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SOIL MECHANICS


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UNIT I SOIL INTER RELATIONS 8
Nature of Soil – Problems with soil – Phase relation – Sieve analysis – Sedimentation
analysis – Atterberg limits – Classification for engineering purposes – BIS Classification
system – Soil compaction – Factors affecting compaction – Field compaction methods
and monitoring.
UNIT II SOIL WATER AND WATER FLOW 8
Soil water – Various forms – Influence of clay minerals – Capillary rise – Suction –
Effective stress concepts in soil – Total, neutral and effective stress distribution in soil –
Permeability – Darcy’s law – Permeability measurement in the laboratory – Quick sand
condition – Seepage – Laplace equation – Introduction to flow nets –Properties and uses
– Application to simple problems.
UNIT III STRESS DISTRIBUTION, COMPRESSIBILITY AND
SETTLEMENT 10
Stress distribution in soil media – Boussinesque formula – Stress due to line load and
Circular and rectangular loaded area – Approximate methods – Use of influence charts –
Westergaard equation for point load – Components of settlement – Immediate and
consolidation settlement – Terzaghi's one dimensional consolidation theory – Governing
differential equation – Laboratory consolidation test – Field consolidation curve – NC
and OC clays – Problems on final and time rate of consolidation
UNIT IV SHEAR STRENGTH 9
Shear strength of cohesive and cohesionless soils – Mohr – Coulomb failure theory –
Saturated soil and unsaturated soil (basics only) – Strength parameters – Measurement of
shear strength, direct shear, triaxial compression, unconfined compressive strength and
vane shear tests –Types of shear tests based on drainage and their applicability – Drained
and undrained behaviour of clay and sand – Stress path for conventional triaxial test.
UNIT V SLOPE STABILITY 10
Slope failure mechanisms – Modes – Infinite slopes – Finite slopes – Total and effective
stress analysis – Stability analysis for purely cohesive and c-f soils– Method of slices –
Modified Bishop’s method – Friction circle method – Stability number – Problems –
Slope protection measures.
Total: 45
TEXT BOOKS
1. Gopal Ranjan and Rao A.S.R., “Basic and Applied Soil Mechanics”, New Age
International Publishers, 2000.
2. Khan, I.H., “A Text Book of Geotechnical Engineering”, Prentice Hall of India,
1999.
REFERENCES
1. Coduto, D.P., “Geotechnical Engineering Principles and Practices”, Prentice Hall
of India Private Limited, 2002.
2. McCarthy, D.F., “Essentials of Soil Mechanics and Foundations Basic
Geotechniques”, 6th Edition, Prentice-Hall, 2002.
3. Das, B.M, “Principles of Geotechnical Engineering”, 5th Edition, Thomas Books/
Cole, 2002.


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