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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:

  1. 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. Gene-Tek Books, New Delhi. 

  2. 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, grain-size distribution of soil, weight–volume  relationships, relative density and relative compaction, effect of roundness  and non-plastic  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 three-dimensional 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 three-dimensional case , strain components on an inclined plane, principal  strain three-dimensional 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 semi-infinite mass, horizontal line load on the surface, horizontal line load inside a semi-infinite mass, uniform  vertical loading  on an infinite strip on the surface, uniform  strip load inside a semi-infinite 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 semi-infinite 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 one-dimensional 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, Electro-osmosis, 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 non-homogeneous 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 one-dimensional consolidation, degree of consolidation under  time-dependent loading, numerical  solution  for one-dimensional consolidation, standard one-dimensional consolidation test and interpretation, effect of sample disturbance, secondary consolidation, general  comments  on consolidation tests, calculation of one-dimensional consolidation settlement, coefficient of consolidation, one-dimensional consolidation with visco-elastic models, constant rate-of-strain consolidation tests, constant-gradient 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, One-dimensional primary  consolidation settlement  calculation, Skempton–Bjerrum modification for calculation of consolidation settlement, settlement of over-consolidated clays, settlement calculation using stress path, comparison of primary  consolidation settlement  calculation, secondary consolidation settlement, pre-compression for improving  foundation soils. 7 hours

Lecture notes, homework and presentations, links will appear to click after lecture day.

  1. 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.

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