某矿区带压开采逆断层活化及突水性分析  

Analysis on reverse fault activation and water inrush possibility for coal mining above confined aquifer in a mining area

作　　者：卜万奎[1,2] 徐慧[2] 

机构地区：[1]中国矿业大学深部岩土力学与地下工程国家重点实验室,江苏徐州221008 [2]菏泽学院机电工程系,山东菏泽274015

出　　处：《煤炭学报》2011年第7期1177-1183,共7页Journal of China Coal Society

基　　金：国家重点基础研究发展计划(973)资助项目(2007CB209400);深部岩土力学与地下工程国家重点实验室博士后基金资助项目(PD1005);菏泽学院科研基金资助项目(XY10BS04)

摘　　要：根据某矿区732工作面的实际地质特征,建立了力学模型,给出了断层位置法向应力和剪应力的计算公式,计算了该矿区在开采过程中F16逆断层面上的法向应力和剪应力,得出:随着732工作面的开挖,F16逆断层面产生附加法向应力和附加剪应力,附加的法向应力使得断层带内张性裂隙产生与发展,附加的剪应力使得断层带内剪切裂隙和断层两侧的剪节理张开,透水性增强。在此基础上,利用RFPA2D-Flow有限元软件模拟了732工作面开采过程中顶板破坏情况及底板渗流特征,结果表明:732工作面开挖过程中,由于F16逆断层浅部紧闭不导水以及底板页岩未破坏,对盘含水层到采场之间没有形成贯通的裂隙通道,奥灰水不能溃入采场,底板渗流量不足以发生突水危险。According to the geological characteristics of 732 working face in a mining area,a mechanical model was built,and the expression for normal stress and shear stress on the fault was given respectively.By calculating the normal stress and shear stress on F16 reverse fault in excavation process,it is obtained that additional normal stress and additional shear stress is produced.Additional normal stress makes the tensional fracture emergence and development within F16 fault,while additional shear stress makes the shear fracture opening within F16 fault and makes shear joint opening on both parts of F16 fault.These results lead to water permeability improved within F16 fault.On this basis,failure distribution of coal roof and seepage feature of coal floor was simulated by using RFPA2D-Flow software.The results show that there is no connected fracture channel between aquifer on other part and working face in excavation process,because the shallow depths of F16 reverse fault is compactly closed and shale on coal floor isn＇t destroyed.Ordovician limestone water can＇t burst into working face and the seepage flow on coal floor is not enough to lead to water inrush accident.

关 键 词：带压开采 逆断层 断层活化 突水 奥灰水 RFPA2D 

分 类 号：TD742.2[矿业工程—矿井通风与安全]