Soil Mechanics -PCCET402 → Shear strength , Consolidation

Curriculum

4 Sections
4 Lessons
15 Weeks

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Module 1
Nature of soil and functional relationships : Introduction to geotechnical engineering– Soil types – Major soil deposits of India - 3 phase system – Basic soil properties : Void ratio, porosity, degree of saturation, air content, water content, specific gravity, unit weight - Relationship between basic soil properties, Relative Density- Numerical problems. Determination of Water content by oven drying, Specific gravity using pycnometer & specific gravity bottle - Determination of Field density by sand replacement method and Core Cutter method - Numerical problems. Soil Structure and their effects on the basic soil properties –Basic structural units of clay minerals (introduction only)
1
- 1.1
  Nature of soils and functional relationships
  28 Minutes
Module 2
Index properties: Sieve analysis, Hydrometer analysis-strokes law, calibration of hydrometer, corrections to hydrometer readings, gradation of soil, combined sieve and hydrometer analysis, limitations, [no derivation required for percentage finer and diameter]. Consistency – Atterberg Limits and indices – Plasticity charts – activity of soil-laboratory tests for Liquid Limit (Casagrande’s apparatus and cone penetrometer), Plastic Limit and Shrinkage Limit - Numerical problems IS classification of soil . Permeability of soils : Darcy’s law – Factors affecting permeability – Laboratory tests: Constant head and variable head permeability tests - Average permeability of stratified deposits - Numerical problems
1
- 2.1
  Index properties of soil
Module 3
Principle of effective stress - Total, neutral and effective stress – Pressure diagrams in layered soil with water table, saturated by capillary action, subjected to surcharge load – Numerical problems- Quick sand condition – Critical hydraulic gradient Stress distribution : Introduction - Boussinesq’s equations for vertical pressure due to point loads and line loads – Assumptions and Limitations - Numerical problems - Vertical pressure due to uniformly distributed loads beneath strip, circular [no derivation required] - Numerical problems. Vertical pressure due to loading on rectangular area and Fadum’s chart (Brief description only) Approximate methods for vertical stress: Equivalent Point Load method & 2:1 Distribution Method - Numerical problems - Pressure Isobars - Pressure bulbs. distribution of contact pressure beneath footings : Compaction Tests – OMC and MDD, Zero Air voids line, IS Light & Heavy- Factors affecting compaction-Numerical problems - Field compaction methods-compaction control –Proctor needle.
1
- 3.1
  Compaction, Principle of effective stress, Stress distribution
Module 4
Consolidation - Definition – Concepts of Coefficient of compressibility and volume compressibility - e-log p curve - Compression index, Recompression index and Pre-consolidation Pressure - Normally consolidated, over consolidated and under consolidated soils - Terzaghi’s theory of onedimensional consolidation with its assumptions (no derivation required) - average degree of consolidation – Time factor - Coefficient of consolidation - Numerical problems - Laboratory consolidation test – Determination of Coefficient of Consolidation - Difference between consolidation and compaction . Shear strength of soils- Practical Applications - Mohr-Coulomb failure criterion - Mohr circle method for determination of principal planes and 10 stresses– relationship between shear parameters and principal stresses - Numerical problems - Brief discussion of Laboratory tests - Triaxial compression test - UU, CU and CD tests - Total and effective stress strength parameters - Unconfined compression test, Direct shear test and vane shear test
1
- 4.1
  Shear strength , Consolidation

Soil Mechanics -PCCET402

Curriculum

Shear strength , Consolidation

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