6. A pile of 0.50 m diameter and of length 10 m is embedded in a deposit of clay. The un-drained strength parameters of the clay are cohesion = 60 kN/m2 and the angle in internal friction = 0. The skin friction capacity (kN) of the pile for an adhesion factor of 0.6, is
10. 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: