基坑变形预测的改进MSD法

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摘要首先，介绍一种可以预测基坑变形的新方法——MSD法，该方法不仅可以引入场地土的应力–应变关系，并且可以考虑土体非均质性与各向异性对土体不排水强度的影响；然后，在考虑K0正常固结软黏土的不排水各向异性抗剪强度和围护结构本身的弯曲应变能的基础上，对MSD法进行改进；最后，采用改进MSD法进行算例计算，通过与基于MIT–E3本构模型的有限单元法和MSD法计算结果进行比较，采用改进MSD法得到的计算结果与有限单元法计算得到的结果更为接近，从而证明本文对MSD法的改进是可取的。

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关键词 ：土力学, 改进的MSD法, 强度各向异性, 弯曲应变能, 基坑开挖, 变形预测

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

收稿日期: 2010-05-10

引用本文:

王浩然1，2，王卫东1，3，黄茂松1，2，徐中华3. 基坑变形预测的改进MSD法[J]. 岩石力学与工程学报, 2011, 30(S1): 3245-3251.
WANG Haoran1，2，WANG Weidong1，3，HUANG Maosong1，2，XU Zhonghua3. MODIFIED MOBILIZABLE STRENGTH DESIGN(MSD) METHOD ON DEFORMATION PREDICTIONS OF FOUNDATION PIT. , 2011, 30(S1): 3245-3251.

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http://www.rockmech.org/CN/Y2011/V30/IS1/3245

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