砂岩顶板水力致裂技术及应用
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摘要
南阳坡煤矿8704工作面顶板为粗砂岩,在回采过程中易出现悬板面积超标现象,通过增设孔底楔形槽在钻孔中注入高压水改变岩石局部的应力状态,使岩石定向断裂,同时确定水力致裂的钻孔参数。该矿运用高压水力致裂技术对顺槽顶板超前预裂,减小了端头三角区悬板面积、周期来压步距和来压强度。
The roof of 8704 working face in Nanyangpo Coal Mine is coarse sandstone, and the area of suspended slab is easy to exceed the standard during mining. By adding wedge-shaped groove at the bottom of the hole to inject high-pressure water into the borehole, the local stress state of the rock is changed, the rock is directionally fractured, and the drilling parameters of hydraulic fracturing are determined. The mine uses high pressure hydraulic fracturing technology to pre-crack the roof along the trough, which reduces the area of suspended plate, periodic weighting step and weighting strength in the end triangle area.
The roof of 8704 working face in Nanyangpo Coal Mine is coarse sandstone, and the area of suspended slab is easy to exceed the standard during mining. By adding wedge-shaped groove at the bottom of the hole to inject high-pressure water into the borehole, the local stress state of the rock is changed, the rock is directionally fractured, and the drilling parameters of hydraulic fracturing are determined. The mine uses high pressure hydraulic fracturing technology to pre-crack the roof along the trough, which reduces the area of suspended plate, periodic weighting step and weighting strength in the end triangle area.
引文
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[3]梁大海.坚硬顶板注水软化机理研究[D].太原理工大学,2006.
[4]常龙,田庆祝,周伟.煤矿开采过程中采煤工作面老顶初次来压步距及周期来压步距的计算方法[J].内蒙古煤炭经济,2013(10):94-96.
[5]张成宇.麻家梁煤矿临空巷道围岩大变形控制技术[J].煤炭与化工,2017,40(03):5-10.
[6]刘士强.关键层理论浅析[J].科技信息,2013(13):409.