Soil Mechanics and Foundation
In the triaxial compression test, the application of additional axial stress (i.e. deviator stress) on the soil specimen produces shear stress on

both horizontal and vertical planes
vertical plane only
all planes except horizontal and vertical planes
horizontal plane only

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Soil Mechanics and Foundation
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

0.05 N/mm² and 0°
0.2 N/mm² and 0°
0.05 N/mm² and 45°
0.5 N/mm² and 30°

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