冲击危险区迎采沿空巷道切顶护巷防冲技术
Preventing rock burst technology by roof cutting and roadway protection in mining along goaf roadway of dangerous area
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摘要: 为了解决张双楼煤矿冲击危险区迎采沿空巷道的巷道变形问题，以92606综采工作面为研究对象，采用理论分析的方法研究了爆破切顶护巷技术；并针对92606工作面的实际情况确定了顶板爆破孔深度为3.3~12.6 m，2个炮孔间距要小于等于1 m，切顶效果较好；同时对92606工作面提出了4种防冲控制方案。根据现场情况对其进行对比分析，得出当孔深8 m和6 m，间距0.5 m，在竖直方向上进行爆破的过程中，爆破面下部隅角一般都不存在悬顶，顶板与支架在爆破时一同脱落；这时可以进行顶板的切顶工作，就可以在一定程度上对92606工作面隅角悬顶，以及在沿空巷道方向上的采动形变进行控制。Abstract: In order to solve the problem of roadway deformation of gob-side entry driving in the dangerous area of Zhangshuanglou Coal Mine, taking 92606 working face as the research object, the technology of blasting and roof cutting is studied by means of theoretical analysis, and according to the actual situation of 92606 working face, the depth of roof blasting hole is determined to be 3.3 m to 12.6 m, the distance between two blasting holes is less than or equal to 1 m, and the effect of roof cutting is good. At the same time, four kinds of preventing rock burst control schemes are proposed for 92606 working face. According to the comparison and analysis of the field situation, when the hole depth is 8 m and 6 m, the spacing is 50 cm, and the blasting is carried out vertically and upward, there is basically no suspended roof at the lower corner of the working face, and the roof collapses with the support. Through the roof cutting, the mining deformation of the corner hanging roof and the gob side roadway of 92606 working face are effectively controlled.
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