Using the data in Problem and the AASHTO resistance factors, compute φPn.
Problem
A 600 mm square prestressed concrete pile is to be driven to a depth of 20.0 m into the following soil profile:
Depth (m) | Soil Classification | Unit Weight, γ (kN/m3) | Undrained Shear Strength, Su(kPa) |
0–3.0 | Silty clay | 17.0 | 50 |
3.0–10.2 | Clayey silt | 17.5 | 55 |
10.2–12.0 | Clay | 17.8 | 80 |
12.0–22.0 | Clay | 18.1 | 120 |
The groundwater table is at a depth of 5 ft. Using the Randolph and Murphy method with a factor of safety of 3.0, compute the ASD allowable downward load capacity, Pa.
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