Soil Mechanics Course

Lesson 1 • Soil Mineralogy and Particle Structure

Examines clay minerals, silt, sand, and gravel at the particle level. Mineral type directly controls plasticity, swelling, and strength behaviour.

Lesson 2 • Phase Relationships and Index Properties

Defines void ratio, porosity, degree of saturation, and unit weight. These index properties are the quantitative foundation for all subsequent analyses.

Lesson 3 • Origin and Formation of Soils

Covers weathering processes and soil formation from parent rock. Connects geological origin to engineering properties encountered in practice.

Lesson 1 • Principles of Soil Compaction

Explains how mechanical energy expels air voids to increase dry density. Moisture-density relationships form the basis for compaction control.

Lesson 2 • Field Density Testing and Acceptance

Presents nuclear gauge, sand cone, and drive-cylinder methods for in-place density. Acceptance criteria link field measurements to laboratory Proctor results.

Lesson 3 • Field Compaction Equipment and Methods

Surveys roller types, lift thickness, and pass requirements for various soil types. Equipment selection directly affects compaction efficiency and uniformity.

Lesson 1 • Darcy's Law and Hydraulic Conductivity

Introduces Darcy's law relating flow velocity to hydraulic gradient. Hydraulic conductivity is the key material parameter controlling seepage behaviour.

Lesson 2 • Flow Nets and Seepage Analysis

Develops graphical flow net construction for two-dimensional seepage problems. Flow nets quantify seepage quantity and pore pressure distribution.

Lesson 3 • Piping, Heave, and Internal Erosion

Examines critical hydraulic gradient, piping failure, and heave in excavations. Understanding these limits is essential for safe design of dams and retaining structures.

Lesson 1 • Geostatic Stresses and Effective Stress

Defines total stress, pore-water pressure, and effective stress using Terzaghi's principle. Effective stress controls soil strength and compressibility.

Lesson 2 • Stress Paths and Mohr Circle Analysis

Uses Mohr circles to visualise stress states and track stress path changes during loading. Stress path analysis links laboratory tests to field loading conditions.

Lesson 3 • Stress Increase from Surface Loads

Applies Boussinesq and Westergaard solutions to compute stress increments below foundations. Accurate stress distribution is prerequisite to settlement prediction.

Lesson 1 • Consolidation Theory and Oedometer Test

Presents Terzaghi's one-dimensional consolidation theory and the oedometer test procedure. The test yields compressibility parameters used in all settlement calculations.

Lesson 2 • Field Monitoring and Preloading Methods

Covers settlement monitoring instruments and preloading as a ground improvement strategy. Field data validate design predictions and guide construction decisions.

Lesson 3 • Settlement Magnitude Calculations

Calculates immediate, primary consolidation, and secondary compression settlements. Each component requires different parameters and governs different soil types.

Lesson 1 • Strength of Granular and Cohesive Soils

Contrasts drained strength behaviour of sands with drained and undrained behaviour of clays. Correct parameter selection prevents unconservative design.

Lesson 2 • Pore Pressure Parameters and Undrained Behaviour

Introduces Skempton's pore pressure parameters A and B to relate total stress changes to pore pressure. Undrained strength governs short-term stability of saturated clays.

Lesson 3 • Mohr-Coulomb Failure Criterion

Defines cohesion and friction angle as the two components of shear strength. The Mohr-Coulomb envelope is the universal failure criterion in soil mechanics.

Lesson 1 • Limit Equilibrium Methods

Applies the method of slices, Bishop's simplified method, and Janbu's method to circular and non-circular surfaces. Each method balances different equilibrium conditions.

Lesson 2 • Effect of Pore Pressure on Stability

Incorporates pore pressure ratio and flow net data into slope stability calculations. Pore pressure is the dominant variable in many slope failures.

Lesson 3 • Failure Mechanisms and Slope Geometry

Classifies slope failure types and identifies geometric and material factors controlling instability. Understanding failure modes guides selection of the appropriate analysis method.

Lesson 1 • Settlement Analysis for Shallow Foundations

Combines elastic and consolidation settlement methods to predict total foundation movement. Settlement often controls design before bearing capacity is reached.

Lesson 2 • Deep Foundation Types and Behaviour

Surveys driven piles, drilled shafts, and micropiles and their load transfer mechanisms. Deep foundations transfer load to competent strata beyond weak near-surface soils.

Lesson 3 • Retaining Wall Design and Earth Pressure

Designs gravity, cantilever, and anchored retaining walls using active and passive earth pressures. Stability checks include sliding, overturning, and bearing capacity.

Lesson 4 • Pile Capacity Estimation Methods

Applies static analysis, dynamic formulas, and load testing to estimate pile capacity. Multiple methods are used together to reduce uncertainty in design.