2K6CE 506 GEOTECHNICAL ENGINEERING I

MODULE I (13 hours)
Introduction to soil Mechanics: Formation of soils. Nature of soil and functional relationships, Introduction to soil type – single grained, honey combed and flocculent structure and their effects on the basic soil properties – Introduction to clay minerology – 3-phase system – void ratio – specific gravity – dry density – porosity – water content – saturated unit weight – submerged unit weight – degree of saturation.  Laboratory and field identification of soils: determination of water content by oven drying – specific gravity using pycnometer and specific gravity bottle -grain size analysis by sieve analysis, hydrometer analysis and pipette analysis – Atterberg limits and indices – visual identification by simple field tests – field density by corecutter – sand replacement and wax coating methods. Classification of soils: necessity – principles of classification – I.S. classification – plasticity charts.
Module 11 (11hours)
Soil water: Occurrence – adsorbed and capillary water types – effective stress – total stress – pore pressure – pressure diagrams Permeability: Definition – Darcy’s law – factors affecting permeability – laboratory determination – stratified soils – average permeability. Seepage –downward and upward flow -quick sand Shear Strength: definition – Mohr-Coulomb strength theory – Measurement of shear strength – Types of Triaxial compression tests – measurement of pore pressure – total and effective stress – Unconfined Compression test – vane shear tests –Direct shear test- strength parameters – choice of test conditions for field problems.
Module I11(11 hours)
Compaction: definition and objectives of compaction – Proctor test and modified Proctor test – concept of Optimum Moisture Content and maximum dry density – zero air voids line -factors influencing compaction – effect of compaction on soil properties – field compaction methods – Proctor needle for field control Consolidation: definition – Compressibility – coefficient of volume change and compression index – Laboratory consolidation test – e-log p curves – pre-consolidation pressure – Terzaghi’s theory of one dimensional consolidation – Time rate of consolidation – difference between consolidation and compaction
Module IV (12 hours)
Stress in soil: Boussinesque’s and Westergaard’s equations for vertical loads-Pressure due to point loads and uniformly distributed loads – assumptions and limitations – pressure bulb – Newmark charts and their use – line loadsand strip loads Stability of slopes: Stability of finite slope-stability of infinite slope-Stability Number-Method of slicesThe Swedish circle method

Reference Books
1. Das,B.M ,Advanced Soil Mechanics McGraw–Hill
2.Mitchel l,J.K, Fundamnetals of Soil Behaviour John Weily and Sons
3.Lambe ,T.Wand Whitman,R.V., Soil Mechanics John Weily and Sons
4.Terzaghi ,K.,Peck,,R.B., and Mesri,G. Soil Mechanics in Engineering Practice John Weily and Sons
5.Shashi Gulhati and Manoj Dutta .,Geotechnical Enginering Tata Mc Graw-Hill
6.Gopal Ranjan and Rao,A.S.R,Basic and applied Soil Mechanics New Age International(P)Ltd