Numerical simulation of effect of confining pressure on rock crack propagation under underwater explosion loading

被引：0
|
作者：
Yu Q. [1 ]
Zhang H. [1 ]
Cai Z. [1 ]
机构：
[1] College of Petroleum Engineering, China University of Petroleum(Beijing), Beijing
来源：
Zhongguo Shiyou Daxue Xuebao (Ziran Kexue Ban)/Journal of China University of Petroleum (Edition of Natural Science) | 2022年 / 46卷 / 03期
关键词：
confining pressure; crack propagation; numerical simulation; shock wave; underwater explosion;
D O I：
10.3969/j.issn.1673-5005.2022.03.011
中图分类号：
学科分类号：
摘要：
Rock crack propagation under underwater explosion loading is of great significance for explosive fracturing. In this study, the propagation process of shock wave generated by underwater explosions in infinite water and the failure process of rock were numerically simulated using the LS-DYNA and LS-PREPOST software. The implicit-explicit solution method of the LS-DYNA was used to analyze the influence of confining pressure on the crack propagation in rock under underwater explosion loading. The results show that the rock is mainly subject to tensile failure and shear failure, and cracks are mainly distributed in the corner of the upper and lower surface of the rock, and in the edge of the rock side surface. The initial confining pressure in each direction can inhibit the crack propagation in the plane perpendicular to the pressure direction. The increase of the initial stress in the same direction as the blasting load can reduce the crack propagation, and moreover, with the increase of the initial horizontal stress, the cracks in the corner can connect with the cracks in the edge of the rock side surface, and the range of crack propagation in the horizontal plane is large, even new cracks can be generated in the rock. Different from the drilling and blasting on land surface, the increase of confining pressure of underwater explosion loading can increase the crack density. © 2022 University of Petroleum, China. All rights reserved.
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页码：96 / 104
页数：8
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