采矿与安全工程学报Issue(2)：253-259,7.DOI:10.13545/j.cnki.jmse.2015.02.013
带有导向孔的浅孔爆破在留巷切顶卸压中的应用研究
Study on the application of short-hole blasting with guide hole to roof cutting pressure relief of gob-side entry retaining
摘要
Abstract
Roof cutting pressure relief is one of effective ways for optimizing the surrounding rock stress and structure in thick layer of hard roof, and the application of guide hole to roof cutting pressure relief is a new attempt. Based on the mechanism of short-hole blasting for roof cutting pressure relief in gob-side entry retaining, using the combination of LS-DYNA numerical simulation and theoretical analysis, mechanism of guide hole has been analyzed, and the effect of the selection of parameters on the blasting of rock mass has been explored. The results show that free surface of blast hole increases in the guide hole, which affects obviously to the tangential stress, and increases the fracture penetration rate and utilization rate of explosive energy;The guide will give full play to the role as stress concentra-tion when charging hole non-coupling coefficient is 1.31;There is a positively change relationship between maximum tangential tensile stress and guide hole diameter,but it has little effects on the posi-tion away from the guide hole. According to the dynamic tensile strength of the rock, the charging hole spacing is determined as 1.2 m.关键词
导向孔/沿空留巷/浅孔爆破/切顶卸压Key words
guide hole/gob-side entry retaining/short-hole blasting/roof cutting pressure relief分类
矿业与冶金引用本文复制引用
陈勇,郝胜鹏,陈延涛,张自政,武立飞,刘洪林..带有导向孔的浅孔爆破在留巷切顶卸压中的应用研究[J].采矿与安全工程学报,2015,(2):253-259,7.基金项目
煤炭资源与安全开采国家重点实验室自主研究课题项目(SKLCRSM13X07)；国家自然科学基金项目(51174195)；煤炭资源与安全开采国家重点实验室开放研究基金项目(11KF01)；江苏省自然科学基金项目(BK20140210) （SKLCRSM13X07）
