(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.
[1] CLOUGH G W，DUNAN J M. Finite element analyses of retaining wall behavior[J]. Journal of the Soil Mechanics and Foundations Division，1971，97(12)：1 657–1 673.
[2] GOMEZ J E，FILZ G M，EBELING R M. Extended hyperbolic model for sand-to-concrete interfaces[J]. Journal of Geotechnical and Geoenvironmental Engineering，2003，129(11)：993–1 000.
[3] GOMEZ J E，FILZ G M，EBELING R M，et al. Sand-to-concrete interface response to complex load paths in a large displacement shear box[J]. Geotechnical Testing Journal，2008，31(4)：358–369.
[4] DESAI C S，DRUMM E C，ZAMAN M M. Cyclic testing and modeling of interfaces[J]. Journal of Geotechnical and Geoenvironmental Engineering，1985，111(6)：793–815.
[5] YIN Z Z，ZHU H，XU G H. A study of deformation in the interface between soil and concrete[J]. Computers and Geotechnics，1995，17(1)：75–92.
[6] HU L M，PU J L. Testing and modeling of soil-structure interface[J]. Journal of Geotechnical and Geoenvironmental Engineering，2004，130(8)：851–860.
[7] 张 嘎. 粗粒土与结构接触面静动力学特性及弹塑性损伤理论研究[博士学位论文][D]. 北京：清华大学，2002.(ZHANG Ga. A new monotonic and cyclic elasto-plasticity damage theory for coarse grained soil-structure interface[Ph. D. Thesis][D]. Beijing：Tsinghua University，2002.(in Chinese))
[8] 王 伟. 基于能量耗散原理的土与结构接触面模型研究及应用[博士学位论文][D]. 南京：河海大学，2006.(WANG Wei. Study on soil-structure interface model based on potential energy dissipating principle and its application[Ph. D. Thesis][D]. Nanjing：Hohai University，2006.(in Chinese))
[9] 中华人民共和国国家标准编写组. GB/T50123—1999 土工试验方法标准[S]. 北京：中国计划出版社，1999.(The National Standards Compilation Group of People?s Republic of China. GB/T 50123—1999 Standard for soil test method[S]. Beijing：China Planning Press，1999.(in Chinese))
[10] 栾茂田，武亚军. 土与结构间接触面的非线性弹性–理想塑性模型及其应用[J]. 岩土力学，2004，25(4)：507–513.(LUAN Maotian，WU Yajun. A nonlinear elasto-perfectly plastic model of interface element for soil-structure interaction and its applications[J]. Rock and Soil Mechanics，2004，25(4)：507–513.(in Chinese))
[11] LIU H B，SONG E X，LING H I. Constitutive modeling of soil-structure interface through the concept of critical state soil mechanics[J]. Mechanics Research Communications，2006，33(4)：515–531.
[12] ZEGHAL M，EDIL T B. Soil structure interaction analysis：modeling the interface[J]. Canadian Geotechnical Journal，2002，39(3)：620–628.
[13] ZHOU G Q，XIA H C，ZHAO G S，et al. Nonlinear elastic constitutive model of soil structure interfaces under relatively high normal stress[J]. Journal of China University of Mining and Technology，2007，17(3)：301–305.
[14] ANUBHAV，BASUDHAR P K. Modeling of soil-woven geotextile interface behavior from direct shear test results[J]. Geotextiles and Geomembranes，2010，28(4)：403–408.
[15] 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.
2012, Vol. 31 
