岩体结构面非线性弹性-塑性软化本构模型研究

Nonlinear Elasto-plastic Softening Constitutive Model for Rock Interfaces and Joints

在总结评述现有岩体结构面本构模型的基础上,将非线性弹性模型和弹塑性模型结合起来,并采用起伏角磨损演化方程来定量描述结构面的磨损软化,建立了岩体结构面非线性弹性-塑性软化本构模型。利用新建立的模型对岩体结构面直剪试验进行了预测,模型预测结果与试验结果吻合良好,验证了模型的有效性和模拟能力。该模型概念清晰,参数易于确定,能够合理描述岩体结构面的非线性变形、塑性软化、弹塑性耦合、剪胀和磨损等主要力学特性。

Based on the review of existing constitutive models of rock interfaces and joints, a nonlinear elasto-plastic softening constitutive model is developed by combining the nonlinear elastic model, the elasto-plastic model, and the degraded evolutionary equation where the degradation of the rock interfaces and joints is determined. Compared with the direct shear test resultsof rock interfaces and joints, the numerical prediction results by the proposed model are in good agreement, which validates the effectiveness and ability of simulation of this model. The model is explicit with easyly determined parameters. Moreover, it can reasonably describe fundamental mechanical behaviors of the rock interfaces and joints such as nonlinear deformation, strain softening, coupling of elasticity and plasticity as well as, dilation and degradation.