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Abstract In order to study the mechanism of pile-soil interaction and the effect of variable rigidity design after the settlement adjustor is installed，two sets of comparative model tests are carried out to analyze the behaviors of frictional single pile and pile groups under conventional condition and settlement adjusting. The analytical results show as follows：(1) The application of settlement adjustor in single pile can obviously change the load transfer rule，give top priority to soil beneath the raft and its bearing capacity can be well developed；and the load bearing ratio of pile to soil is optimized. However，it is found that negative friction resistance distributes in a certain range below pile top. (2) By use of the settlement adjustor in friction pile group foundations，the supporting stiffness of pile foundation can be optimized. The variable rigidity design of pile raft foundation is realized successfully when the bearing capacity of foundation soil is well developed，which effectively reduces the differential settlement of pile raft. The conclusions can provide the experimental basis for further theoretical research.
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Received: 15 April 2011
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2011, Vol. 30 
