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Abstract It is founded that the value of side soil resistance of pile will change distinctly in different situation，to determine it more accurately the influence factors of it need to be researched. Based on the mechanism analysis it can be concluded that the determinant influence factors of side soil resistance of pile are the strength of pile-soil interface，the strength of soil and the stress condition of soil. The stress condition of soil is the main reason which causes the variety of side soil resistance of pile，because it will change in different situations，influence the value of pile-soil interface strength，and make soil have different shearing-resistant abilities under a certain strength condition. An internal force test of three PHC pipe piles and its results are introduced. ADINA software is used to analyze the testing piles. The analysis includes possible destroy positions，pile-soil interface parameters and the changes of side soil pressure of pile in different depths of soil and under different loads. It is founded that damages all occur in the pile-soil interface of three testing piles，so the pile-soil interface parameters can be worked out using the testing value of side soil resistance. It is found that for silt soil adhesive force is the main interface force，but for sandy soil or residual soil，the friction is the main interface force. When friction is the main interface force，the change of side soil pressure of pile can cause the variation of side soil resistance of pile.
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Received: 30 June 2009
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