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Note for Geotechnical Engineering - 2 - GTE-2 by Vssut Rulers

• Geotechnical Engineering - 2 - GTE-2
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• Veer Surendra Sai University Of Technology VSSUT -
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LECTURE NOTE COURE CODE BCE402 GEOTECHNICAL ENGINEERING – II *Under revision

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BCE402- Syllabus Module – I (10 Hours) Stress distribution in soil: Boussinesq equations, Stress isobar and pressure bulb concept, pressure distribution on horizontal and vertical planes, stresses due to point load, line load, strip load, uniformly loaded circular and rectangular areas. Use of newmark‟s chart. Westergaard‟s solution. Approximate methods (point load method, two-to-one load distribution method). Contact pressure distribution due to loaded areas. Concept of active zone. Module –II (10 Hours) Lateral earth pressure and retaining structures: Earth pressure at rest, active and passive earth pressure. Earth pressure theories, Rankine‟s theory, Coloumb‟s wedge theory, Rebhann‟s and Culmann‟s graphcal methods, stability conditions for retaining walls. Stability of earth slopes: Stability of infinite slopes, stability analysis of finite slopes, Swedish method of slices, fiction circle method, Bishop‟s method. Use of Taylor stability number. Fellnious metod for locating centre of critical slip circle. Module – III (10 Hours) Subsoil exploration: Methods, direct (test pits, trenches), semi-direct (borings), indirect (sounding, penetration tests, and geophysical methods). Planning of exploration programme, spacing and depth of boring, soil sampling, types of samples, standard penetration test, static and dynamic cone penetration test, in-situ vane shear test. Seismic refraction method, electrical resistivity methods, Module-IV (10 Hours) Shallow foundation: Introduction, bearing capacity, methods and determination of bearing capacity, settlement of foundations. Deep foundation: Classification of pile, pile driving methods, pile capacity (static and dynamic analysis) pile-group analysis, load test on piles. Reference Books: 1. Geotechnical Engineering, C. Venkatramaiah, New Age International publishers. 2. Geotechnical Engineering, T.N. Ramamurthy & T.G. Sitharam, S. Chand & Co. 3. Soil Mechanics, T.W. Lambe & Whiteman, Wiley Eastern Ltd, Nw Delhi. 4. Foundation Engineering, P.C. Verghese, Prentice Hall of India. *Under revision

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Disclaimer This document does not claim any originality and cannot be used as a substitute for prescribed textbooks. The information presented here is merely a collection by the committee members for their respective teaching assignments. We would like to acknowledge various sources like freely available materials from internet from which the lecture note was prepared. The ownership of the information lies with the respective authors or institutions. Further, this document is not intended to be used for commercial purpose and the committee members are not accountable for any issues , legal or otherwise, arising out of use of this document. The committee members make no representations or warranties with respect to the accuracy or completeness of the contents of this document and specifically disclaim any implied warranties of merchantability or fitness for a particular purpose. *Under revision

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LECTURE 1 STRESS DISTRIBUTION IN SOIL Fig. 1.1 Stress in soil is caused by the first or both of the following :(a) Self weight of Soil. (b) Structural loads, applied at or below the surface. The estimation of vertical stresses at any point in a soil mass due to external loading is essential to the prediction of settlements of buildings, bridges and pressure. The stresses induced in a soil due to applied loads depend upon its Stress – Strain characteristics. The stress strain behaviour of soils is extremely complex and it depend upon a large number of factors, such as drainage conditions, water content, void ratio, rate of loading, the load level, and the stress path. However simplifying assumptions are generally made in the analysis of soil behaviour to obtain stresses. It is generally assumed that the soil mass is homogeneous and isotropic. The stress strain relationship is assumed to be linear. The theory of elasticity is used to determine the stresses in the soil mass. Though it involves considerable simplification of real soil behaviour and the stresses computed are approximate, the results are good enough for soil problems usually encountered in the practice. Geostatic stress: Stresses due to self weight are known as geostatic stresses. *Under revision