A circular foundation of diameter 8 m supports a tank. The base of the foundation is at 1 m from the ground surface. The vertical load is 20 MN. The tank foundation was designed for short-term loading conditions (su = 80 kPa and Ysat = 19 kN/m³). The groundwater level when the tank was initially designed was at 4 m below the ground surface. It was assumed that the groundwater level was stable. However, Fourteen months after the tank was constructed and during a week of intense rainfall, the groundwater table reached the base of the circular footing and the tank foundation failed. It was speculated that failure occurred by bearing capacity failure. As a result of your calculations, establish and show whether this is correct or not. The friction angle is $'p = 25° from simple shear tests. 20 MN D=8m D₁ = 1 m Ground Surface

A 5-ft fill is to be placed over the following soil profile shown below. Determine if the clay is normally consolidated or over-consolidated. The pre-consolidation pressure (past maximum consolidation stress) of the clay is 1000 lb/ft3. 5 ft 2 ft 4 ft Proposed Fill, y = 120 lb/ft³ Sand Clay Rock 2 ft A Ydry = 100 lb/ft³ Ground water table Ysat 110 lb/ft³ = o'= Pc = 1000 lb/ft²