Tension Report

In: Science

Submitted By yuguoyue
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Pages 9
Shear Box Report
Abstract
This repot describes the Shear Box test based on two types of soil that are loose soil and dense soil. The test has shown that the use of dry river sand under different densities to underestimate the shear strength parameters, the soil cohesion and the angle of friction with regard to the relationship between soil density and shear strength.

Introduction
The aim of the Shear box test was to determine the shear strength of sand using the shear box teat, and to investigate the effect of soil density on the strength.
The shear strength of a soil is its resistance to shearing stresses. It is a measure of the soil resistance to deformation by continuous displacement of its individual soil particles. To investigate more about the behavior of the soil, a Mohr-coulomb theory has been introduced. This theory states that a material fails because of a critical combination of normal stress and shear stress, and not from their either maximum normal or shear stress alone. the limiting shear stress( the shear strength, t) that may be applied to any plane in the soil mass is found to be given by an equation of the form:

τ = c + σ tan(φ) where σ = normal stress on the failure plane φ = angle of friction c = (apparent) cohesion
The parameters C and φ are not generally soil constants. They also depended on the use of total or effective stresses.
In terms of effective stress the failure criterion is written: τ = σ' tan(φ') + c' where σ' is effective stress. And σ' = (σ - u), σ is the total stress applied vertical to the shear plane; u is the pore water pressure acting on the same plane. c' and σ' are referred to as the effective (drained) strength parameters.
This repot describes the Shear Box test based on two types of soil that are loose soil and dense soil. The results are used to determine the relationship…...

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