You are designing a deep foundation for a high-rise building in an area with complex soil conditions. The soil profile consists of three layers:

1. The top layer is clay with a thickness of 5 meters and a unit weight (?) of 18 kN/m³.
2. The middle layer is a dense sand layer with a thickness of 8 meters and a friction angle (?) of 40 degrees and a unit weight (?) of 20 kN/m³.
3. The bottom layer is a loose sand layer with a thickness of 12 meters and a friction angle (?) of 32 degrees and a unit weight (?) of 19 kN/m³.

You need to determine the required pile length and diameter for a driven pile foundation to support a vertical load of 2000 kN. The allowable bearing capacity of the soil is 300 kN/m², and you should use a factor of safety (FS) of 3.

Answer rating: 100% (QA)

Calculate the ultimate bearing capacity qult for each soil layer For the clay layer Layer 1qult1 cNc ... View the full answer