20 m long bored concrete pile having a diameter of 350 mm is load tested, and the data are given below: Load (kN) 0 250 500 750 1000 1250 1000 750 500 250 0 Settlement (mm) 0 2.0 5.0 8.2 15.0 39.6 39.5 38.2 37.5 36.1 35.5 Given: Econcrete = 25 x 103 MN/m2 . a. Estimate the allowable pile load using Davisson's (1973) method, with FS=2.5. b. At the maximum load of 1250 kN, what are the total and net settlements?

A concrete pile group 3x3 with spacing of 0.6m is used to support a wind turbine in a sand deposit. Individual pile diameter = 0.3 m and length=6m. A. If the allowable (working) lateral capacity for a single pile is 95 kN, what is the maximum allowable lateral deflection for each pile? B. Is the lateral deflection acceptable? Explain your answer in 1-2 sentences.

7. A 12m long concrete pile with diameter = 0.45m is drilled into normally consolidated clay with S, = 90 kPa and friction angle = 32 degrees. The pile is loaded with 300 kN and in response to such loading, it settles 2.5mm. What is the mobilized short term end bearing resistance? Show your work and circle your answer.

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