.au/visitors/_pdf/general-events.pdf.

DELEGATE CANCELLATIONSUp to 8 days before event commencement: An administration fee of $150 will be charged. 7 or less days before: no refund. Non-attendance: no refund. Substitutions will be accepted at any time. The ACG reserves the right to cancel the event if fewer than 16 registrations are received.

First Asia Pacific Slope Stability in Mining ConferenceAustralia | 2016

This inaugural conference will provide a special forum for best practice and state-of-the-art technologies that are targeted to the unique challenges and environs of the Asia Pacific region with respect to pit slope investigations, design, implementation and performance monitoring.

VENUE | ACCOMMODATIONHilton Brisbane190 Elizabeth St, Brisbane, AustraliaPh: +61 7 3234 2000 | [email protected]

The following Hilton room rates are available for event delegates:

• AUD275 with breakfast• AUD255 without breakfast

SEMINAR DINNER SPONSORSHIPBy sponsoring the seminar dinner, your company will provide an immediate guaranteed medium to reach the select and niche group of open pit mining personnel. Contact the ACG for more details.

www.apssim2016.com

Open Pit Slope Stability and Ground Support Seminar – metalliferous and coal mining

Page 3: Open Pit Slope Stability and Ground Support Seminar · analysis, excavation and ... Open Pit Slope Stability and Ground Support ... The dewatering and depressurisation of pits and

RECEIVED ABSTRACTS

Open Pit Slope Stability and Ground Support Seminar – metalliferous and coal mining

www.acg.uwa.edu.au

Benefits of a step-path approach to rock slope designNorbert Baczynski, Ok Tedi Mining Ltd, Australia

In many slopes, the Hoek–Brown rock mass strength parameters are only really applicable along segments and not the full length of critical failure paths through them. Hoek–Brown parameters should only be used along those segments where the failure path effectively traverses across the structural fabric of the rock mass. Whereas, a step-path approach comprising defects and intact rock/rock mass ‘bridges’ provides a more realistic shear strength assessment along those segments where the failure path traverses sub-parallel to dominant defect set orientation within the rock mass. Based on the structural model for a given rock mass, the target design slope is partitioned into zones that are either characterised by Hoek–Brown materials or by step-path materials. This hybrid approach provides a strength assessment that more realistically reflects actual conditions and failure mechanisms in the rock mass. The hybrid approach yields lower shear strength values than the Hoek–Brown approach. Because each input component to the shear strength analysis is statistically variable, strengths along critical failure paths are likewise statistically variable. This variability is scale-dependent and decreases with increasing length of the critical failure path; with the strength progressively approaching the mean value. Several pit slope examples are presented.

Depressurisation in anisotropic rocks (or not getting caught between a rock and a hard place)Jon Hall, RPS Australia Asia Pacific, Australia

The dewatering and depressurisation of pits and pit slopes to meet mining and mine design requirements can be difficult enough in relatively uniform rock and soil masses. Theoretically, it is relatively straightforward. If you have some data on the average hydraulic properties and understand the ambient groundwater flow processes, you can relatively simply assess what depressurisation can be achieved and how best to achieve it. Mind you, ask any mine site personnel and/or technical support teams responsible for installing and implementing pit dewatering or depressurisation and you may get a different story. Murphy’s Law is alive a well in mine water management and things have a habit of not going to plan, and usually at the worst possible time. Now add the complications of anistotropic conditions, which are more often the case, and things can start to get even more difficult. However, anisotropic conditions do not necessarily mean the end of the world. In some cases, anisotropic conditions can actually help to achieve depressurisation targets more easily than under more uniform conditions. The keys to dealing with anisotropy are to recognise that it is there, accept that you can’t change it, try to understand it as best you can, focus your depressurisation effort on where it can do the most good, accept that you might not be able to depressurise, and accept that there will always remain some residual uncertainty. This workshop presentation provides a high level overview of the key issues and concepts around anisotropy and some ideas on how to get around the many potential problems associated with anisotropy. It includes a number of specific examples from the author’s personal experience and some examples judiciously ‘borrowed’ from the literature. These include examples of where things went well… and some that didn’t.