Study on crack propagation law of cylindrical charges in three-dimensional models

被引：0

作者：

Guo Y. ^{[1
]}

Li Q. ^{[2
]}

Yang R. ^{[1
,2
,3
]}

Xu P. ^{[2
]}

Wang Y. ^{[1
]}

Huo S. ^{[2
]}

机构：

[1] Beijing Key Laboratory of Urban Underground Space Engineering, School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing

[2] School of Mechanics & Civil Engineering, China University of Mining & Technology(Beijing), Beijing

[3] State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining & Technology(Beijing), Beijing

来源：

Zhendong yu Chongji/Journal of Vibration and Shock | 2020年 / 39卷 / 10期

关键词：

ABAQUS numerical simulation; Crack propagation; Cylindrical charge; Explosive stress wave; High-speed photography; Multifractal;

D O I：

10.13465/j.cnki.jvs.2020.10.018

中图分类号：

学科分类号：

摘要：

High-speed photography and numerical simulation were used to study the difference of crack propagation and damage of cylindrical charge when arranged at different positions in polymethyl methacrylate (PMMA). The results show that there are multiple radial cracks around the boreholes during forward and reverse detonation, and the explosive crack surface undergoes a gradual transformation from "dense corrugated" to "smooth flat" to "a small amount of radial microcracks" to "dense radial cracks". In the forward detonation, the radial crack occurs preferentially and gradually extends to the interior of the model, resulting in a large ultra-deep propagation at the bottom of the borehole. In reverse detonation, the bottom "conical" crack surface and the borehole radial crack occur at the same time, the crack surface at the bottom of the borehole consumes more energy, the radial crack propagation speed is smaller and the propagation time is shorter than that in the forward detonation, but it is beneficial to the throwing of rock. The simulation results show that the damage area of cylindrical charge reverse detonation is larger than that of forward detonation blasting, and the uniform degree of blasting damage is better. Therefore, in groove blasting, in order to improve the throwing effect of the rock, the reverse detonation method should be adopted as long as possible.While in the loose blasting, in order to increase the crack propagation depth in the rock, the forward detonation method should be adopted as long as possible. © 2020, Editorial Office of Journal of Vibration and Shock. All right reserved.

引用

页码：133 / 140and184

共 22 条

[1] STARFIELD A M, PUGLIESE J M., Compression waves generated in rock by cylindrical explosive charges: a comparison between a computer model and field measurements, International Journal of Rock Mechanics and Mining Sciences and Geomechanics, 5, 1, pp. 65-77, (1968)
[2] WEI Haixia, ZHANG Qiangqiang, Calculation and analysis on stress superposition model of equivalent spherical charge, Blasting, 33, 4, pp. 15-21, (2016)
[3] (2015)
[4] LU Sijie, ZHANG Fengde, WANG Yuanming, Et al., Numerical simulation on damage effects of bare blasting on concrete pavement, Hydropower and New Energy, 8, pp. 19-22, (2017)
[5] (2017)
[6] GU Hongwei, ZHAO Yanming, JIN Wen, Numerical simulation of explosion with cylinder charge in rock, Engineering Blasting, 13, 1, pp. 24-27, (2007)
[7] CHEN Yeqing, JI Guodong, 3D numerical simulation of explosion of bundle blastholes in rock, Engineering Blasting, 6, 3, pp. 8-12, (2000)
[8] LIU Yongsheng, PENG Jianguo, WANG Mengshu, Vibration field feature research of subsea tunnel during drilling and blasting excavation, China Civil Engineering Journal, 48, pp. 341-345, (2015)
[9] BLAIR D P., Blast vibration dependence on charge length, velocity of detonation and layered media, International Journal of Rock Mechanics and Mining Sciences, 65, pp. 29-39, (2014)
[10] BLAIR D, MINCHINTON A., On the damage zone surrounding a single blasthole, Fragblast, 1, 1, pp. 59-72, (1997)

← 1 2 3 →