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# week 9 tut - GPa and an area ratio RA=0.2(1 Calculate the...

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Tutorial questions 3 1 A hollow steel pile of circular cross section has a radius of 0.5 m. It is driven to a depth of 15 m into a layer of sand with a relative density of 0.6 and unit weight of 18 kN/m3. There is no sign of water in the layer. The rock bed is 30 meters below the surface. Calculate the settlement of the pile due to a load of 3000kN. Assume that the soil Young’s modulus is Esoil=80 MPa , and Poisson’s ratio is 0.2. The Young’s modulus of steel pile is Epile = 200 GPa and an area ratio R A =0.2. 2 A hollow pile with a diameter of 1.2 meters is driven 15 meters into a clay foundation. The soil is uniform with γ sat = 20 kN/M 3 , and its undrained shear strength is 60 kPa. A rock bed is found 42 meters below the clay. The water table is 1.5 meter below the surface. Assume that the soil Young’s modulus is Esoil=30 MPa. The Young’s modulus of steel pile is Epile = 200
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Unformatted text preview: GPa and an area ratio RA=0.2. (1) Calculate the allowable working load of the pile. A safety factor of 3 is required. (2) Estimate the settlement of the pile under the allowable working load. 3 As shown in the sketch, a group of seven hollow piles with a flexible cap is arranged in a circle. All the piles are floating concrete piles with a diameter of 1m and cast in place with 15 meters imbedded into sand. The sand is 30 meters above rock bed. No water exists within the layer. Assume that the sand Young’s modulus is Esoil=20 MPa, and Poisson’s ratio is 0.25, a total weight of 20 kN/m 3 . The Young’s modulus of steel pile is Epile = 20 GPa and an area ratio R A =0.5. Suppose the load of the pile group is uniformly distributed among the piles, estimate the settlement of the pile in the centre if the pile group is to carry a working load of 4500 kN. D g = 8m...
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