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FCE 311 GEOTECHNICAL ENGINEERING COURSE OUTLINE AND GENERAL OVERVIEW Department of Civil & Construction Engineering University of Nairobi

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FCE 311 GEOTECHNICAL ENGINEERING

COURSE OUTLINE AND

GENERAL OVERVIEW

Department of Civil & Construction Engineering

University of Nairobi

Page 2: 1 overview

Course Description

 • This course is an introductory part of Soil

Mechanics, which focuses on soil formation, soil structures, physical properties of soils, soil classifications, soil compaction and permeability.

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Student Learning Outcomes

• Competence in the principles of soil mechanics

• Ability to list the relevant engineering properties of soils and their characteristics and describe the factors which control these properties.

•  Apply laboratory methods of determining the properties of soils.

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Student Learning Outcomes

• Ability to identify common situations when the soil becomes a factor in an engineering or environmental problem.

• Ability to apply basic analytical procedures to obtain the engineering quantity desired and understand their limitations.

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Teaching Methodology and Techniques

• This course relies on lectures and Power Point presentation by the lecturer. Worked examples will be offered. Students will then be required to contribute to discussions based on the explanations and will need to read the corresponding section in the assigned textbook.

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Detailed Course outline:

Lesson 1:• Introduction - definitions of Soil Mechanics

and Soil.

• Soil formation - physical and chemical weathering, residual and alluvial soils, and tropical soils.

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Detailed Course outline:

Lesson 2:• Clay mineralogy, soil structure, Lesson 3:• Basic properties, Phase relationshipsLesson 4:Physical properties of soils, water content,

specific gravity, bulk and dry densities, field densities.

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Detailed Course outline:Lesson 5:• Consistency and plasticity of soils.Lesson 6:• Determination of soil properties by laboratory

testingLesson 7:• Particle size analysis and Lesson 8:Soil description and Classification

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Detailed Course outline:Lesson 9:• Soil compaction, laboratory and field

compaction tests. Dry density/water content/air content relationships.

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Laboratory tests

• Liquid Limit determination• Plastic Limit determination• Dry Density Determination using Sand

Replacement• Particle Size Distribution Determination by

Dry Sieving• Compaction Tests• Specific Gravity of Soils

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Assessment

• Lectures – Mandatory • Laboratory tests – 10%• CAT – 20%• Final Examination – 70%

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General Overview

ground

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Typical Geotechnical Project

construction site

Geo-Laboratory~ for testing

Design Office~ for design & analysis

soil samples

soil properties

design details

01/05/23

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GEOTECHNICAL APPLICATIONS

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Shallow Foundations

15bed rock

firm ground

~ for transferring building loads to underlying ground

~ mostly for firm soils or light loads

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Shallow Foundations

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Deep Foundations

17

bed rock

weak soil

PILE

~ for transferring building loads to underlying ground

~ mostly for weak soils or heavy loads

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Deep Foundations

18Driven timber piles

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Retaining Walls

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~ for retaining soils from spreading laterally

RoadTrain

retaining wall

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Earth Dams

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~ for impounding water

soil

reservoirclay core shell

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Concrete Dams

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reservoir

soil

concrete dam

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Concrete Dams

22Three Gorges Dam, Hong Kong

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Concrete Dams

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Earthworks

24Roadwork

~ preparing the ground prior to construction

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Geofabrics

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~ used for reinforcement, separation, filtration and drainage in roads, retaining walls, embankments…

Geofabrics used Isiolo Airport

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Reinforced Earth Walls

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~ using geofabrics to strengthen the soil

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Soil Nailing

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~ steel rods placed into holes drilled into the walls and grouted

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Sheet Piles

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~ sheets of interlockingsteel or timber driven into the ground, forming a continuous sheet

ship

warehouse

sheet pile

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Sheet Piles

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~ resist lateral earth pressures

~ used in excavations, waterfront structures, ..

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Sheet Piles

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~ used in temporary works

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Cofferdam

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~ sheet pile walls enclosing an area, to prevent water seeping in

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Landslides

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Tunneling

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Blasting

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For ore recovery in mines

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Ground Improvement

35Impact Roller to Compact the Ground

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Ground Improvement

36Sheepsfoot Roller to Compact Clay Soils

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Ground Improvement

37Smooth-wheeled Roller

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Ground Improvement

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Big weights dropped from 25 m, compacting the ground.

Craters formed in compaction

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Environmental Geomechanics

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Waste Disposal in Landfills

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Instrumentation

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~ to monitor the performances of earth and earth supported structures

~ to measure loads, pressures, deformations, strains,…

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Soil Testing

Cone Penetration Test Truck

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Soil Testing

More Field Tests

Standard Penetration TestVane Shear Test

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Soil Testing

43Triaxial Test on Soil Sample in Laboratory

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Soil Testing

44Variety of Field Testing Devices

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Typical Safety Factors

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Type of Design Safety Factor

Probability of Failure

Earthworks 1.3-1.5 1/500

Retaining structures

1.5-2.0 1/1500

Foundations 2.0-3.0 1/5000

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Great Contributors to the Developments in Geotechnical

Engineering

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Karl Terzaghi1883-1963

C.A.Coulomb1736-1806

WJM Rankine1820-1872 A.Casagrande

1902-1981

L. Bjerrum1918-1973

A.W.Skempton1914-

G.F.Sowers1921-1996

G.A. Leonards1921-1997

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Geotechnical Engineering Landmarks

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Leaning Tower of Pisa

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Our blunders become monuments!

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Hoover Dam, USA

50Tallest (221 m) concrete dam

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Petronas Tower, Malaysia

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Tallest building in the world

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Monuments

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and….

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Geo-engineering at UoN

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FCE 311Geotechnical Engineering I

FCE 411Geotechnical Engineering II

FCE 511Geotechnical Engineering III

PostGraduateGeotechnical Engineering

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Practicals

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~ five practical sessions~ closed footwear must be worn in the lab

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Some Suggestions

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Attend the lectures.

Develop a good feel for the subject.

It takes longer to understand from the lecture notes

It is practical, interesting and makes lot of sense.