顶板诱导崩落工程覆岩裂隙的空间分布规律与共轭现象  

Spatial distribution law and conjugation phenomenon of cracks in overlying strata in roof induced caving engineering

作　　者：陈庆发 林开汕 吴家有 周科平[2] 高峰[2] CHEN Qingfa;LIN Kaishan;WU Jiayou;ZHOU Keping;GAO Feng(College of Resources and Metallurgy,Guangxi University,Nanning 530004,China;School of Resources and Safety Engineering,Central South University,Changsha 410083,China)

机构地区：[1]广西大学资源环境与材料学院,广西南宁530004 [2]中南大学资源与安全工程学院,湖南长沙410083

出　　处：《中南大学学报（自然科学版）》2022年第10期4085-4095,共11页Journal of Central South University:Science and Technology

基　　金：国家“十五”科技攻关项目(2003BA612A-10-1)。

摘　　要：以广西铜坑矿92号矿体连续采矿顶板诱导崩落工程为背景,根据探测得到的覆岩裂隙数据,采用3DMine数字化软件构建覆岩裂隙的赋存模型,开展覆岩裂隙的空间分布规律分析。研究结果表明:在东西方向上,裂隙数量因覆岩厚度增大而呈现出由少至多的分布规律,覆岩裂隙的倾角分布呈现出高度的一致性,两帮预裂钻孔裂隙倾向于沿回采方向集中,崩顶钻孔裂隙倾向于发散;在深度方向上,裂隙数量分布呈现出先增后减的抛物线分布趋势,倾角、倾向无明显的分布规律;在回采方向上,裂隙数量在钻孔深度方向上显现出逐步减少的分布规律,顶板中部因受应力集中的影响而出现较多大倾角裂隙,预裂钻孔裂隙倾向于在回采方向集中,崩顶钻孔裂隙倾向于发散;覆岩裂隙同时存在共面共轭与对称共轭2种共轭现象。Based on the continuous mining roof induced caving project of No.92 orebody of Tongkeng Mine in Guangxi,and based on the overburden crack data obtained by detection,3DMine digital software was used to construct the occurrence model of overburden cracks,and the spatial distribution law of overburden cracks was analyzed.The results show that in the east-west direction,the number of cracks is distributed from less to more due to the increase of thickness of the overburden.The inclination distribution of the cracks in the overburden shows a high degree of consistency.The two pre-cracked boreholes tend to concentrate along the stopping direction and the cracks of collapsed boreholes tend to diverge.In the depth direction,the distribution of the number of cracks presents a parabolic distribution trend that first increases and then decreases,and there is no obvious distribution law of dip and inclination.In the direction of stopping,the number of cracks with large inclination angles gradually decrease in the direction of drilling depth.The middle part of the roof is affected by stress concentration,and there are many high-dip cracks.The pre-cracked borehole crack tends to concentrate in the direction of mining,and the collapsed borehole crack tends to diverge highly.There are two kinds of conjugation phenomena in the overlying fractures,i.e.,coplanar conjugation and symmetrical conjugate.

关 键 词：顶板诱导崩落 覆岩裂隙 空间分布规律 共轭现象 

分 类 号：TD853[矿业工程—金属矿开采]