2. Solve the following problem. A smooth, 12m long concrete pile with square cross section and width = 0.35m is driven into an 18m thick sand layer with OCR =

2 and fiction angle = 38 degrees. The allowable settlement for the pile is da = 2cm. The calculated load-settlement curve reveals that the critical load (associated with da = 2cm) is 600kN. Determine the actual allowable load.