Soil Mechanics and Foundation
A plane inclined at an angle ‘φ’ to the horizontal at which the soil is expected to stay in the absence of any lateral support, is known as

Natural slope line
The φ line
Repose line
All listed here

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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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