How the significance of effective stress and drainage during shearing can be explained?

Construction Materials, Methods and Techniques (MindTap Course List)
4th Edition
ISBN:9781305086272
Author:William P. Spence, Eva Kultermann
Publisher:William P. Spence, Eva Kultermann
Chapter8: Cast-in-place Concrete
Section: Chapter Questions
Problem 21RQ
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How the significance of effective stress and drainage during shearing can be explained?

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Step 1 Shearing:

Shear strength is the capacity to resist shear stress. If the value of shear stress on any plane or a surface at any point equals or exceeds the value of shear strength, failure will occur in the soil mass because of the movement of a portion of soil mass along that particular plane and the soil will be said to have failed in shear.

Nearly, all geotechnical strength analysis evaluate shear strength because whatever be the nature of loads, failure always occur by shearing, and it never occurs by crushing of particles.

Shear strength of soil is given b y the equation:

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