基于摩尔-库仑模型软土地基力学参数的敏感性分析

摘要

摩尔-库仑模型是岩土工程有限元计算中的常用模型,模型参数需通过剪切试验或三轴排水试验得出.由于软土地基材料的特殊性,试验不易得到部分参数的准确值.采用ABAQUS建模进行了软土地基算例计算,并与土力学解析解对比证明其准确性.然后对基于摩尔-库仑模型的软土地基力学参数进行了敏感性分析,得到了各参数变化引起土体沉降变化的关系曲线,提出了泊松比、弹性模量、摩擦角和内聚力对土体沉降的影响规律,可为软土地基有限元计算的参数选取提供参考.%Mohr-Coulomb model is commonly used in geotechnical engineering finite element method.Parameters of the model should be obtained by shear test or triaxial drainage experiments.Due to the particularity of soft soil foundation,the experiment is not easy to get the accurate values of some parameters.The authors calculated an example of soil mechanics by ABAQUS,and the result were compared with analytical solution to prove its accuracy.Then perform sensitivity analysis of mechanical parameters for soft soil foundation based on Mohr-Coulomb Model were carried out,the relation curve of soil settlement changes caused by the parameters change were gained.The influence rules on soil settlement for poisson′s ratio,elasticity modulus,friction angle and cohesion were analyzed.All these can provide reference to the parameters selection of soft soil foundation′s finite element calculation.