A fully saturated cylindrical triaxial sample of clay soil has initial dimensions of 38mm in diameter by 76mm long. A quick undrained triaxial test is conducted on the specimen where the cell pressure is 200 kN/m2. In this the deviator stress at failure is 78 kN/m2. What is the undrained strength of the soil?

A fully saturated cylindrical triaxial sample of clay soil has initial dimensions of 38mm in diameter by 76mm long. A quick undrained triaxial test is conducted on the specimen where the cell pressure is 200 kN/m2. In this the deviator stress at failure is 78 kN/m2. What is the undrained strength of the soil?

Fundamentals of Geotechnical Engineering (MindTap Course List)

5th Edition

ISBN:9781305635180

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter10: Shear Strength Of Soil

Section: Chapter Questions

Problem 10.9P

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Test for Determination of Shear Strength

The term shear strength is often associated with the soil. Shear strength is defined as the resistance to the deformation of soil particles due to the continuous action of shear stress. In short, shear strength is the maximum shear stress that a soil can sustain.

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A fully saturated cylindrical triaxial sample of clay soil has initial dimensions of 38mm in diameter by 76mm long. A quick undrained triaxial test is conducted on the specimen where the cell pressure is 200 kN/m². In this the deviator stress at failure is 78 kN/m².

What is the undrained strength of the soil?

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A fully saturated cylindrical triaxial sample of clay soil has initial dimensions of 38mm in diameter by 76mm long. A quick undrained triaxial test is conducted on the specimen where the cell pressure is 200 kN/m2. In this the deviator stress at failure is 78 kN/m2. After the triaxial test, a water content test is conducted on the entire sample. The combined weight of the wet sample and sample container was 183.3 g. The combined weight of the oven dried sample and sample container was 149.4 g. The sample containerweighs 10.9 g. The soil solids specific gravity is 2.65. Note: If it is appropriate you may assume that g=10 m/s2 and thus that gw=10 kN/m3. What is the undrained strength of the soil? Also, what are the water content of the soil, its total (or bulk) unit weight, and its voids ratio?
c. An undisturbed soil sample, 110 mm in diameter and 220 mm in height, was tested in a triaxial machine. The sample sheared under an additional axial load of 3.35 kN with a vertical deformation of 21 mm. The failure plane was inclined at 50° to the horizontal and the cell pressure was 300 kN/m². i. Draw the Mohr circle diagram representing the above stress conditions, and from it determine: - Coulomb's equation for the shear strength of the soil, in terms of total stress; - the magnitude and obliquity of the resultant stress on the failure plane. ii. A further undisturbed sample of the soil was tested in a shear box under the same drainage conditions as used for the previous test. If the area of the box was 3600 mm² and the normal load was 500 N, what would you expect the failure stress to have been?
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