关键词: L型井, 采空区, 瓦斯抽采, 瓦斯浓度

Abstract: In order to strengthen the gas control of the 1301 (upper) coal mining face of Hudi Coal Industry, an L-shaped well was designed and implemented to extract the gas that gathers in goaf. The L-shaped well extraction process and drainage effect were analyzed and evaluated. The results show that: (1) the best location of L-shaped well is 9-12 times higher than the 3# coal seam; (2) the L-shaped well arrangement angle should be consistent with the coal seam inclination and be placed in the same layer as much as possible to avoid hole collapsing; (3) the L-shaped well should maintain a certain distance from the return air lane, and the optimal distance is 40-70m; (4) the L-shaped well can effectively reduce the gas concentration in the upper corner and the return flow of the working face, and the gas drainage effect is significant. The research results provide a good foundation and reference for the future design and construction of L-shaped wells.