摘要
为解决辛安矿907工作面开切孔揭露坚硬全岩断层导致采煤机截割困难的问题,采用深孔预裂爆破理论,分析了爆炸荷载对断层的破坏作用,并设计了钻孔直径、钻孔深度、装药量、封孔长度和安全振动控制等爆破参数。运用LS-DYNA软件,开展断层爆破参数数值模拟,计算结果显示,炸药爆炸作用的有效范围约为7 m×22 m×2.7 m,在作用区域内应力叠加的作用下,产生远大于岩石的动态抗拉强度的应力,使岩体破碎。根据模拟结果优化爆破参数,并进行现场试验。试验效果表明,爆破后钻孔壁产生了不同长度和宽度的裂缝,形成了裂缝集中区域,基本达到了深孔预裂爆破破碎岩石的目的。采用深孔预裂爆破技术过断层有效地改善了采煤机作业环境,减少了50%的采煤机截齿消耗。
In order to solve the problem of shearer cutting difficulty caused by the 907 working face in Xin'an Coal mine,the theory of deep hole pre-splitting blasting was adopted to analyze the damage effect of explosion load on the fault,and the blasting parameters such as borehole diameter,borehole depth,charge quantity,hole sealing length and safety vibration control were designed.Through the LS-DYNA software,the numerical simulation of fault blasting parameters was carried out.The calculation results show that the effective range of explosive explosion is about 7 m×22 m×2.7 m.Under the action of stress superposition in the action area,the stress which is much larger than the dynamic tensile strength of rock is generated,and the rock mass is broken.The blasting parameters were optimized according to the simulation results,and the field test was carried out.The test results show that after blasting,cracks of different lengths and widths are produced in the borehole wall,and the crack concentration area is formed,which basically achieves the purpose of crushing rock by deep-hole pre-splitting blasting.The deep hole pre-splitting blasting technology is adopted to improve the working environment of shearer and reduce the consumption of shearer's pick by 50%.
作者
梁冰
董鹏程
李刚
郝建峰
杨庆贺
LIANG Bing;DONG Peng-cheng;LI Gang;HAO Jian-feng;YANG Qing-he(School of Mechanics and Engineering,Liaoning Technical University,Fuxin 123000,Liaoning,China;School of Mining Institute,Liaoning Technical University,Fuxin 123000,Liaoning,China)
出处
《工程爆破》
CSCD
北大核心
2023年第2期51-60,共10页
Engineering Blasting
基金
国家自然科学基金资助项目(51774165)。
关键词
深孔预裂爆破
数值模拟
爆破参数设计
坚硬岩石
过断层
deep hole presplit blasting
numerical simulation
blasting parameter design
hard rock
fault crossing
