关键词: 冲击地压矿井, 近距离煤层, 工作面布置, 被保护层, 水平错距, 层次分析法

Abstract: The protective layer mining is an effective means to prevent coal mine rockburst disaster. The layout of the working face of the protected layer is vital for the effect of pressure relief and rockburst reduction. Regarding the layout method of protected layer working face in mines with rock burst, taking the close coal seam of Hulusiu Coal Mine as the research object, the vertical load model of the semi-infinite plane body is established, and the distribution characteristics of the high stress zone of the coal body of the protected layer are analyzed theoretically, and the layout of the working face of the protected layer is simplified to the selection of optimal horizontal offset L of the working face, A method for optimizing the optimal horizontal offset L based on the analytic hierarchy process is proposed, that is, to construct the AHP structural model of optimal horizontal offset L, to solve the weight matrix of each factor layer relative to the target layer, to establish the FLAC2D numerical model and to solve the value range of the horizontal offset, and to calculate optimal horizontal offset L within the value range by weighting. The research results show that: ① there are three high stress areas in the coal body of the protected layer, including one side of the goaf coal body area, two sides of the goaf coal pillar area and the stress recovery area, and two stress reduction areas with symmetrical distribution; ② The value range of horizontal offset favorable for main roadway excavation, maintenance and mining of working face is L=50~75m, L=80~140m and L=40~100m respectively; ③ Based on the AHP method, the horizontal offset that is beneficial to the excavation, maintenance and mining of the main roadway as a whole is L=60m. The research results can provide a reference for the layout of the protected coal face in similar conditions.