不同地应力条件下水耦合装药爆破性能研究
Performance of water-coupled charge blasting under different in-situ stresses
周子龙 1王振 1程瑞山 2蔡鑫 1蓝日彦3
作者信息
- 1. School of Resources and Safety Engineering,Central South University,Changsha 410083,China
- 2. Center for Infrastructural Monitoring and Protection,School of Civil and Mechanical Engineering,Curtin University,Bentley,Australia
- 3. Guangxi Xinfazhan Communication Group Co.,Ltd.,Nanning 530000,China
- 折叠
摘要
水耦合装药爆破是一种很有前途的高效破岩技术.本文利用LS-DYNA建立了双孔水耦合装药的数值模型,并通过岩石爆炸试验对其进行了标定,以检验其性能.首先,对水耦合装药爆破和空气耦合装药爆破诱发的岩体裂隙扩展情况进行了比较.结果表明,水耦合装药爆破比空气耦合装药爆破更适合深部岩体的破碎.此外,还研究了岩石性质、水耦合装药系数和炮孔连接角度对地应力作用下水耦合装药爆破的影响.结果表明,岩石性质和水耦合装药系数对等轴地应力和非等轴地应力作用下水耦合装药爆破诱发的岩体破碎和裂隙扩展有很大的影响.然而,改变炮孔连接角度只会影响非等轴地应力条件下岩体的破碎裂纹和扩展,而在等轴地应力作用下几乎没有影响.最后,提出了考虑上述因素的计算公式,为不同地应力条件下的水耦合装药爆破破岩提供了设计建议.
Abstract
Water-coupled charge blasting is a promising technique to efficiently break rock masses.In this study,numerical models of double boreholes with water-coupled charge are established using LS-DYNA and are calibrated by the tests of rock masses subjected to explosion loads to examine its performance.The crack levels of rock mass induced by water-coupled charge blasting and air-coupled charge blasting are first compared.It is found that water-coupled charge blasting is more appropriate to fracture deep rock mass than air-coupled charge blasting.In addition,the effects of rock properties,water-coupled charge coefficients,and borehole connection angles on the performance of water-coupled charge blasting are investigated.The results show that rock properties and water-coupled charge coefficients can greatly influence the crack and fragmentation levels of rock mass induced by water-coupled charge blasting under uniform and non-uniform in-situ stresses.However,changing borehole-connection angles can only affect crack and fragmentation levels of rock mass under non-uniform in-situ stresses but barely affect those under uniform in-situ stresses.A formula is finally proposed by considering the above-mentioned factors to provide the design suggestion of water-coupled charge blasting to fracture rock mass with different in-situ stresses.
关键词
水耦合爆破/地应力/水耦合装药系数/岩石类型/炮孔连接角度Key words
water-coupled blasting/in-situ stress/water-coupled charge coefficient/rock type/borehole-connection angle引用本文复制引用
基金项目
National Natural Science Foundation of China(52334003)
National Natural Science Foundation of China(52104111)
National Natural Science Foundation of China(52274249)
National Key R&D Project of China(2022YFC2903901)
Natural Science Foundation of Hunan Province,China(2024JJ4064)
出版年
2024
NETL
NSTL
万方数据