超大采高综采工作面在经过不同地质条件岩层时矿压显现规律存在差异,为了深入研究顶板压力不同对煤壁及生产组织的直接影响,以上湾煤矿12403综采工作面过地表石灰沟为工程背景进行研究,通过分析过石灰沟期间生产情况、比较过石灰沟前和过石灰沟期间不同的矿压显现规律,并得出煤壁塑性破坏程度变小的根本原因是工作面埋深在变小。研究表明:煤壁塑性破坏程度小,煤机割煤阻力大,要做好检修保养工作,保护好煤机;煤壁齐直无片帮时,可采取护帮板不贴煤壁的办法,降低对煤壁的支护强度;煤机在两端头斜切进刀时,煤机要退到合适位置,避免煤机进刀不力;煤机司机控制好底板提卧量,避免损耗煤机;水力压裂技术措施在宏观上应能降低煤壁发生塑性破坏的程度,减小煤机的割煤阻力;为保证两端头三角区采空区顶板能够及时垮落,两端头均进行超前退锚。

In order to study the direct influence of different roof pressures on the coal wall and production organization, the mine pressure pattern differs in the super high mining face when advancing beneath different geological conditions of the rock strata. The production situation was analyzed when advancing beneath lime gully, and the different mine pressure behaviors before and during the period was compared. It was concluded that, the root cause of the decreasing degree of plastic damage of the coal wall is the decrease in the working face depth. Research shows that the smaller degree of plastic damage to the coal wall, the greater the resistance of the coal shearer to cutting coal, so attention shall be paid to the maintenance of coal shearer; When the coal wall is straight and there is no rib spalling, it can be used to reduce the support strength of the coal wall by not sticking to the coal wall; When the coal shearer is cutting diagonally into at both ends, the coal shearer should be moved to the right position to avoid overloading; Coal shearer drivers should control the amount of floor digging to avoid damaging the coal shearer; Hydraulic fracturing measures can reduce the degree of plastic damage of the coal wall and reduce the resistance of the coal shearer to coal cutting; In order to ensure that the roof of the triangle at both ends can collapse in time, both ends are anchor retreated in advance.