提出了一种用于描述岩土介质在冲击载荷下渐进破坏过程的显式数值分析方法(CDEM).该方法将有限元及块体离散元进行有机结合,利用块体表征材料的弹性、塑性、损伤等连续特征,利用块体间的界面表征裂纹的萌生、扩展及贯通过程.利用CDEM分析了钻地弹的侵彻过程,提出了一种基于破裂度的岩土介质破碎程度评价方法,给出了侵彻面上破碎坑的基本形态及径向裂缝的分布,获得了冲击速度与侵彻深度的正相关关系.数值计算获得的破裂形态及侵彻深度与相关文献的实验及理论分析结果基本一致,证明了所述数值计算方法的正确性.基于一虚拟工况,借助CDEM,分析了钻地弹侵彻及爆炸的双重效应对周边岩体及地下构筑物的影响规律.%To simulate a progressive failure process of rock and soil under impact loads, an explicit numerical analysis method named CDEM was proposed.In this method, FE and block DE were well combined.Blocks were used to characterize elastic, plastic and damage features of materials.Interfaces among blocks were adopted to characterize processes of crack initiation, propagation and penetration.With CDEM, the penetrating process of an EPW was analyzed, and an evaluation method for rock and soil crushing degree based on the fracture degree was proposed.The basic pattern of crushing pits and the distribution of radial cracks on a penetrating surface were deduced, and the positive correlation between impact velocity and penetrating depth was gained.It was shown that the numerical results of crushing pattern and penetrating depth agree well with those of tests and theoretical analysis in references to verify the correctness of CDEM.Finally, based on a virtual case, the penetrating and blasting effects of an EPW on the surrounding rocks and underground structures were analyzed using CDEM.
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