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Direct Sheer Stress on Sand

# Direct Sheer Stress on Sand - Direct Sheer Stress on Sand...

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Direct Sheer Stress on Sand Vanessa Barela Student ID# 900240959 Group Members: Christine Dwyer Anthony LeBaron Sarah Gonzales Phil Simmons Date of Test: March 26, 2007 Date Submitted: March 28, 2007

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Introduction The direct shear test is a test that determines the rate at which the soil will be strained is controlled. This test is very useful in engineering such as learning the properties of a soil being built on, building a retaining wall, and find the cohesion of the soil. Theory The direct shear test requires that a sample of soil is placed within a shear box and put under an applied normal load. After the load is applied, the box can be moved in two halves independently of each other. The shear test forces a failure plane to occur at the place where the halves of the boxes meet. The two forces that are acting on this are the normal stress σ and the shear stress, . τ Τηεσε τϖο στρεσσεσ λεαδ το Χουλομβ σ εθυατιον τ = c + σn tanφ [1] The unknown values are found using a Mohr’s circle, which results in a slope of a line as tan φ and the τ-axis intercept as c. To find the soils with no cohesion the equation becomes τ = σn tanφ [2] The test is performed in the United States under ASTM D 3080.
Procedure 1. The sear box assembly is removed from the direct shear machine. The load head is

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Direct Sheer Stress on Sand - Direct Sheer Stress on Sand...

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