旁压试验反演邓肯-张模型参数方法研究 English Version
Study on back-analysis method of constitutive parameters for Duncan-Chang model based on in-situ pressuremeter tests
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摘要: 研究了联合室内模拟试验和现场旁压仪试验综合确定邓肯 -张E-B 模型有关参数的方法。内容包括 :①采用邓肯 -张E-B 模型和有限元方法 ,对旁压试验机理进行数值模拟 ;②研制采用阻尼最小二乘法非线性优化理论 ,依据实测旁压曲线 ,进行土体本构模型参数反演的方法和计算机程序 ;③在对模型各参数敏感性分析基础上 ,以室内试验结果为初值 ,对某工程地基覆盖层现场旁压试验实测曲线进行E-B 模型参数的反演分析。为实际工程的计算分析提供了更为可靠依据Abstract: This paper attempts to develop a method to back-analyze the constitutive parameters for Duncan-Chang E-B model, based on in-situ pressuremeter tests. The main work includes:①the working mechanics of pressuremeter test is numerically simulated with finite element method, in which Duncan-Chang E-B model is applied;②a practical back-analysis method and computing program of constitutive parameters for Duncan-Chang E-B model are developed, based on the non-linear optimization theory with damping least squares;③some measured pressuremeter curves are back-analyzed with the method to determinate Duncan-Chang E-B model parameters for the foundation soil of some practical project, based on sensitivity analysis of parameters and laboratory tests, and the calculated results are proved practically significant.
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