摘要
实际工程使用有限元软件ABAQUS对岩土工程问题进行分析,会遇到Mohr-Coulomb(M-C)模型和系列Drucker-Prager(D-P)模型选择的问题。本文通过M-C模型参数与D-P模型参数相互转换,比较M-C模型和D-P模型在边坡稳定分析中的适用性,比较后选用指数D-P模型为分析模型.土性参数分为塑性参数(粘聚力、内摩擦角、剪胀角)和弹性参数(弹性模量和泊松比),通过实际算例研究土性参数对边坡稳定性的影响。算例表明,D-P模型中对安全系数影响最大的是塑性参数,塑性参数中对安全系数影响最大的为粘聚力,最小的是剪胀角;所有的参数都对最大等效应变值和y轴位移有影响。因此在边坡稳定分析中,对于D-P指数模型的运用,塑性参数的选择一定要慎重。
It will be encountered the problem how to choose the model between Mohr-Coulomb（M-C） and Drukher-Prager（D-P）,when using the finite element software of ABAQUS to analyze the geotechnical problems in actual project.By matching the MC model parameters with the D-P model parameters and comparing the applicability of the two models in the slope stability analysis,the exponential D-P model is chosen as the analysis model.Soil behavior parameters are divided into the plastic parameters（cohesion,internal friction angle,dilation angle） and the elastic parameters（elastic modulus and Poisson＇s ratio）,and through practical examples,the influence of soil behavior parameters to slope stability is studied.The results show that the greatest impact on the safety factor in the D-P model is plastic parameter,the greatest impact on the safety factor in the plastic parameters is cohesion,and the smallest is dilation angle;all of the parameters would affect to the maximum equivalent strain value and y-axis displacement.Therefore,if the exponential D-P model is used to analyze the slope stability,the selection of plastic parameters should be careful.
出处
《水利与建筑工程学报》
2011年第3期1-7,共7页
Journal of Water Resources and Architectural Engineering
基金
国家自然科学基金(50868009)
