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| Study on reasonable layout of roadway under coal pillar in left section of close distance coal seam |
| Li Fei |
| Wangjiazhai Mine of Guizhou Shuicheng Mining Holding Group Co., Ltd., Liupanshui 553000, China |
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Abstract No.7 coal seam in Wangjiazhai Coal Mine has been mined out. In order to determine the layout position of No.8 mining roadway under the influence of No.7 residual section coal pillar, the stress and displacement distribution characteristics of roadway under different internal dislocation distances were analyzed by numerical simulation. The conclusions were as follows : ①The vertical stress of No.8 coal seam reached the peak value under the residual coal pillar, which was about 4.4 times of the original rock stress, and the influence range was 13 m from the center of the coal pillar. ②With the increase of the internal dislocation distance of the roadway, the influence of the remaining section coal pillars above the roadway gradually decreased. When the internal dislocation distance was greater than 6 m, the roadway was located in the pressure relief area, and the reasonable internal dislocation distance of the roadway was determined to be 6 m. ③The deformation of roadway surrounding rock measured in the field was analyzed. The deformation of roadway surrounding rock was small as a whole, which was within the controllable range, which verified the rationality of the selection of staggered distance in roadway. This technology provided reference for similar mines.
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