Based on undrained triaxial tests of a clay with pore pressure measurement, the material is found to have a CD cohesion of 25 kPa and corresponding effective friction angle of 27°. A very slow direct shear test is then performed on a sample corresponding to the same effective stress conditions as experienced in-situ at the depth shown (16 m depth). The sample has the same orientation as the layering. Determine the total vertical and horizontal stresses corresponding to failure and the in-situ pore pressure. What is the orientation of the major principal stress with respect to the layering? (You may use the Mohr's circle). Clearly show your work and state assumptions made.
Based on undrained triaxial tests of a clay with pore pressure measurement, the material is found to have a CD cohesion of 25 kPa and corresponding effective friction angle of 27°. A very slow direct shear test is then performed on a sample corresponding to the same effective stress conditions as experienced in-situ at the depth shown (16 m depth). The sample has the same orientation as the layering. Determine the total vertical and horizontal stresses corresponding to failure and the in-situ pore pressure. What is the orientation of the major principal stress with respect to the layering? (You may use the Mohr's circle). Clearly show your work and state assumptions made.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:Based on undrained triaxial tests of a clay with pore pressure measurement, the material is found
to have a CD cohesion of 25 kPa and corresponding effective friction angle of 27°. A very slow
direct shear test is then performed on a sample corresponding to the same effective stress
conditions as experienced in-situ at the depth shown (16 m depth). The sample has the same
orientation as the layering.
Determine the total vertical and horizontal stresses corresponding to failure and the in-situ pore
pressure. What is the orientation of the major principal stress with respect to the layering? (You
may use the Mohr's circle). Clearly show your work and state assumptions made.
4 m
H₁ = 13 m
H₂= 7 m
WT
Impermeable rock
sandy gravel
n = 0.30
Y DRY
KN
3
=162
177
clay
Y = 17.6
KN
3
m³
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