摘要
六采区6303工作面回采3下煤层,基本顶为坚硬稳定的中砂岩,平均厚度23m左右。其冲击特点是,冲击发生后顶板与煤层离层、顶板完整没有破碎,冲击与顶板周期运动一致,冲击矿震后部分十字铰接顶梁支柱震歪、震断,十字铰接顶梁被震断。试验表明,单纯煤样和煤岩样组合均为弱冲击倾向性,煤岩组合的动态破坏猛烈。故可确定该区域的冲击矿压为顶板型(冲击型)和顶板煤层型。对于该类冲击矿压,可采用钻孔卸压、煤体爆破卸压和顶板爆破等三种措施解危。
Basic roof of 3F coal seam which is mined in 6303 mining face is hard and steady sandstone with the average thickness of 23 m. The characteristics of its rock burst were that the roof and coal separated and the roof kept integrity, and the rock burst usually hap- pened during the cyclic weighting. After the rock burst, some cross-articulated supports were shook askew and broken off, the cross-articulated top girders broke off. According to the index of bump proneness of coal and rock, weak bump proneness existed in the pure coal and in composed coal and rock, and the dynamic failure process of composed coal and rock was violent. Therefore, the rock burst type of the area is confirmed to roof type and roof-coal type. To this rock burst type, the dangerous area can be handled with next three danger-breaking measures include unload with borehole, reliving shot for coal and reliving shot for roof.
出处
《煤矿开采》
2007年第2期58-61,共4页
Coal Mining Technology
