邢东矿深部带压开采导水裂隙带微震监测及突水机制分析  

Micro-seismic monitoring on fractured zone and water inrush mechanism analysis of deep mining above aquifer in Xingdong coalmine

作　　者：孙运江[1] 左建平[1,2] 李玉宝[3] 刘存辉[1] 李彦红[1] 史月[1] SUN Yun-jiang ZUO Jian-ping LI Yu-bao LIU Cun-hui LI Yan-hong SHI Yue(School of Mechanics and Civil Engineering, China University of Mining ＆ Technology （Beijing）, Beijing 100083, China State Key Laboratory of Coal Resources and Safe Mining, China University of Mining ＆ Technology, Beijing 100083, China Hebei Coal Science Research Institute, Xingtai, Hebei 054000, China)

机构地区：[1]中国矿业大学(北京)力学与建筑工程学院,北京100083 [2]中国矿业大学煤炭资源与安全开采国家重点实验室,北京100083 [3]河北煤炭科学研究院,河北邢台054000

出　　处：《岩土力学》2017年第8期2335-2342,共8页Rock and Soil Mechanics

基　　金：国家优秀青年科学基金(No.51622404);国家自然科学基金(No.51374215;No.11572343);"十三五"国家重点研发计划(No.2016YFC0801404);"万人计划"青年拔尖人才联合资助项目~~

摘　　要：针对邢东矿2222工作面深部带压开采接近临界值且局部受隐伏断层等构造影响,可能出现底板突水的问题,采用ESG微震监测系统实时监测导水裂隙带形成过程,并利用研发的CMMA-3D微震分析系统获得了2222工作面底板导水裂隙带的空间位置,为针对性注浆治理和安全开采提供了重要指导。基于断裂力学分析了隐伏断层活化突水机制,推导出隐伏断层扩展长度计算公式。获得了不同类型隐伏断层(正断层和逆断层)的扩展规律:正断层扩展长度(35)l与承压水压力p和侧压系数?均呈正相关;逆断层扩展长度?l随承压水压力p的增加呈现出先减后增的变化趋势。底板导水裂隙带渗透性随采空区垮落岩体压实度的增加而降低,阐明了2222工作面突水量后期逐渐减小的原因。The floor water inrush coefficient ofNo.2222 mining face is close to the critical value and a high possibility of floor water inrush occurs due to insidious faults in Xingdong coal mine. This paper aims at solving the above problem, and ESG micro-seismic monitoring system was applied to monitor the forming process of water inrush pathway. Besides, the space location of water inrush pathway was obtained by a developed micro-seismic analysis system CMMA-3D. Hence, this provides significant guidance for targeted grouting and safe mining above the confined aquifer. The mechanism of water inrush through insidious faults was analyzed based on fracture mechanics and then a formula was deduced to calculate insidious fault propagation length. The propagation laws of different types of faults, including normal fault and reverse fault, were achieved. When the insidious fault is a normal fault, its propagation length AI is positively correlated with confined water pressure p and lateral pressure coefficient 2. When the insidious fault is a reverse fault, its propagation length AI presents the variation tendency of decrease-increase with the increase of confined water pressure p. The permeability of floor fractured zone decreases with the increase of compaction degree of caving rocks, which reveals the reason for water irruption reduction of a later stage in No.2222 mining, face.

关 键 词：深部带压开采 突水通道 微震监测 隐伏断层 

分 类 号：TD315[矿业工程—矿井建设]