基坑变形预测的改进MSD法

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Abstract Firstly，the mobilizable strength design(MSD) method for predicting deformation induced by excavation is introduced. The method cannot only use the strain-stress curve of site soil but also take the effect of heterogeneity and anisotropy of soil on undrained strength of soil into account. Then，after considering the undrained anisotropic shear strength of K0 normally consolidated soft clay and bending strain energy of retaining wall，the MSD method is modified. A numerical example is calculated by the modified MSD method in the end. The results calculated by the modified MSD method are compared with those calculated by finite element method(FEM) based on the MIT–E3 constitutive model and normal MSD method. It is shown that the results calculated by the modified MSD method are closer to those calculated by the FEM，which proves that the modified MSD method is more suitable for calculating deformation induced by excavation.

Key words： soil mechanics modified mobilizable strength design(MSD) method strength anisotropy bending strain energy excavation of foundation pit deformation prediction

Received: 10 May 2010

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