Cap rock blast caving of cavity under open pit bench  

露天台阶面下伏空区顶板的爆破崩落处理（英文）

作　　者：Xi-ling LIU Ke-bing LUO Xi-bing LI Qi-yue LI Wei-hua WANG Feng-qiang GONG 刘希灵;罗克冰;李夕兵;李启月;王卫华;宫凤强(中南大学资源与安全工程学院,长沙410083;深部金属矿产资源开发与灾害控制湖南省重点实验室,长沙410083)

机构地区：[1]School of Resources and Safety Engineering, Central South University, Changsha 410083, China [2]Hunan Key Laboratory of Resources Exploitation and Hazard Control for Deep Metal Mines,Changsha 410083, China

出　　处：《Transactions of Nonferrous Metals Society of China》2017年第3期648-655,共8页中国有色金属学报（英文版）

基　　金：Projects(51204206,41272304,41372278) supported by the National Natural Science Foundation of China

摘　　要：A laser technique based scanning system was employed to make a comprehensive scanning through borehole forunmapped cavity under open pit bench,then the three-dimensional data will be obtained,and these data were used for theoreticalanalysis and numerical simulation to analyze the stability of cap rock.Acoustic emission techniques were also adopted to carry outlong term real time rupture monitoring in cap rock.Therefore,a complete safety evaluation system for the cap rock was establishedto ensure safe operation of subsequent blasting processes.The ideal way of eliminating collapse hazard of such cavity is cap rockcaving through deep-hole blasting,thus,two deep-hole blasting schemes named as vertical deep-hole blasting scheme and one-timeraise driving integrated with deep-hole bench blasting scheme were proposed.The vertical deep-hole blasting scheme has moreexplosive consumption,but the relatively simple blasting net work structure can greatly reduce workloads.However,the one-timeraise driving integrated with deep-hole bench blasting scheme can obviously reduce explosive consumption,but the higher technicalrequirements on drilling,explosive charging and blasting network will increase workloads.基于激光三维扫描技术构建空区三维实体模型,运用理论分析和数值模拟的方法对空区上覆岩层的稳定性进行分析;采用声发射技术对空区上覆岩层进行跟踪监测,形成空区上覆岩层安全性的评价体系。同时,提出了运用垂直深孔爆破消空处理和一次成井及深孔爆破消空一体化处理两种空区处理方案,将两种方案进行对比分析后发现,垂直深孔爆破消空处理方案炸药单耗和总装药量较大,但其爆破网络结构简单,现场作业量小。而一次成井及深孔爆破消空一体化处理方案炸药单耗和总装药量小,但对钻孔精度、装药及爆破网络连接等都有较高的要求,现场作业量大。

关 键 词：open pit mining CAVITY laser 3D detection cap rock stability evaluation one-time raise driving deep-hole blasting 

分 类 号：TD327.2[矿业工程—矿井建设] TD235