基于CDEM的钻地弹侵彻爆炸全过程数值模拟研究

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摘要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，证明了本文所述数值计算方法的正确性。最后，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。

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关键词 ：钻地弹, 侵彻, 爆炸, 数值模拟, 裂纹扩展, 破裂度

Abstract：To simulatethe progressive failure process of rock and soil under impact load, an explicit numerical method named CDEM is proposed.In this method, FEM and block DEM are coupled together. Blocks are used to represent the elastic, plastic and damage features of media. Interfaces between blocks are adopted to model the process of fracture appearance, propagation and penetration.By CDEM, the penetrating process of EPW is analyzed, and an evaluation method for rock and soil cracks based on fracture degree is proposed. The basic pattern of crushing pit and the distribution of radial fractures on penetrating surface are obtained, and the positively correlated relationship between impact velocity and penetrating depth is gained. The numerical results of fracture pattern and penetrating depth are the same as the ones obtained from experiments and theoretical formulas, which demonstrates the accuracy of this numerical method. Finally, based on a virtual case, the penetrating and blasting effects of EPW to the surrounding rocks and underground structures are discussed by CDEM.

Key words： EPW penetrating blasting numerical simulation fracture propagation fracture degree

收稿日期: 2016-01-25 出版日期: 2017-06-28

引用本文:

冯春1，李世海1，郝卫红2，葛伟2. 基于CDEM的钻地弹侵彻爆炸全过程数值模拟研究[J]. 振动与冲击, 2017, 36(13): 11-18.
Feng Chun1 Li Shi-hai1 Hao Wei-hong2Ge Wei2. Numerical Simulation on Penetrating and Blasting Process of EPW based on CDEM. JOURNAL OF VIBRATION AND SHOCK, 2017, 36(13): 11-18.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2017/V36/I13/11

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