A soil strata can be described as6 meters of sand underlain by 4 meters of clay with the water table located at 7 meters from the bottom of the said strata. The sand has a dry and saturated unit weight of 14 kn/m3
and 18 kn/m3
respectively. On the other hand pertinent clay properties are saturated unit weight of 19 kn/m3, void ratio of 0.8 and liquid limit of 40.
If a rectangular dimension 2.5m by 3.5m supporting a load of 900kN is supported at a depth of 1.5m below the soil, at what depth will the total stress be 250kPa. Utilize 2-1 approximation to address this problem.