基坑工程平面竖向弹性地基梁法中土的水平抗力比例系数反分析研究

提出了一种结合Ucode反分析软件和Abaqus有限元分析软件，并根据围护墙实测变形来反分析基坑工程平面竖向弹性地基梁法中土的水平抗力比例系数的方法。重点讨论了反分析的原理和实现流程，给出了反分析过程中迭代控制参数的确定方法及待估参数取值的确定方法。通过参数敏感分析可找到对围护结构变形影响较大的土层，针对起主导作用的土层m值进行反分析，既可提高迭代效率，又能保证反分析结果的准确性。实际工程反分析的结果表明，计算值与实测围护墙变形吻合得很好。在此基础上，根据多个测孔的反分析结果给出了各层土的水平抗力比例系数的建议取值。

Back analysis of proportional coefficient of horizontal resistance in vertical elastic subgrade beam method for deep excavations

A method is proposed to conduct back analysis of the proportional coefficient of horizontal resistance in vertical elastic subgrade beam method for deep excavations according to the measured deformation of retaining wall. The Ucode program is coupled with the Abaqus software in order to achieve this process. This article focuses on the theory and implementation process in the back analysis. Methods for determining the controlling parameters in Ucode program and the parameters to be estimated are also proposed. The soil layer which significantly affects the lateral displacement of retaining wall can be found by parameter sensitivity analysis. Back analysis of the m values for these soil layers can improve both the efficiency of iteration and the accuracy of back analysis results. The methodology is used to analyze an actual project and it is found that the simulated wall displacements is well consistent with the measured ones. According to the back analysis results from several inclinometers, the suitable proportional coefficient of horizontal resistance of each soil layer for this project is obtained.