2. The following laboratory data are available on the drained shear strength of a highly overconsolidated stiff clay at an effective normal stress range near 100 kPa: peak strength, c' = 10 kPa, o' = 22°; fully softened strength, c' = 0, o' = 21°; residual strength, c' = 0, 6; = 12°. Factor of safety for slope stability analysis is defined as F.S. (mobilized shear strength)/(shear stress). For one segment of a slip surface in a slope, the effective normal stress is 100 kPa and the factor of safety (for the segment) with respeet to peak strength is 1.7 %3D %3D %3!

2. The following laboratory data are available on the drained shear strength of a highly overconsolidated stiff clay at an effective normal stress range near 100 kPa: peak strength, c' = 10 kPa, o' = 22°; fully softened strength, c' = 0, o' = 21°; residual strength, c' = 0, 6; = 12°. Factor of safety for slope stability analysis is defined as F.S. (mobilized shear strength)/(shear stress). For one segment of a slip surface in a slope, the effective normal stress is 100 kPa and the factor of safety (for the segment) with respeet to peak strength is 1.7 %3D %3D %3!

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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2. Major and minor total principal stresses acting on a soil element are 348kPa and 160kPa respectively. And the pore water pressure (u) at this element is 96kPa. From previous laboratory tests you know that this soil has c'=12kPa and '-32°. Draw the effective stress failure envelope. total stress Mohr's circle, effective stress Mohr's circle and determine if a shear failure will occur for that soil element under the given stress conditions.
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A standard specimen of cohesionless sand was tested in triaxial compression test and the sample field at a deviator stress of 450 KN/ sq-m, when the cell pressure was 100 kN/sq-m under drained condition. Find the effective angle of shearing resistance of sand. what would be the deviator stress and the Major principle stress at the failure of another identical specimen of sand if it is tested under a cell pressure of 200 KN/ sq-m ?
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6. ( A silty sand sample failed during a consolidated-undrained triaxial test at o,=280 kPa and 0,=170 kPa. With the assumption that c=0 and A=0.65, determine the consolidated-undrained friction angle de and a drained friction angle o. If a consolidated-undrained test on such a soil is conducted at a confining pressure o,=340 kPa, what will be major total and effective stresses and the pore water pressure at failure? What will be the maximum shear stress t during a "slow" direct shear test, if the vertical stress o,=160 kPa? cu - 141° $' = 21.0° %3D 560 kpQ 417 197 RPa T = G1.4 RPa
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Subject :Geotechnical Engineering