【作者】 陈欣； 周维垣； 杨若琼；

【Author】 Chen Xin;Zhou Weiyuan;Yang Ruoqiong Department of Hydraulic Engineering, Tsinghua University, Beijing, 100084 China

【机构】 清华大学水利系；

【摘要】 界面元数值方法的基本求解方程可以由虚功原理推导得出。考虑到目前界面元方法中通常采用的Mohr-Coulomb屈服准则并不能模拟出材料的破坏过程,尤其不能反映出破坏过程中材料性质的逐渐减弱,因此在界面材料的本构关系中引入了损伤变量,利用标量形式的等效应变衡量材料的受损程度,因而可以有效地模拟材料损伤后应力逐渐减小的过程。与最大拉应力准则相比,损伤方法更能体现材料屈服后实际承载力的弱化过程。数值算例的结果验证了本方法的正确性。文中对溪洛渡拱坝破坏过程的数值模拟与仿真试验破坏结果进行对比,破坏形式较为吻合。更多还原

【Abstract】 Basic foundations of numerical solution of interface stress element (ISE) can be given based on virtualwork principle. Mohr-Coulomb yield criterion with lower tensile property used in ISE in common cannot simulatefailure behavior of material, so the damage variable is introduced in constitutive relation of interface material.Equivalent strain of scalar type is used to describe damage evolution. As a consequence, stress decrease can bereflected in calculation after damage appears. The damage model in the article can simulate strain softeningprocess rather than the maximum tensile stress. Numerical results of Xi Luo Du high arch dam are compared withtest results, and advantages are proved in numerical simulation.更多还原