Roof pre-blasting to prevent support crushing and water inrush accidents  

作　　者：Wang Xiaozhen Xu Jialin Zhu Weibing Li Yingchun 

机构地区：[1]State Key Laboratory of Coal Resources and Mine Safety, China University of Mining & Technology, Xuzhou 221008, China [2]School of Mines, China University of Mining & Technology, Xuzhou 221116, China

出　　处：《International Journal of Mining Science and Technology》2012年第3期379-384,共6页矿业科学技术学报（英文版）

基　　金：the National Natural Science Foundation of China (No. 50974116);A Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions (SZBF2011-6-B35) for their financial support

摘　　要：Support crushing and water inrush when mining under an unconsolidated confined aquifer in the Qidong Coal Mine was prevented by roof pre-blasting. The mechanism and applicable conditions for this method have been studied. The results show that when an overburden structure that may cause support crushing and a water inrush accident exists the weakening of the primary key stratum, which thereby reduces its weighting step, roof pre-blasting is both feasible and effective. If the position of the primary key stratum can be moved upward to exceed 10 times the mining height the possibility of support crushing and water inrush disaster caused by key stratum compound breakage will be lowered. The overburden structure of the number 7121 working face was considered during the design of a technical proposal involving roof pre-blasting. After comprehensively analyzing the applicability of roof pre-blasting the resulting design prevented support crushing and water inrush disasters from happening at the number 7121 working face and laid a solid foundation for mining safely.Support crushing and water inrush when mining under an unconsolidated confined aquifer in the Q idong Coal Mine was prevented by roof pre-blasting. The mechanism and applicable conditions for this method have been studied. The results show that when an overburden structure that may cause support crushing and a water inrush accident exists the weakening of the primary key stratum, which thereby reduces its weighting step, roof pre-blasting is both feasible and effective. If the position of the primary key stratum can be moved upward to exceed 10 times the mining height the possibility of support crushing and water inrush disaster caused by key stratum compound breakage will be lowered. The overburden structure of the number 7121 working face was considered during the design of a technical proposal involving roof pre-blasting. After comprehensively analyzing the applicability of roof pre-blasting the resulting design prevented support crushing and water inrush disasters from happening at the number 7121 working face and laid a solid foundation for mining safely.

关 键 词：Unconsolidated confined aquifer Support crushing and water inrush Roof pre-blasting Key stratum 

分 类 号：TD745.2[矿业工程—矿井通风与安全] TD823.97