It is desired to obtain information about the in situ strength properties, c and f, for a saturated clay soil, and also the preconsolidation pressure. Direct shear tests under consolidated–undrained conditions are performed on three identical samples of the clay. For sample one, the applied normal pressure is 30 kPa and the sample fails when the shear stress is 19 kPa; for sample two, the applied normal stress is 70 kPa and the sample shears at 28 kPa; for sample three, the applied normal pressure is 120kPa and the sample shears at 45 kPa. From these data, estimate the values of the in situ cohesion c and fCU, and the preconsolidation stress svc.

It is desired to obtain information about the in situ strength properties, c and f, for a saturated clay soil, and also the preconsolidation pressure. Direct shear tests under consolidated–undrained conditions are performed on three identical samples of the clay. For sample one, the applied normal pressure is 30 kPa and the sample fails when the shear stress is 19 kPa; for sample two, the applied normal stress is 70 kPa and the sample shears at 28 kPa; for sample three, the applied normal pressure is 120kPa and the sample shears at 45 kPa. From these data, estimate the values of the in situ cohesion c and fCU, and the preconsolidation stress svc.

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 12.7P

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It is desired to obtain information about the in-situ strength properties cohesion and angle of friction for a saturated soil and also the pre-consolidation pressure. Direct shear tests under consolidated undrained conditions are performed on three identical samples of clay. For sample one, the applied normal pressure is 36 kPa and the sample fails when the sheer stress is 21.6 kPa, for sample two, the applied normal stress is 72 kPa and the sample shear stress is 24 kPa, for sample three, the applied normal pressure is 120 kPa and the sample shears at 38.4 kPa. Compute the value of the pre-consolidation stress. a.192.8 b.62.5 c.21.6 d.372.8 With Free Body Diagram
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