A 7m frictionless retaining wall has three types of soils behind it; a 4m loose sand on top of a 2m dense sand and the two are resting a 1m clay soil. There is also a surcharge = q = 25kpa. The loose sand has the following properties ysat=20 kN/m3 C'= 0 and o'= 320, the dense sand has the following properties ysat= 19 kN/m3 C'= 0 and o'= 380 and the clay soil has the following properties ysat= 22 kN/m3 C'= 65 kN/m2 0 and o'= 380 The water table is at 3.5m below the ground surface, the equivalent horizontal force acting on the wall is 1756 kN/m2. Show the profile or a neat diagram for solving this LEP problems.