soil mechanics
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Soil Mechanics in Engineering Practice Lectures
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Soil Mechanics Introduction and Definition
Soil mechanics is defined as the application of the laws and principles of mechanics and hydraulics to engineering problems
dealing with soil as an engineering material. Soil has many different meanings, depending on the field of study. To a geotechnical
engineer, soil has a much broader meaning and can include not only agronomic material, but also broken-up fragments of rock,
volcanic ash, alluvium, Aeolian sand, glacial material, and any other residual or transported product of rock weathering.
As the name Soil Mechanics implies the subject is concerned with the deformation and strength of bodies of soil. It deals with
the mechanical properties of the soil materials and with the application of the knowledge of these properties to engineering
problems. In particular it is concerned with the interaction of structures with their foundation material. This includes both
conventional structures and also structures such as earth dams, embankments and roads which are their-selves made of soil.
Soil Mechanics Engineering, advanced soil mechanics lecture notes
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Soil Constituents its types and properties Atterberg's Limits
Constituents of Soil
Sand, Silt, Gravel, Stones
Types of Soil
Dry, Saturated, Partially saturated, Coarse, Fine, Organic, Gravel, Sand,
Clay, Silt, Boulders, Cobbels, Peat
Properties
Voids ratio, Porosity, Degree of Saturation, Air Content, Water Content, Unit
weight, Bulk unit weight, Specific Gravity, saturated unit weight
1. Liquid limit | Determine Liquid Limit of soil
2. Plastic limit | Determine Plastic Limit of
soil
3. Shrinkage limit
4. Liquidity index
5. Flow index
6. Toughness index
Stresses in Soil Mass Soil
Analysis Compaction of Soil
Earth Pressure Palm
Islands Dubai Shear Strength of
Soil Index Properties RCC
Design Procedure Bearing
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Sieve Analysis & Particle Sizing Graphs Classification of Soil
The grain-size characteristics of soils that are predominantly coarse grained
are evaluated by a sieve analysis
A nest of sieves is prepared by stacking sieves one above the other with the
largest opening at the top followed by sieves of successively smaller
openings and a catch pan at the bottom of all the sieves
[Read More]
There are two soil classification systems in
common use for engineering purposes.
... [Read More]
1. AASHTO
2. Unified Classification System
3. MIT Classification System
Soil Stress Analysis Compaction of soil, its uses and
effects
Both immediate and consolidation settlement analysis requires estimate of
increase in pressure (ΔHσ) in the soil layers from the applied loads. Several
methods are available to estimate the increase in pressure at any depth z
from the applied load. ..... [Read More]
We will discuss:
1. 2:1 Slope method
2. Boussinesq Method.
Compaction is the application of mechanical
energy to a soil to rearrange the particles and
reduce the void ratio.. [Read More]
1. Purpose of compaction
2. Factors affecting compaction
Modes of Shear Failure in Soil Earth Pressure
1. Pressure at rest
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There are three modes of shear failure, i.e. General, Local and Punching
shear failures depending upon the compressibility of soil and depth of footing
with respect to its breadth (i.e D/B Ratio). When the ultimate bearing capacity
of the soil is reached, it may fail in one of the following three failure mode
depending upon the type of soil and depth to width ratio of the footing (i.e.
D/B)......... [Read More]
2. Active earth pressure
3. Passive earth pressure
4. Co efficients of earth pressure
Types of Soil Settlement Methods of Determining Soil Bearing
Capacity
A soil shear failure can result in excessive building distortion and even
collapse. Excessive settlements can result in structural damage to a building
frame nuisances such as sticking doors and windows, cracks in tile and
plaster, and excessive wear or equipment failure from misalignment resulting
from foundation settlements.
It is necessary to investigate both base shear resistance (ultimate bearing
capacity) and settlements for any structure. In many cases settlement criteria
will control the allowable bearing capacity...... [Read More]
◾ Analytic method i.e. through bearing
capacity equations like using Terzaghi
equation, Meyerhof equation, Hansen
equation etc
◾ Correlation with field test data e.g.
Standard penetration test (SPT), Cone
penetration test (CPT) etc
◾ On site determination of bearing
capacity e.g Plate load test, Pile load
test
◾ Presumptive bearing capacity
(recommended bearing capacity, in
various codes).... [Read More]
Index Properties of Soil Soil Bearing Capacity Analysis
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Soil Mechanics Q/A
1. How to calculate
structural foundation
in a structure?
2. What are the uses
of Direct shear test?
3. History of
Engineering
Materials?
4. Why metals are
useful engineering
materials?
5. How to finish
concrete?
The soil properties on which their classification and identification are based
are known as index properties..... [Read More]
The index properties which are used are:
◾ Grain Size Distribution
◾ Consistency Limits
◾ Plasticity Index
Plastic saturated soils (silts and clays) usually
cohesion less soil and are more susceptible to
bearing capacity failure.
For saturated plastic soils, the bearing capacity
often has to be calculated for different
conditionTotal Stress Analysis (Short term
condition) that uses the un-drained shear
strength of the plastic soil. Effective stress
analysis (Long term condition that uses the
drained shear strength parameters (c' & F') of
the plastic soil).... [Read More]
Shear Strength of Soil Determining Liquid Limit of Soil
Soils derive their strength from contact between particles capable of
transmitting normal as well as shear forces. The contact between soil
particles is mainly due to friction and the corresponding stress between the
soil grains is called the effective stress s'.
Thus, the shear strength of a soil is mainly governed by the effective stress.
Besides the effective stress between soil grains, the pore water contained in
the void spaces of the soil also exerts pressure which is known as pore
pressure, u. [Read More]
This testing method is used as an integral part of
several engineering classifications systems to
characterize the fine-grained fractions of soils
and to specify the fine-grained fraction of
construction materials. The liquid limit, plastic
limit and plasticity index of soils are also used
extensively, either individually or together, with
other soil properties to correlate with
engineering behavior such as compressibility,
permeability, compactibility, shrink-swell and
shear strength..... [Read More]
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