浅孔爆破在沿空留巷切顶卸压中的应用研究  

Study on Shallow Hole Blasting for Cutting Roof Pressure Relief in Gob-Side Entry Retaining

作　　者：徐军[1] 曹其嘉 孟宁康 XU Jun;CAO Qi-jia;MENG Ning-kang(Yangzhou Polytechnic Institute,Yangzhou 225127,China）（2.School of Mines,Key Laboratory of Coal Resources and Safe Mining,China University of Mining and Technology,Xuzhou 221116,China)

机构地区：[1]扬州工业职业技术学院,江苏扬州225127 [2]中国矿业大学矿业工程学院煤炭资源与安全开采国家重点实验室,江苏徐州221116

出　　处：《数学的实践与认识》2018年第20期256-261,共6页Mathematics in Practice and Theory

摘　　要：分析了浅孔爆破岩体裂隙分布和厚层坚硬顶板破断规律，提出采用浅孔爆破切顶卸压技术与充填体相结合的留巷方式，建立充填体切顶卸压力学模型，研究表明：相邻炮孔爆炸时，裂隙区相互贯通，留巷顶板强度降低，改善了沿空留巷顶板结构和应力环境，降低了充填体切顶阻力和宽度．以某煤矿11304工作面厚坚硬顶板沿空留巷试验工程为背景，利用LS-DYNA数值模拟，最终确定炮孔孔深3200mm、孔径42mm、间距850mm，充填体强度为6．5MPa，留巷巷内顶板保持完整，巷旁充填体维护效果良好．The fracture distribution of thick rock mass with shallow hole blasting and the hard breaking law of thick layer are analyzed in this paper. The method of retaining the roadway with the shallow hole blasting for cutting roof pressure relief and the filling body are putted forward, and the mechanical model of cutting roof pressure relief is established. The research results show that when the adjacent blasting is exploded, the crack area penetrates each other, and the strength of the roof is reduced, which improves the roof structure and stress environment of gob-side entry retaining, and reduces the damping resistance and width of the roadside backfill. With geological condition of thick and hard roof gob-side entry retaining in a coal mine 11304 working face as example, using the LS-DYNA numerical simulation, and ultimately determine the hole depth 3200 mm, diameter 42 mm, spacing of 850 mm, the strength of the filling body is 6.5 MPa. roadside packing body maintenance effect is good. The gob side entry retaining roof is intact, and the side filling body has good maintenance effect.

关 键 词：沿空留巷 浅孔爆破 充填体 炮孔间距 力学模型 切顶阻力 

分 类 号：TD353[矿业工程—矿井建设]