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Soil Mechanics and Foundation - Interview Questions and Answers

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106. Shear strength of a soil is a unique function of
A. effective stress only
B. total stress only
C. both effective stress and total stress
D. none of the above
Explanation:
107. The angle that Coulomb's failure envelope makes with the horizontal is called
A. cohesion
B. angle of internal friction
C. angle of repose
D. none of the above
Explanation:
108. A cylindrical specimen of saturated soil failed under an axial vertical stress of 100kN/m2 when it was laterally unconfmed. The failure plane was inclined to the horizontal plane at an angle of 45�. The values of cohesion and angle of internal friction for the soil are respectively
A. 0.5 N/mm2 and 30�
B. 0.05 N/mm2 and 0�
C. 0.2 N/mm2 and 0�
D. 0.05 N/mm2 and 45�
Explanation:
109. Select the incorrect statement.
A. Effective cohesion of a soil can never have a negative value.
B. Effective angle of internal friction for coarse grained soils is rarely below 30�.
C. Effective angle of internal friction for a soil increases as state of compact-ness increases.
D. Effective angle of internal friction is a complicated function of mineralogy and clay size content.
Explanation:
110. If the shearing stress is zero on two planes, then the angle between the two planes is
A. 45�
B. 90�
C. 135�
D. 225�
Explanation:
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