A study of crack propagation during blasting under high in-situ stress conditions based on an improved CDEM method

材料科学 原位 消散 压力(语言学) 结构工程 张力(地质) 断裂力学 应力集中 岩石爆破 压缩(物理) 复合材料 岩土工程 机械 地质学 工程类 语言学 哲学 物理 气象学 热力学
作者
Chenxi Ding,Xintong Liang,Renshu Yang,Zong‐Xian Zhang,Xiao Guo,Chun Feng,Xin‐Guang Zhu,Quanmin Xie
出处
期刊:Mechanics of Advanced Materials and Structures [Informa]
卷期号:31 (20): 4922-4939 被引量:12
标识
DOI:10.1080/15376494.2023.2208112
摘要

Considering the energy consumption of the crushed zone caused by blasting, the energy dissipation characteristics were investigated through theoretical calculation and a plug-in for calculation of energy reduction was made. As a result, an improved CDEM method suitable for studying blast-induced crack propagation was proposed. The improved CDEM method was then used to numerically simulate the blast-induced crack propagation under three different in-situ stress conditions: uniaxial in-situ stress, biaxial equal in-situ stresses and biaxial unequal in-situ stresses. It was found that the in-situ stress conditions had significant effects on the distribution of the blast-induced cracks, the evolution of blast-induced stresses and the propagation of the blast-induced cracks. At the uniaxial in-situ stress condition, the vertical in-situ stress reduced the tip stresses of the horizontal crack and inhibited the propagation of the horizontal crack. At the biaxial equal in-situ stress condition, the peak radial stresses and circumferential stresses of the gauging points decreased gradually with the increase of in-situ stresses. In particular, the circumferential stresses of the gauging points gradually changed from tension to compression with an increasing in-situ stress. At the biaxial unequal in-situ stress condition, there were different inhibitions on crack propagation in the horizontal direction and the vertical one.
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