A line of diaphragm wall is driven 4m into a firm clay and retains, on one side, a 3m depth of sand on top of the clay. Water table is at the surface of the clay. The unit weight of the fill is 17kN/m 3 and the saturated unit weight of the clay is 19.5kN/m 3 . T he shear strength parameters of sand are c ’ =0 and j ’ =30 ° ; the shear strength parameters of clay are c ’ =10 kN/m 2 and j ’ =20 ° . T he surface of the wall is vertical and smooth. (1) The coefficient of active earth pressure of sand is ( ); (2) The coefficient of active earth pressure of clay is ( ); (3) The coefficient of passive earth pressure of clay is ( ); (4)The active earth pressure at the lower end of the diaphragm wall is ( ); (5)T he passive earth pressure at the lower end of the diaphragm wall is ( ); (6) The total active thrust acting on the wall is ( ); (7) The total passive resistance acting on the wall is ( ).