断层对顶板型冲击矿压的影响  

Effect of Fault on Roof Rock Burst

作　　者：李志华[1] 窦林名[1] 牟宗龙[1] 曹安业[1] 巩思园[1] 王玉刚[1] 

机构地区：[1]中国矿业大学煤炭资源与安全开采国家重点实验室,江苏徐州221008

出　　处：《采矿与安全工程学报》2008年第2期154-158,163,共6页Journal of Mining & Safety Engineering

基　　金：国家自然科学基金项目(50474068;50490273;50074030);国家重点基础研究发展计划(973)项目(2005CB221504);教育部博士点基金项目(20030290017)

摘　　要：为了研究断层附近冲击矿压发生规律,必须了解断层附近顶板运动特征.本文分析了顶板运动对冲击矿压的作用,采用"砌体梁"理论研究了断层倾向对顶板平衡结构的影响.以济三煤矿6303面地质资料为背景,通过FLAC5.02D软件建立了相应的分析模型,模拟了煤层开采过程中断层对顶板运动的影响.结果表明:无论工作面是由断层下盘向断层推进,还是由断层上盘向断层推进,随着工作面距断层面距离的缩小,顶板稳定性变差.当工作面由断层下盘向断层推进时,在采动影响下断层易"活化",顶板岩体利用断裂结构面发生滑移、回转和破坏失稳,从而导致顶板型冲击矿压.当工作面从断层上盘向断层推进时,顶板岩体易于形成平衡结构,顶板下沉量较小,顶板运动较为平缓,断层冲击矿压的危险性就会小的多.通过对比分析,可确定当工作面从正断层下盘向断层推进时冲击矿压的危险性远高于工作面从上盘向断层推进时的危险性.In order to study the rule of rock burst near faults, it is necessary to fully understand the movement characteristics of roof. The action of roof movement on rock burst is analyzed, and voussior beam theory is used to explain the effects of faults with different dip directions on roof balance structure. According to the geological conditions of No. 6303 working face in Jisan coal mine, the FLAC5.0^2D software is used in establishing a relevant model to study the effect of faults on roof movement during coal mining operation. The results show that the stability of roof becomes poor with reduction of distance away from the fault whether the working face is mined in the footwall or hanging wall of fault. The roof rock-mass is apt to have a sliding, ro- tation, and destabilization because of the mining induced fault plane when the working face advances from the footwall of fault to the fault itself, leading to roof rock burst. However, when working face advances from the hanging wall to the fault itself, the roof rock-mass is ease to become a balanced structure, the movement of the roof is smooth, and the displacement is very small, resulting in a very small risk of fault rock burst. Therefore, the risk of fault rock burst when working face advances from the footwall to the fault itself is higher than that from the hanging wall to the fault itself.

关 键 词：断层 顶板 冲击矿压 数值模拟 平衡结构 

分 类 号：TD324.1[矿业工程—矿井建设]