The depth of water in a lake is 4m. the soil at the bottom of the lake consists of sandy clay. the moisture content of the soil was determined to be 25%. the sg of the soil is 2.70. At 5 m depth into the bottom of the lake the void ratio is 0.675, the saturated unit weight is 19.77 kn/m^3. the total stress is 138.1 kpa, the pore water pressure is 88.29 kpa, and the effective stress is 49.81 kPa. Consider problem 8.11 that you just solved. Most designs require taking into account the soil profile up to where  Δσ = 0.1*q. For this problem, to what depth must the soil profile be evaluated? This can be solved with circular or rectangular load. Assumptions must be stated. Note: this would be the type of rationale that you would use as an engineer to decide "how deep should our boreholes be for our field exploration program" and "when I made my model / run my calculations, how far down should I run my z-axis below ground surface".

The depth of water in a lake is 4m. the soil at the bottom of the lake consists of sandy clay. the moisture content of the soil was determined to be 25%. the sg of the soil is 2.70. At 5 m depth into the bottom of the lake the void ratio is 0.675, the saturated unit weight is 19.77 kn/m^3. the total stress is 138.1 kpa, the pore water pressure is 88.29 kpa, and the effective stress is 49.81 kPa. Consider problem 8.11 that you just solved. Most designs require taking into account the soil profile up to where  Δσ = 0.1*q. For this problem, to what depth must the soil profile be evaluated? This can be solved with circular or rectangular load. Assumptions must be stated. Note: this would be the type of rationale that you would use as an engineer to decide "how deep should our boreholes be for our field exploration program" and "when I made my model / run my calculations, how far down should I run my z-axis below ground surface".