Square precast concrete piles with a side width of 10 inches will be driven to a tip penetration of forty feet. The soil profile is all clay and the water table is at the ground surface. Unconfined...

Square precast concrete piles with a side width of 10 inches will be driven to a tip penetration of forty feet. The soil profile is all clay and the water table is at the ground surface. Unconfined compression tests on samples taken from 3-inch diameter thin-walled Shelby tubes were performed, and the soil profile had the following stratification: Estimate the axial compressive load capacity using the following methods, neglecting the side shear in the top 1B and bottom 1B. State any necessary assumptions. Show a summary table comparing the different capacities and discuss reasons for differences. a. Tomlinson's 1957 alpha method (alpha method #1) b. Tomlinson's 1971 alpha method (alpha method #2) c. Original lambda method (lambda method #1) d. Dennis and Olson (1983) alpha method Grad. Only: Burland (1983) beta method f Grad. Only Revised lambda method based on pile length (lambda method #2) g. Grad Only: API method (Randolph and Murphy 1985)