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Abstract Based on undisturbed soil tangent modulus method，a new practical settlement calculation method for rigid- pile composite foundation is proposed. The load-settlement curve of soil under foundation and the load-settlement curve of rigid-pile are obtained by the undisturbed soil tangent modulus method. Considering that the settlement of pile and soil is equal when they support the foundation jointly，the load-settlement curve of the rigid-pile composite foundation is obtained based on the load-settlement curve of soil and the load-settlement curve of rigid-pile，then the settlement of rigid-pile composite foundation can be gotten from the load-settlement curve. For the composite foundation with loading test，the settlement of rigid-pile composite foundation can be calculated by the hyperbola tangent modulus equation which is put forward by directly using the test curve. The practical examples prove that the new method has more precision for settlement calculation.
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Received: 10 July 2009
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