改进的邓肯-张本构模型在碎石土边坡稳定性分析中的应用

Application of Improved E-B Constitutive Model in the Stability Analysis of Gravel-soil Slope

在Visual Studio环境中,以FLAC中的Mohr-Coulomb本构模型为框架,进行邓肯-张本构模型的二次开发。对某碎石边坡分别调用Mohr-Coulomb模型、邓肯-张模型、二次开发的改进邓肯-张模型进行稳定性分析。由于改进邓肯-张本构模型能较好地描述碎石土的非线性,反应土的剪胀性,且不受土体剪应变较大的影响,评价结果更为合理。

Taking the Mohr-Coulomb constitutive model in FLAC as a framework, the improved E-B constitutive model is redeveloped in Visual Studio environment, and then the Mohr-Coulomb constitutive model of FLAC, E-B constitutive model and improved E-B constitutive model are used to analyze the stability of a gravel-soil slope respectively. The comparison of calculated results shows that, because the improved E-B constitutive model can more accurately describe the nonlinear of gravel-soil and the dilatancy of soil and is not seriously impacted by soil shear--strain, the stability evaluation of improved E-B constitutive model is more reasonable.