The figure shows an element of soil at the interface between two dry sand layers on a α=34
The interface is d=6
6 m below the ground surface and for both sand layers the friction angle is φ=30
30° and Ko = 0.42
0.42. Assume that the shear stress is zero on both the vertical and horizontal planes.
γd1 (dry unit weight of sand layer 1) = 18
γd2 (dry unit weight of sand layer 2) = 19
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