JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

Overview

Course objectives:

• 1. To Analyze the field loading conditions and predict the behavior of soil under loading and unloading condition in drained and untrained conditions of soil
• 2. To predict the probable seepage from the reservoir and for checking the stability of the structure under hydro dynamic conditions
• 3. To determine various application-based parameters of consolidation for safe design of structures on clay soils

Course Outcomes

At the end of the course, student will be able to;

• 1. Understand the behavior of soils stress paths and to determine the shear parameters under different load and drainage condition
• 2. Estimate Seepage and numerical modeling of Steady and transient flow condition
• 3. Determine Compressibility characteristics of NCC and OCC soils

UNIT - I

Geostatic Stresses & Stress Paths: Stresses within a soil mass: Concept of stress for a particulate system, Effective stress principle, Geostatic stresses, Soil water hydraulics: Principal stresses and Mohr’s circle of stress, Stress paths; At Rest earth pressure, Stress paths for different practical situations.

UNIT - II

Flow through soils: Permeability, seepage, mathematical analysis – Finite difference formulae for steady state and transient flows – flow nets – computation of seepage – uplift pressure, and critical hydraulic gradient.

UNIT - III

Compressibility and Consolidation: One dimensional compression, Oedometer test, parameters – coefficient of volume change, constrained modulus, compression index, swell or unloading, maximum past consolidation stress, Over consolidation ratio, Primary and secondary compression, consolidation -One, two- and three-dimensional problems, Consolidation of partially saturated soils, Creep/Secondary Compression in soils.

UNIT - IV

Stress-Strain-Strength Behaviour of soils: Shear strength of soils; Failure criteria, drained and undrained shear strength of soils. Significance of pore pressure parameters; Determination of shear strength; Drained, Consolidated Undrained and Undrained tests; Interpretation of triaxial test results. Behaviour of sands; Critical void ratio; dilation in soils;

UNIT - V

Critical State Soil Mechanics: Critical state parameters; Critical state for normally consolidated and over consolidated soil; Significance of Roscoe and Hvorslev state boundary surfaces; Yielding, Bounding Surfaces.

REFERENCE:

• 1. Das, B. M.- Advanced Soil Mechanics, Taylor and Francis. 7 edition (2008)
• 2. Mitchell J.K. - Fundamentals of soil behaviour - John Wiley and Sons, Inc., New York. (third edition) 2005 R19 M.TECH GEOTECHNICAL ENGG.
• 3. Craig, R. F.- Soil Mechanics, Van Nostrand Reinhold Co. Ltd. (1987)
• 4. Lambe, T. W. and Whitman, R. V.- Soil Mechanics SI version , John Wiley & Sons.(2011) Muniram Budhu.- Soil Mechanics and Foundations, John Wiley & Sons, Inc.(2007)
• 5. Atkinson J. H. - An Introduction to the Mechanics of Soils and Foundation - through critical state soil mechanics, McGraw- Hill Co. (1993)
• 6. Wood, D.M.- Soil Behavior and Critical State Soil Mechanics. Cambridge university press (1991) R19 M.TECH GEOTECHNICAL ENGG. M.TECH.- I YEAR- I SEMESTER GEOTECHNICAL ENGINEERING