岩体分类
接头(建筑物)
断裂力学
叠加原理
裂缝闭合
压力(语言学)
材料科学
岩石爆破
结构工程
波传播
应力集中
强度因子
应力波
岩土工程
机械
地质学
工程类
光学
物理
语言学
哲学
量子力学
作者
Xintong Liang,Chuanxian Ding,Xing Zhu,Jun–Mei Zhou,Cheng Chen,Xiao Guo
标识
DOI:10.1016/j.engfracmech.2023.109833
摘要
In this study, the simultaneous observation of stress wave propagation and crack propagation was realized through the wave-crack synchronous test, which clarified the stress wave propagation and superposition process of rock blasting with jointed rock. The variation law of crack dynamic parameters (stress intensity factor and propagation velocity) was also revealed. On this basis, numerical simulation study was performed using the CDEM method to analyze the influence mechanism of joint length and in-situ stress condition on the blasting stress evolution and crack propagation. The results showed that the joint had significant effect on the distribution state, the evolution law and the propagation process of blasting crack. The blasting stress wave diffracted from the joint end, propagated along the joint plane and superimposed, causing the stress concentration and crack initiation and propagation at the joint end. The longer the joint length, the longer the diffraction time and propagation time of the blasting stress wave along the joint plane. In addition, the biaxial equal in-situ stresses inhibited the propagation of the blasting crack. The inhibition effect was significantly strengthened with the increase in in-situ stress, while it promoted the initiation and propagation of the blasting crack in the middle of the joint.
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