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 o 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° O,- 560 kpQ 417 RPe %3D 197 RPa T = G1.4 RPa

Principles of Geotechnical Engineering (MindTap Course List)
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Chapter12: Shear Strength Of Soil
Section: Chapter Questions
Problem 12.14P: Following are the results of consolidated-undrained triaxial tests on undisturbed soils retrieved...
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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
Transcribed Image Text: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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