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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。
First of all, a new method that can predict the deformation of foundation pit - MSD method is introduced. This method can not only introduce the stress-strain relationship of site soil, but also consider the influence of soil heterogeneity and anisotropy on undrained soil strength Then the MSD method is improved based on the undrained anisotropic shear strength of the normal consolidated clay K0 and the bending strain energy of the envelope itself. Finally, an improved MSD method Comparing with the finite element method and the MSD method based on the MIT-E3 constitutive model, the calculated results obtained by the improved MSD method are more similar to those obtained by the finite element method, Improvement is desirable.