Soil formation - Major soil deposits of India - Basic soil properties - Weight-volume relationships - Void ratio, porosity, degree of saturation, air content, percentage air voids, moisture content, specific gravity, bulk, saturated and submerged unit weights - Relationship between basic soil propertiesIndex properties - Sieve analysis – Well graded, poorly graded and gap graded soils - Stoke's law - Hydrometer analysis – Relative density – Consistency - Atterberg Limits - Practical Applications - Field identification of soils - I.S. classification of soilsCompaction of soils - Standard Proctor, Modified Proctor, I.S. light & Heavy Compaction Tests – OMC -Zero Air voids line - Control of compaction - Field methods of compaction[Brief discussion only].
Permeability of soils - Darcy's law – Factors affecting permeability - Constant head and falling head permeability tests - Average permeability of stratified deposits Principle of effective stress- Total , neutral and effective stress variation diagrams - Quick sand condition - Critical hydraulic gradient - Estimation of quantity of seepage using flow nets[only for the case of seepage around a single row of sheet piles] – Definition of phreatic line and exit gradient.
Compressibility and Consolidation - Void ratio versus pressure relationship - Coefficient of compressibility and volume
compressibility – Compression index - Change in void ratio method - Height of solids method - Normally consolidated, under consolidated and over consolidated states - Estimation of pre consolidation
pressure - Estimation of magnitude of settlement of normally consolidated clays – Terzaghi's theory of one-dimensional consolidation(no derivation required) - average degree of consolidation – Time factor - Coefficient of consolidation - Square root of time & logarithm of time fitting methods-
Shear strength of soils - Mohr's circle - Mohr-Coulomb failure criterion - Direct shear test, triaxial compression test, vane shear test, unconfined compression test - Merits and drawbacks of the tests - UU and CD tests[Brief discussion only] - Sensitivity - Thixotropy - Liquefaction - Critical void ratioStability of finite slopes - Toe failure, base failure, slip failure - Swedish Circle Method – Friction circle method – Factor of safety with respect to cohesion and angle of internal friction - Stability number - Stability charts - Methods to improve slope stability
Duration: 3 hours
The question paper consists of Part A and Part B.
Part A carries 40 marks. There will be 8 compulsory short answer questions covering entire syllabus.
Part B is for 60 marks. There will be 2 questions from each module. The candidate has to answer one question of 20 marks from each module.
Note: No other charts, tables, codes are permitted in the Examination hall .If necessary relevant data shall be given along with the question paper by the question paper setter