Unit 1
Environmental cycles – Soil and water – Environmental interaction relating to geotechnical problems – Effect of pollution on soil – water behaviour.
Origin, nature and distribution of soil – Description of individual particle – Soil fabric and structure – Gravitational and surface forces – Intersheet and interlayer bonding in the clay minerals – Basic structural units of clay minerals – Isomorphous substitution – Kaolinite mineral – Montmorillonite mineral – Illite mineral – Electric charges on clay minerals – Ion exchange capacity – Diffused double layer – Adsorbed water – Soil structure – Methods for the identification of minerals (introduction only).
Effect of drying on Atterberg limits – Shrinkage, swelling and cracking characteristics of soil – Electrochemical characteristics of soil-water system – Sensitivity of soil to environment – Soil-water-air interaction – Activity, sensitivity, causes of sensitivity – Influence of exchangeable cations, pH and organic matter on properties of soils – Permeability of soils – Hydraulic conductivity of different types of soils – Darcy’ s law and its validity – Factors affecting permeability