综采工作面端头大面积悬顶控顶技术

为了降低采煤工作面端头顶板岩体强度,根据高压水对岩体的压裂理论,进行了高压水对岩体的压裂试验研究.试验结果表明,高压水对岩体的压裂是分层进行的,注水孔越深,高压水对岩层的软化效果越好;为了减少锚杆、锚索对顶板的加固作用和避免拉架过程中,支架顶梁、尾梁与锚杆、锚索紧固端发生摩擦、碰撞,产生火花,研究设计了拆除锚杆锚索紧固件的专用机具.在平煤集团一矿丁6-31050综采工作面综合采用了端头顶板高压注水处理和提前拆除锚杆锚索紧固件的技术措施,提高了原煤产量,增加了经济效益.

Roof control technology for large unsupported roof at face end of coal mining face

In order to reduce the roof strata strength at the face end of the coal mining face,according to the rock cracking theory with the high pressurized water,a rock cracking experiment study with high pressurized water was conducted.The test results showed that the rock cracking by the high pressurized water was made in layer and the deeper of the water injection borehole,the high pressurized water would have more better softening result to the rock strata.In order to reduce the bolt and anchor to the roof rein...