The total active thrust on a vertical wall 3m high retaining a horizontal sand backfill (unit weight t = 20 kN/m3, angle of shearing resistance ' = 30 ) when the water table is at the bottom of the wall, will be:

The total active thrust on a vertical wall 3m high retaining a horizon

1.	The total active thrust on a vertical wall 3m high retaining a horizontal sand backfill (unit weight t = 20 kN/m3, angle of shearing resistance ' = 30 ) when the water table is at the bottom of the wall, will be:
A.	30 kN/m
B.	35 kN/m
C.	4 kN/m
D.	45 kN/m
Answer» B. 35 kN/m