7. A specimen of soil was collected from a depth of 10 m in a deposit of clay. The ground water table coincides with the ground surface. For the soil, LL = 65, PL = 33, and sat = 17.5kN/m³. Estimate the undrained shear strength Su of this clay for the following cases. (a) If the clay is normally consolidated. (b) If the preconsolidation pressure is 210kN/m². (refer to Skempton's and Ladd et al.'s relations and Bjerrum's correction for undrained shear strength)

7. A specimen of soil was collected from a depth of 10 m in a deposit of clay. The ground water table coincides with the ground surface. For the soil, LL = 65, PL = 33, and sat = 17.5kN/m³. Estimate the undrained shear strength Su of this clay for the following cases. (a) If the clay is normally consolidated. (b) If the preconsolidation pressure is 210kN/m². (refer to Skempton's and Ladd et al.'s relations and Bjerrum's correction for undrained shear strength)

Principles of Geotechnical Engineering (MindTap Course List)

9th Edition

ISBN:9781305970939

Author:Braja M. Das, Khaled Sobhan

Publisher:Braja M. Das, Khaled Sobhan

Chapter12: Shear Strength Of Soil

Section: Chapter Questions

Problem 12.24P

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Concept explainers

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.

Question

7. A specimen of soil was collected from a depth of 10 m in a deposit of clay. The ground water table
coincides with the ground surface. For the soil, LL = 65, PL = 33, and at 17.5kN/m³. Estimate the
undrained shear strength Su of this clay for the following cases
(a) If the clay is normally consolidated.
(b) If the preconsolidation pressure is 210kN/m².
(refer to Skempton's and Ladd et al.'s relations and Bjerrum's correction for undrained shear
strength)

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The following results were obtained at failure in a series of drained triaxial tests on fully saturated clay specimens originally 38 mm diameter by 76 mm long. All-round pressure (kN/m2) Axial compression (mm) Axial load (N) Pore-water pressure (kN/m2) 200 400 600 7.22 8.36 9.41 480 895 1300 25 75 100 (a) Determine the values of the shear strength parameters c and . (b) Determine the values of the shear strength parameters c and . (c) A different specimen of the same soil is tested in undrained triaxial compression at a cell pressure of 240 kN/m2 and fails when the deviator stress is 160 kN/m2. Calculate the pore water pressure in the specimen at failure.
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