For a sample of dry, cohesionless soil with friction angle,

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For a sample of dry, cohesionless soil with friction angle, f, the failure plane will be inclined to the major principal plane by an angle equal to

1. Φ
2. 45°
3. 45° – Φ /2
4. 45° + Φ /2

Correct Option: D

Friction angle = Φ.
Angle between major principal plane and failure plane

= 45 +	Φ
	2

Angle between minor principal plane and failure plane

= 45 -	Φ
	2