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针对祁东煤矿松散承压含水层下采煤压架突水问题,结合8_222工作面的地质采矿条件,对初采期调斜开采过程中的覆岩破坏特征进行了模拟。结果表明:在初采期调斜开采情况下,顶板关键层悬露形状为三角形,开采尺寸较大的区域悬露到一定程度后,首先发生破断并造成工作面局部来压,随着调斜尺寸的增加,工作面基本顶能够分区域破断,使得局部来压区域逐步向工作面中部和机尾转移,从而避免了高水压作用下采场顶班初次破断引发的大面积同时来压甚至压架问题。因此在条件允许情况下,高承压含水层下开采时可将切眼布置为伪斜状态。
According to the geological mining conditions of 8_222 working face, the failure characteristics of overlying strata during the initial recovery period are simulated in light of the problem of water ram in coal ram under the unconsolidated confined aquifer in Qidong Coal Mine. The results showed that the diagonal mining of the key roof of the roof was triangular when the mining was carried out in the initial mining period. After the area with the larger mining size was exposed to a certain extent, the fracture occurred first and then the pressure was locally applied on the working face. As the size increases, the basic roof of the working face can be broken up in different regions so that the local pressure area gradually shifts to the middle part and the tail of the working face so as to avoid the large area pressure caused by the initial breaking of the top working face under the action of high water pressure. Pressure rack problem. Therefore, under the conditions permitting, cuttings can be arranged in pseudo-oblique state when mining under high confined aquifer.