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针对神东矿区大柳塔矿22202工作面可能存在顶板剧烈来压和压架事故等问题,采用理论分析和数值模拟方法研究长壁开采应力演化规律及压架机理。结果表明,工作面进入房采煤柱下方后,支承应力峰值点超前工作面距离会显著减小,造成顶板应力和超前支承峰值应力叠加,使应力集中更加明显。当工作面处于煤柱正下方时,如果顶板来压,在集中应力共同作用下将引发压架事故;在房采煤柱采空区边缘顶板运动不稳定,压架发生的规律性差;远离采空区边缘后,顶板来压的周期性明显,压架事故将会周期性地发生。
In view of the possible problems of severe roof pressure and pressure racking on the working face 22202 of Daliuta Mine in Shendong Mining Area, the stress evolution law and pressure-holding mechanism of longwall mining are studied by theoretical analysis and numerical simulation. The results show that the distance between the working face and the coal face ahead of the coal pillar can be significantly reduced, leading to the superimposition of the roof stress and the peak stress of the leading bearing, which makes the stress concentration more obvious. When the working face is directly below the coal pillar, if the roof to pressure, under the combined stress will lead to pressure racking accident; roof coal mining mined-out area at the edge of the roof unstable motion, pressure racking occurred poor; away from the mining After the edge of the empty area, the periodicity of the roof pressure is obvious, and the rail accident will happen periodically.