Soil Mechanics

E3404

SOIL MECHANICS

COURSE OBJECTIVES

• To impart knowledge to classify the soil based on index properties and to assess their engineering properties based on the classification. To familiarize the students about the fundamental concepts of compaction, flow through soil, stress transformation, stress distribution, consolidation and shear strength of soils. To impart knowledge of design of both finite and infinite slopes.

UNIT I

SOIL CLASSIFICATION AND COMPACTION

Formation of soil - Soil description - Particle - Size shape and colour - Composition of gravel, sand, silt, clay particles - Particle behaviour - Soil structure - Phase relationship - Index properties - Significance BIS classification system - Unified classification system - Compaction of soils - Theory, Laboratory and field tests - Field Compaction methods - Factors influencing compaction of soils.

UNIT II

EFFECTIVE STRESS AND PERMEABILITY

Soil-water - Static pressure in water - Effective stress concepts in soils - Capillary phenomena- Permeability interaction Hydraulic conductivity Darcy's law Determination of Hydraulic Conductivity Laboratory Determination (Constant head and falling head methods) and field measurement pumping out in unconfined and confined aquifer - Factors influencing permeability of soils - Seepage - Two dimensional flow - Laplace's equation - Introduction to flow nets - Simple problems. (Sheet pile and weir).

UNIT III

STRESS DISTRIBUTION AND SETTLEMENT

Stress distribution in homogeneous and isotropic medium - Boussinesq theory (Point land, Line land and udl) Use of New marks influence chart -Components of settlement Immediate and consolidation settlement - Terzaghi's one dimensional consolidation theory - Computation of rate of settlement. Vt and log t methods- e-log p relationship.

UNIT IV

SHEAR STRENGTH

Shear strength of cohesive and cohesion less soils - Mohr-Coulomb failure theory - Measurement of shear strength - Direct shear, Triaxial compression, UCC and Vane shear tests - Pore pressure parameters - Cyclic mobility - Liquefaction.

UNIT V

SLOPE STABILITY

Stability Analysis - Infinite slopes and finite slopes - Total stress analysis for saturated clay - Friction circle method - Use of stability number - Method of slices - Fellenious and Bishop's method - Slope protection measures.

TOTAL: 45 PERIODS

COURSE OUTCOMES:

On completion of the course, the student is expected to be able to

CO1 Demonstrate an ability to identify various types of soils and its properties, formulate and solve engineering Problems

CO2 show the basic understanding of flow through soil medium and its impact of engineering solution

CO3 Understand the basic concept of stress distribution in loaded soil medium and soil settlement due to consolidation

CO4 Show the understanding of shear strength of soils and its impact of engineering solutions to the loaded soil medium and also will be aware of contemporary issues on shear strength of soils.

CO5 Demonstrate an ability to design both finite and infinite slopes, component and process as per needs and specifications.

TEXTBOOKS:

1. Murthy, V.N.S., "Soil Mechanics and Foundation Engineering", CBS Publishers Distribution Ltd., New Delhi. 2015

2. Gopal Ranjan and Rao, A.S.R., "Basic and Applied Soil Mechanics", New Age Ltd. International Publisher New Delhi (India) 2006.

REFERENCES:

1. McCarthy, D.F., "Essentials of Soil Mechanics and Foundations". Prentice-Hall, 2006.

2. Coduto, D.P., "Geotechnical Engineering - Principles and Practices", Prentice Hall of India Pvt.Ltd. New Delhi, 2010. Gotechnical Engracing. Books / Coles, The /

3. Das, B.M., "Principles of Geotechnical Engineering". Brooks/Coles / Thompson Learning Singapore, 8th Edition, 2013.