Soil Mechanics
Welcome to lecture note page of Soil Mechanics. I teach Soil Mechanics in MSc Engineering Geology 2nd semester at Central Department of Geology, Kirtipur, Kathmandu. You can download pdf files of lecture notes and presentations of class lectures from this page. Assignments are also given in the end of the lecture notes. Click the links below to download lecture notes.
Class days: Every week Sunday and Wednesday
Time: 07.30  09.30for Sunday and 08.30  09.30 for Wednesday
Main text and reference books:

Textbooks
Braja M. Das (2009) Advanced Soil Mechanics, Third edition, Taylor and Francis: New York, London. 592 p.
Lambe T. W. and Whiteman R. V. (2000). Soil Mechanics, SI Version, John Wiley & Sons.
Reddy, R. N. (2010). (ed.): Soil Engineering Testing, Design and Remediation. GeneTek Books, New Delhi.

Reference Books
Arora. K.R. (2011). Soil Mechanics and Foundation Engineering. Standard Publishers Distributors. Delhi, India. 886p.
Lambe T. W. and Whiteman R. V. (1969). Soil Mechanics, John Wiley & Sons 553 p.
COURSE CONTENT
Soil, plasticity, and classification. Introduction, soil size limits, clay, nature of water in clay, repulsive potential, repulsive pressure, flocculation and dispersion of clay particles, consistency of cohesive soils, liquidity index, activity, grainsize distribution of soil, weight–volume relationships, relative density and relative compaction, effect of roundness and nonplastic fines, unified soil classification system. 4 hours
Stresses and strains. Introduction, Basic definition and sign conventions for stresses, Equations of static equilibrium, Concept of strain, Hooke’s law, plane strain problems; equations of compatibility for threedimensional problems, stresses on an inclined plane and principal stresses for plane strain problems, strains on an inclined plane and principal strain for plane strain problems, stress components on an inclined plane, principal stress, and octahedral stresses threedimensional case , strain components on an inclined plane, principal strain threedimensional case. 5 hours
Stresses and displacements in a soil mass. Introduction, vertical line load on the surface vertical line load on the surface of a finite layer, vertical line load inside a semiinfinite mass, horizontal line load on the surface, horizontal line load inside a semiinfinite mass, uniform vertical loading on an infinite strip on the surface, uniform strip load inside a semiinfinite mass, uniform horizontal loading on an infinite strip on the surface, triangular normal loading on an infinite strip on the surface, vertical stress in a semiinfinite mass due to embankment loading. 5 hours
Pore water pressure due to undrained loading. Introduction, pore water pressure developed due to isotropic stress application, pore water pressure parameter, pore water pressure due to uniaxial loading, directional variation, pore water pressure under triaxial test conditions, Henkel’s modification of pore water pressure equation, pore water pressure due to onedimensional strain loading. 4 hours
Permeability and seepage. Introduction, Darcy’s law, Validity of Darcy’s law, Determination of coefficient of permeability in the laboratory, Variation of coefficient of permeability for granular soils, Variation of coefficient of permeability for cohesive soils, Directional variation of permeability in anisotropic medium, Effective coefficient of permeability for stratified soils, Determination of coefficient of permeability in the field, Factors affecting the coefficient of permeability, Electroosmosis, Seepage equation of continuity; Use of continuity equation for solution of simple flow problem, flow nets, Hydraulic uplift force under a structure, Flow nets in anisotropic material, Construction of flow nets for hydraulic structures on nonhomogeneous subsoils, numerical analysis of seepage, seepage force per unit volume of soil mass, safety of hydraulic structures against piping, filter design, calculation of seepage through an earth dam resting on an impervious base, plotting of phreatic line for seepage through earth dams, entrance, discharge, and transfer conditions of line of seepage, through earth dams and flow net, construction for earth dams. 10 hours
Consolidation Introduction, theory of onedimensional consolidation, degree of consolidation under timedependent loading, numerical solution for onedimensional consolidation, standard onedimensional consolidation test and interpretation, effect of sample disturbance, secondary consolidation, general comments on consolidation tests, calculation of onedimensional consolidation settlement, coefficient of consolidation, onedimensional consolidation with viscoelastic models, constant rateofstrain consolidation tests, constantgradient consolidation test, sand drains, numerical solution for radial drainage (sand drain) general comments on sand drain problems. 5 hours
Shear strength of soils. Introduction, Mohr–Coulomb failure criteria, shearing strength of granular soils, critical void ratio, curvature of the failure envelope, general comments on the friction angle of granular soils, shear strength of granular soils under plane strain condition, shear strength of cohesive soils, unconfined compression test, modulus of elasticity and Poisson’s ratio from triaxial tests, friction angles, effect of rate of strain on the undrained shear strength, effect of temperature on the undrained shear strength, stress path, Hvorslev’s parameters, relations between moisture content, effective stress, and strength for clay soils, correlations for effective stress friction angle, anisotropy in undrained shear strength, sensitivity and thixotropic characteristics of clays, Vane shear test, relation of undrained shear strength and effective overburden pressure, creep in soils. 10 hours
Settlement of shallow foundations. Introduction, elastic settlement, modulus of elasticity and Poisson’s ratio, settlement based on theory of elasticity, generalized average elastic settlement equation, improved equation for elastic settlement, calculation of elastic settlement in granular soil using simplified, strain influence factor, consolidation settlement, Onedimensional primary consolidation settlement calculation, Skempton–Bjerrum modification for calculation of consolidation settlement, settlement of overconsolidated clays, settlement calculation using stress path, comparison of primary consolidation settlement calculation, secondary consolidation settlement, precompression for improving foundation soils. 7 hours
Lecture notes, homework and presentations, links will appear to click after lecture day.
 Lecture 1 Introduction, soil size limits, clay, nature of water in clay, pdf of Class ppt: click here
You should submit Homework of this lecture on next class. Please check last slide of the presentation.
2. Lecture 2 Soil Mechanics 2, pdf of Class ppt: click here
You should submit Homework of this lecture on next class. Please check last slide of the presentation.
3. Lecture 3 Activity and Grain Size Distribution, pdf of Class ppt: click here
You should submit Homework of this lecture on next class. Please check last slide of the presentation.
4. Lecture 4 Soil Classification, pdf of Class ppt: click here
You should submit Homework of this lecture on next class. Please check last slide of the presentation.