introduction to soil mechanics geotechnical engineering · concrete dams reservoir soil concrete...
TRANSCRIPT
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SIVA1
Introduction to Soil Mechanics
Geotechnical Engineering
Dr. Attaullah Shah
ground
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Soil Mechanics= Soil+Mechanics
Branch of Science dealing with the structure,
Engineering properties and reactions (behavior) of soils
under loading and weathering.
Which studies theoretically and practically soils for
building of structures over it.
Knowledge of physics, mechanics, and hydraulics
applied to study the behavior of soils.
Also called Geo-Technique ( Geo-Tech Engineering)
Studies the mutual interaction of soils and structure.
The practice of Engineering which applies the principles
of soil mechanics to the design of engineering
structures is called soil mechanics Engineering or Geo-
technical Engineering.
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Objectives of Soil Mechanics
To perform the Engineering soil surveys.
To develop rational soil sampling devices and soil sampling methods.
To develop suitable soil testing devices and soil testing methods.
To collect and classify soils and their physical properties on the basis of fundamental knowledge of soil mechanics.
To investigate the physical properties of soil and determine the coefficients to characterize these properties.
To evaluate the soil test results and other applications as a construction material.
To understand various factors such as static and dynamic loads, water and temperature.
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5bed rock
firm
ground
Shallow Foundations
~ for transferring building loads to underlying ground
~ mostly for firm soils or light loads
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Shallow Foundations
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7bed rock
weak soil
Deep Foundations
P
I
L
E
~ for transferring building loads to underlying ground
~ mostly for weak soils or heavy loads
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Deep Foundations
Driven timber piles, Pacific Highway
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Retaining Walls
~ for retaining soils from spreading laterally
Road
Train
retaining
wall
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Earth Dams
~ for impounding water
soil
reservoir
clay
core shell
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Concrete Dams
reservoir
soil
concrete dam
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Concrete Dams
Three Gorges Dam, Hong Kong
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Concrete Dams
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Earthworks
Roadwork, Pacific Highway
~ preparing the ground prior to construction
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Construction hazard
~ an unwelcome visitor at an earthwork site.
A dead Anaconda python (courtesy: J. Brunskill)
What does it have
to do with Geo?#!
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Geofabrics
~ used for reinforcement, separation, filtration and
drainage in roads, retaining walls, embankments…
Geofabrics used on Pacific Highway
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Reinforced Earth Walls
~ using geofabrics to strengthen the soil
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Soil Nailing
~ steel rods placed into holes drilled into the walls
and grouted
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Sheet Piles
~ sheets of interlockingsteel or timber driven into
the ground, forming a continuous sheet
ship
warehouse
sheet pile
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Sheet Piles
~ resist lateral earth pressures
~ used in excavations, waterfront structures, ..
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Sheet Piles
~ used in temporary works
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Sheet Piles
~ interlocking sections
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Cofferdam
~ sheet pile walls enclosing an area, to
prevent water seeping in
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Landslides
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Shoring
propping and supporting the exposed walls to
resist lateral earth pressures
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Tunneling
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Blasting
For ore recovery in mines
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Ground Improvement
Impact Roller to Compact the Ground
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Ground Improvement
Sheep foot Roller to Compact Clay Soils
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Ground Improvement
Smooth-wheeled Roller
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Ground Improvement
Big weights dropped
from 25 m, compacting
the ground.
Craters formed in compaction
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Environmental Geomechanics
Waste Disposal in Landfills
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Instrumentation
~ 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 – Lavarach Barracks, Townsville
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Soil Testing
More Field Tests
Standard Penetration TestVane Shear Test
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Soil Testing
Tri-axial Test on Soil Sample in Laboratory
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Soil Testing
Variety of Field Testing Devices
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Typical Safety Factors
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 Terzaghi
1883-1963
C.A.Coulomb
1736-1806
WJM Rankine
1820-1872 A.Casagrande
1902-1981
L. Bjerrum
1918-1973
A.W.Skempton
1914-
G.F.Sowers
1921-1996
G.A. Leonards
1921-1997
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Geotechnical Engineering Landmarks
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Leaning Tower of Pisa
Our blunders become monuments!
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Hoover Dam, USA
Tallest (221 m) concrete dam
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Petronas Tower, Malaysia
Tallest buildings in the world
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and….
Monuments
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Some Suggestions
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.
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Course Plan
Teaching
Week
Topics to be covered Follow up
One - Introduction to the subject.
- Soil and its constituents: Weathering of rocks and
types of soil, Physical properties, e.g., water content, void-
ratio, porosity, degree of saturation, specific gravity, and
unit weight and their determination, Mass Volume
relationships.
Assignment#1.
Write a note on the importance of the
subject of Soil Mechanics for Civil
Engineering
Two Soil Classification:
Importance of soil classification, Atterberg limits, grain size
distribution, sieve analysis.
Three Soil Classification
Hydrometric analysis, Unified and AASHTO classification
and description of their subgroups
Assignment#2
Four Soil Exploration:
Purpose of soil exploration, soil exploration methods,
probing test, trenches and pits,
Five 1st Quiz
- Auger boring, Wash boring, Rotary drilling, Soil samples,
Distributed and undistributed samples.
Six Permeability and capillarity:
Definition, Darcy's law, Factors affecting permeability,
Laboratories and field determination of permeability
Assignment#3
Seven Capillarity and effects, bulking of sand, slabing of clay,
frost heave and its prevention, Theory of flow nets.
Assignment#4
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Eight Mid Term Test
Nine Compaction:
Definition, Compaction fundamentals, Moisture density
relationship, Compaction standard.
Assignement#5
Ten Factors affecting compaction, Field control and
measurements of in-situ density, Effect of compaction on
properties of soil
Eleven 2nd Quiz
Shear Strength:
Concept, Shear strength parameters, Coulomb's law,
shear strength of cohesive and non-cohesive soils,
Twelve Simple laboratory and field tests for determination of
shear strength of soils.
Assignement#6
Thirteen Consolidation:
Mechanics of consolidation, Theory of one dimensional
consolidation, assumptions and
Validity.
Fourteen Oedometer test and graphical presentation of data,
Compression index, Coefficient of compressibility.
Assignement#7
Fifteen 3rd Quiz
Time factor, Co-efficient of volume change and degree of
consolidation,
Sixteen Primary and secondary consolidation Assignment#8
Seventeen Primary and secondary consolidation
Eighteen Revision Comprehensive Assignment
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Distribution of Marks:
Sessional Marks: 60, as per following details:
Assignments: 10
Quiz: 10
Mid Semester Exam: 20
Practical/Viva voce Exam: 20
Final End Semester Exam: 40
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Some Suggestions
Work in groups.
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Some Suggestions
Thou shall not wait till the last minute.
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Exams
“Exam is like a box of chocolates; you never know what you are gonna get”