聚能射流地应力和延时协同作用下岩体损伤
Effects of in-situ stress and delay time on rock damage under shaped charge jet blasting
孟宁康 1柏建彪 2YOO Chung-sik 3陈勇2
作者信息
- 1. School of Mines,China University of Mining and Technology,Xuzhou 221116,China
- 2. State Key Laboratory of Coal Resources and Safe Mining(China University of Mining and Technology),Xuzhou 221116,China
- 3. School Civil Architectural Engineering Landscape Architecture,Sungkyunkwan University,Suwon 16419,Korea
- 折叠
摘要
地应力和时序性对聚能射流爆破岩体损伤有显著影响.本文理论分析了地应力爆破下炮孔周围岩体应力分布规律和爆破裂纹发育范围,运用数值模拟研究了各向同性和各向异性压力下岩体破碎区的形状、射流侵蚀长度和裂纹扩展特征,探讨了延时效应对裂纹扩展贯通的影响.结果表明,聚能射流爆破实现了裂纹定向扩展,提高了裂纹扩展长度.在各向同性压力下,破碎区呈圆形,破碎区半径、射流侵蚀长度和裂纹长度随着地应力的增加而减小.在各向异性的压力下,破碎区呈椭圆形;水平和垂直方向的压力差值越大,破碎区的各向异性就越明显.随着侧压系数k逐渐减小,水平和垂直方向裂纹长度分别呈减小和增加的趋势.炮孔垂直方向裂纹长度随延迟时间的延长而增加.本研究可为地应力条件下聚能射流爆破和延时效应对岩石损伤行为的发展提供理论指导.
Abstract
In-situ stress and delay time in shaped charge jet blasting(SCJB)have significant effects on rock damage.In this study,the stress distribution pattern and damage mechanism of rock around the blast hole under coupled in-situ stress and blast loading are studied using theoretical analysis and numerical simulation.The effect of SCJB on rock crushed zone,jet erosion length and crack propagation characteristics under in-situ stress was explored.The results show that the SCJB method achieves directional crack extension and increases the crack extension length.Under equibiaxial in-situ stress condition,the crushed zone is circular,and the radius of the crushed zone,jet erosion length and crack length decrease with increasing in-situ stress level.Under an anisotropic pressure condition,on the other hand,the crushed zone is elliptical;the greater the difference between horizontal and vertical pressure,the more pronounced the anisotropy of the crushed zone.As the lateral pressure coefficient k decreases,the horizontal crack length tends to decrease whereas the vertical crack length increases.The vertical crack length of the delay blast hole increases with the increase of the delay time.
关键词
聚能射流/地应力/裂纹扩展/延时爆破Key words
shaped charge jet blasting/in-situ stress/crack propagation/delay time引用本文复制引用
基金项目
National Natural Science Foundation of China(U21A20107)
National Natural Science Foundation of China(52074239)
National Natural Science Foundation of China(52174135)
Graduate Innovation Program and Postgraduate Research&Practice Innovation Program of Jiangsu Province,China(2022WLKXJ047)
Graduate Innovation Program and Postgraduate Research&Practice Innovation Program of Jiangsu Province,China(KYCX22_2617)
National Research Foundation of Korea(NRF-2021R1A2C3011490)
出版年
2023
NETL
NSTL
维普
万方数据