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为了提高顶板离层水害防治效果,分析了离层水害形成的必要条件。采用力学分析的方法,结合关键层理论,推导出主采煤层覆岩中产生离层的判别式。研究表明:离层水害的形成取决于离层的形成、离层发育位置、离层补给水源和可积水离层空间持续时间。离层沿工作面推进方向的长度、离层发育高度、离层与煤层垂向距离、离层中心距工作面开切眼距离及工作面推进距离等5个参数确定了离层空间尺寸,该尺寸的大小控制了离层水的水量。以宁夏某煤矿综采工作面为例,分析了该矿顶板次生离层水形成的层位、储水空间大小。
In order to improve the effect of prevention and control of roof delamination water damage, the necessary conditions for the formation of delaying water damage were analyzed. By means of mechanical analysis and key-layer theory, the discriminant of ionosphere in the overburden of the main coal seam is deduced. The results show that the formation of water damage depends on the formation of delamination, the location of delamination, the duration of delaying water supply and the delamination space. Departure space dimensions were determined by five parameters including the length of advancing along the working face, the height of the detachment, the vertical distance between the detachment and the coal seam, the distance between the detachment center and the working face and the advancing distance of the working face The size of the size control the amount of water from the separation of water. Taking a fully mechanized mining face in a coal mine in Ningxia as an example, the strata and water storage space of the secondary dewatering water in the mine roof are analyzed.