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Abstract The deep foundation pit is characterized by large-scale excavation，deep excavation depth and complex stress path. The choice of soil constitutive model is the key to numerical analysis of deep foundation pit. On the basis of theoretical analysis of hardening soil(HS) model and model parameters，HS model parameters of the typical soil in Wuxi district are determined through different stress paths experiments in laboratory. Numerical analyses for construction process of station foundation pit in #2 line of Wuxi metro and Henglong foundation pit are performed using three-dimensional Z_Soil software，and numerical results are in good agreement with actual monitoring data. Research shows that HS model can reflect not only the nonlinear characteristics of soil′s stress and strain，but also the complex stress path of deep foundation pit. HS model is suitable for the hard soil in Wuxi district，and the HS model parameters decided by experiment can be applied to calculation of deep foundation pit in Wuxi district，and the numerical method is reliable.
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Received: 13 August 2013
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2014, Vol. 33 
