接触面弹塑性损伤模型在面板堆石坝应力变形分析中的应用

Application of elasto-plasticity damage interface model in stress-strain analysis of CFRD

本文建立粗粒土与结构接触面弹塑性损伤模型及其数值格式,可以较好地描述垫层料等粗粒土与结构接触面的静动力学特性;编制程序,模拟接触面试验结果,采用不同接触面模型及参数对某高面板堆石坝的应力变形进行三维有限元分析。面板与垫层料接触面的本构模型及参数对面板应力变形影响很大,接触面弹塑性损伤模型及其数值格式适用于面板堆石坝的应力变形分析,不仅能够较为合理全面地描述土与结构接触面的体应力应变关系、剪应力应变关系及其耦合力学特性,而且还能模拟混凝土面板和垫层土接触面之间的滑移和脱开的不连续性。

A new elasto-plasticity damage interface model called EPDI and its numerical method are presented to unitedly characterize the monotonic and cyclic behavior of interface between the structure and coarse grained soil. The model is programmed and used to predict the response of the interface. A high concrete face rock-fill dam （CFRD） is analyzed by FEM with various interface models and parameters. The stress and deformation of the concrete face are much affected by the models and parameters of the interface. The present interface model is suitable for stress-deformation analysis of CFRD with good accuracy, because it could not only characterize the volumetric stress-strain relationship, shear stress-strain relationship and their coupling, but also simulate the discontinuity such as slippage and local disengagement of concrete face-soils interface.