覆岩结构裂隙数字式全景钻孔摄像观测分析

Digital panoramic borehole camera observation and analysis of overlying structure fractures

为掌握唐山矿T1091采煤工作面开采过程中的覆岩节理和裂隙的发育情况,采用数字式全景钻孔摄像系统,在工作面中部布置多个钻孔观测点。探测结果显示,缓倾角节理分布于探测范围的全部,中倾角节理分布于探测范围的中下部,陡倾角节理分布于探测范围的下部;距离工作面越近,开采后覆岩裂隙发育越明显,透水性越强;采动裂隙和节理倾角的变化和覆岩与工作面距离有关,受煤层采动影响,距离工作面越近,覆岩破坏越严重,碎裂度越大,节理倾角越大。

In order to investigate the development situation of overburden rock joints and fractures in T1091 work face at Tangshan Mine in the mining process,this paper used the digital panoramic borehole camera system to analyze and arrange multiple borehole observation points in the middle of the work face.The detection results showed that low-angle joints were distributed in the whole detection range,medium-angle joints were distributed in the middle and lower part of detection range,steep-angle joints were distributed in the lower part of detection range.The closer the work face was,the more obvious the fracture development of overlying strata after mining was,and the stronger the permeability was.Mining-induced fractures and joint dip angle were related to the distance between overburden strata and work face.Influenced by coal seam mining,the closer the distance from the work face was,the more serious the overburden failure was,the larger the fragmentation degree and the joint dip angle were.