Estimate the length of a 600mm diameter bored pile required to support an unfactored load of...

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Civil Engineering

Estimate the length of a 600mm diameter bored pile required tosupport an unfactored load of 1200 kN. The pile is embedded in acohesive soil with an average undrained shear strength of 150 kPaand bulk unit weight = 20 kN/m³. The adhesion factor,alpha, may be assumed to be 0.4. The required overall factor ofsafety is to be at least 3.0. (Assume the density of the pile isequal to the density of the soil).
Hint: Express thecapacity of the pile in terms of the unknown length, L. Solve forL
For the pile in a) estimate the pile head settlement under theunfactored load. The Youngâ€™s Modulus of the soil may be assumed tobe 230 times the average undrained shear strength. Take the Youngâ€™sModulus of concrete to be 27 GPa.
If this pile is part of a group of 8 piles (each with a load of1200 kN) arranged in a 3 -2 - 3 pattern, estimate the settlement ofthis pile group at the pile cap level.

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4.0 Ratings (600 Votes)

Designing the pile for a safety factor 3Working Load carried by the pile Qup 1200 x 3 3600 KNCapacity of the pile is given by the equationQup Qeb Qsfeqn1whereQup Design working load on the pile 3600 KNQeb End Bearing Resistance of the Pile and is give as perMayerhoff equation as ie C cohesion at the base of the pile 150 KNm2 d 600 mm 06 m See Answer

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