(1. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education，Tongji University，Shanghai 200092，China；2. Department of Geotechnical Engineering，Tongji University，Shanghai 200092，China；3. Zhejiang Provincial Communicational and Transport Department，Hangzhou，Zhejiang 310000，China)
Abstract：The behavior of soil-structure interface is crucial to the design of pile foundation. The radial unloading occurs during the process of hole boring and concrete curing，which will effect the load transfer rule of pile-soil interface. Through the large shear tests on interface between clay and concrete，it can be concluded that the normal stress history influences significantly the shear behavior and strength parameter of interface. The numerical simulation of bored shaft-soil interaction problem requires proper modeling of the interface. Through taking the energy on the interface as a hardening parameter and viewing the shearing process of interface as the process of the accumulated energy dissipated to do work，considering the influence of normal stress history on the shearing rigidity，a mechanical model of interface between clay and concrete is put forward to take the effect of normal stress history into consideration. Then，The determination methods for the model parameters are introduced. The model based on a legible mathematical theory and all its parameters have definite physical meaning. The model is validated through the data from direct shear test. The results show that the model can reproduce and predict the mechanical behavior of interface between clay and concrete under arbitrary normal stress histories.
HOULSBY G T，WROTH C P. The variation of shear modulus of a clay with pressure and overconsolidation ratio[J]. Soils and Foundations，1991，31(3)：138-143.
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2012, Vol. 31 
