爆炸载荷下邻近巷道围岩平行裂纹扩展规律试验研究  

Experimental study on growth law of the parallel cracks in the surrounding rock of roadway under explosion load

作　　者：张志勇 刘康[2] 郭东明[2] 张伟[2] ZHANG Zhiyong;LIU Kang;GUO Dongming;ZHANG Wei(Yongcheng Coal and Electricity Holding Group Co.,Ltd.,Yongcheng 476610,Henan,China;School of Mechanic & Civil Engineering,China University of Mining & Technology(Beijing),Beijing 100083,China)

机构地区：[1]永城煤电控股集团有限公司,河南永城476610 [2]中国矿业大学(北京)力学与建筑工程学院,北京100083

出　　处：《河南理工大学学报（自然科学版）》2019年第6期17-23,共7页Journal of Henan Polytechnic University（Natural Science）

基　　金：国家重点研发计划项目(2017YFC0804204-04);国家自然科学基金面上项目(51274204)

摘　　要：爆炸载荷下邻近巷道围岩的破坏往往表现为围岩裂纹扩展贯穿,为了更深入地了解爆炸载荷下邻近巷道围岩原有裂纹的扩展贯穿机制,以便提出有针对性的围岩防护措施,采用数字激光动态焦散线试验系统,详细研究了两平行裂纹的贯穿过程。结果表明:爆源、巷道自由面以及原有裂纹间的相互作用是影响裂纹扩展贯穿过程的主要因素,爆炸载荷下邻近巷道围岩裂纹扩展主要包括爆生主裂纹与原有裂纹的扩展贯穿以及原有裂纹间的扩展贯穿,且在贯穿过程中伴随有能量的传递;爆炸载荷下,爆源处诱发爆生主裂纹与相距较近的围岩原有裂纹贯穿,并继续沿原爆生主裂纹扩展方向,即炮孔径向扩展,形成爆炸能量释放的主线,其他薄弱区域能量释放明显被削弱;当原有两裂纹邻近尖端存在相互影响区时,距离爆源较远的原有裂纹翘曲向距离爆源较近的原有裂纹。The damage of the surrounding rock of roadway under explosion load is often manifested as the growth and penetration of the cracks in the surrounding rock.In order to deeply understand the growth process and mechanism of original crack in the surrounding rock under the adjacent explosion load and put forward specific protective measures,the experimental system of digital laser dynamic caustic line was adopted to research the penetration process of both parallel cracks.The results showed that the explosion source,the free surface of the roadway and the interaction of original cracks were the main factors affecting the crack growth and penetration process.The growth of the crack in the surrounding rock under the adjacent explosion load was mainly characterized by the penetration between the explosion crack and the original crack,and the penetration among the original cracks.The transfer of energy was accompanied during the penetration process.Under the explosion load,the explosion crack from the explosion source penetrated the crack in the surrounding rock,and continued to grow along growth direction of original explosion crack,i.e.the radial direction of the blasthole.Meantime the main line of explosive energy release was formed,and the energy release of other weak areas would be significantly weakened.When the two original cracks had an interaction zone in the adjacent tip,the original crack farther away from the explosion source growed towards to the original crack,which was closer to the explosion source.

关 键 词：爆炸载荷 巷道围岩 原有裂纹 扩展规律 动态焦散线方法 

分 类 号：TD23[矿业工程—矿井建设]