关键词: 超大采高工作面, 导水裂隙带, 精准防治水

Abstract: As one of the main coal bases in China, Shendong mining area provides an important support for the development of coal energy in China. Many major technological breakthroughs in the coal industry come from Shendong Coal Group, including the 8.8m mining height coal seam of Shangwan Coal Mine. However, the 8.8m mining height working face will inevitably cause the violent movement of overlying strata, lead to the development of overlying fissures, provide flow channels for the surface and aquifer water, and become the potential danger of mine safety production. Based on the engineering practice of working face No.12402 with large mining height in Shangwan Coal Mine, and on the basis of analyzing the hydrogeological conditions of the working face, this paper selects the key control area of water prevention and control, establishes the numerical model of the working face with large mining height by using the discrete element software, and studies the development law of the height of the water conducting fracture zone in the overlying strata during the mining process of the working face with large mining height. The results show that the height of the water conducting fracture zone is 95.02~112.00 m, which can connect to the surface, and the surface subsidence deformation reaches 7.19 m. In the season of heavy rainfall, it must have an impact on the water prevention and control work; along the working face, the water diversion fracture of the overlying strata tends to be "saddle shaped" distribution. Due to the compaction of the central area of the goaf, the overlying area corresponding to the trough of the super high working face becomes the key point of the water prevention and control work. Based on the above research results, the surface water and loose aquifer water prevention and control measures are formulated from the aspects of water source distribution and underground drainage facilities. The surface water is discharged in advance and the collapse pit is backfilled, the bedrock aquifer is discharged underground, and the standby drainage facilities are arranged within 200m of the return air way, which provides a strong guarantee for the safe mining of the working face.