Shenhua Shendong Coal Group Corporation Limited

为解决神东矿区7.0 m大采高综采工作面的安全高效开采问题,采用现场实测、理论分析和物理模拟的手段,对19个特大采高工作面的矿压规律和关键技术进行研究。研究结果表明:特大采高工作面矿压显现较普通采高工作面更加强烈;由于特大采高工作面采高明显增大,覆岩第一亚关键层易进入垮落带,难以形成“砌体梁”结构,而呈“悬臂梁”结构周期性破断,形成工作面的周期来压,其持续长度与支架控顶距接近,较关键层“砌体梁”结构来压持续长度明显偏大;并且随着埋深的增大,高位关键层的破断对特大采高工作面矿压显现的影响也逐渐加大,多关键层的同步破断显然会传递更大的覆岩载荷,进而加剧了工作面矿压显现。针对特大采高工作面的矿压显现特征与特殊的覆岩破断规律,建立了支架合理工作阻力的确定方法,研发了特大采高工作面开采设备,开发了大断面巷道支护技术、强制放顶技术和末采快速贯通技术,实现了特大采高工作面的安全高效开采。

In order to solve the safety and high efficiency mining problems of 7 m mining height fully-mechanized working face in Shendong Mining Area, the field m easurement, theoretical analysis and physical simulation methods were used to study the 19 ultra large mining height working faces of rock pressure law and key techn ology. The research results showed that compared with ordinary working face the strata behavior of the ultra large mining height working face more intense; because of ultra large mining height working face increased obviously, the No. 1 sub key strata entered the caving zone easily, it was difficult to form the structure of voussoir bea m, and the cantilever beam structure of periodic breaking the pressure to work, the formation period, the duration and distance of support roof to the key strata structur e of voussoir beam pressure persistence length was larger; and with the increase of buried depth, high key strata breaking was also gradually increasing influence on ul tra large mining height working face, synchronous breaking it would pass off overlying strata load more key layer, there by increasing the working face. Aiming at ultra I arge mining height working face of strata behavior characteristics and special rock breaking law.The author established a method to determine the reasonable working「 esistance of support, development of mining equipment of ultra large mining height working face, the support technology of large cross section tunnel, forced caving tec hnology and rapid through technology during terminal mining technology to achieve safe and efficient mining of ultra large height working face.