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| Study on layout of mining roadway in close distance double thick coal seams with variable layer spacing |
| Guo Weiliang1, Chang Maomao1, Song Xiaohan2,3 |
| 1. Shaanxi Coal Group Xiaobaodang Coal Co., Ltd., Yulin 719000, China; 2. CCTEG Coal Mining Research Institute， Beijing 100013, China; 3. Tiandi Science ＆ Technology Co., Ltd., Beijing 100013, China |
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Abstract In the mining of close distance coal seams, in order to avoid the adverse stress environment caused by the mining of the upper coal seam, it is a more effective technical means to select a reasonable roadway layout. Based on the close-distance downward mining of No.6 upper coal seam and No.6 coal seam in Zhunqi Mine, the reasonable layout of mining roadway under the condition of variable layer spacing of close-distance double-thick coal seam was studied by means of numerical simulation, the law of stress conduction of interlayer coal pillar wasanalyzed, the stress environment of lower coal seam mining roadway under different layer spacing and layout modes was simulated, and the layout scheme of mining roadway in the first mining face and continuous working face of lower No.6 coal seam was designed. The roadway of the first mining face of No.6 coal seam adopted the internal staggered layout mode, and the subsequent working face adopted the translational layout mode. In order to take into account the roadway layout of the 6 coal working face under the condition of variable layer spacing, the distance of the 6 upper coal roadway on the same side of the 6 coal roadway should not be less than 30 m.
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