为进一步了解山西A矿 15105 工作面覆岩导水裂隙带发育规律,基于该工作面工程地质概况,进行相似模拟试验分析,结合声发射技术与钻孔窥视技术进行研究.研究发现:该工作面覆岩破断具有较显著的非对称性,且裂隙带的主要分布方式为"梯形"+"倒V形";工作面上方岩层 500 mm范围内易发生声发射事件;导水裂隙带随"梯形"上顶边及右腰线的延升呈现扩展状态;钻孔窥视发现,裂隙带发育高度约为 41.72 cm,所对应的实际高度约为 83.44 m.
Development Law of Water-conducting Fracture Zone in Overburden Rock under Influence of Mining Stress
In order to further understand the development law of water-conducting fracture zone in overlying rock of 15105 working face of A Mine in Shanxi Province,similar simulation test analysis was carried out based on the engineering geology of the face,and the study was carried out combined with acoustic emission technology and borehole peeking technology.It was found that the overburden fracture of the working face had a significant asymmetry,and the main distribution mode of the fracture zone was"trapezoid"+"inverted V shape";acoustic emission events were easy to occur within 500 mm of the rock layer above the working face;with the extension of the top edge and the right waist line of the trapezoid,the water-conducting fissure zone expandeed;it was found by borehole peeking that the height of the fracture zone was about 41.72 cm,and the corresponding actual height was about 83.44 m.
mining stressoverburden rockwater-conducting fracture zonedevelopment law
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