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Pressure reduction mechanism and effect of working face passing through abandoned roadway by roof presplit
Energy Science & Engineering ( IF 3.5 ) Pub Date : 2020-07-26 , DOI: 10.1002/ese3.760 Yunlou Du 1, 2, 3 , Guorui Feng 1, 2 , Yujiang Zhang 1, 2, 4 , Xihong Zhang 3 , Yingda Zhai 1, 2 , Jinwen Bai 1, 2
Energy Science & Engineering ( IF 3.5 ) Pub Date : 2020-07-26 , DOI: 10.1002/ese3.760 Yunlou Du 1, 2, 3 , Guorui Feng 1, 2 , Yujiang Zhang 1, 2, 4 , Xihong Zhang 3 , Yingda Zhai 1, 2 , Jinwen Bai 1, 2
Affiliation
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Due to the existence of abandoned roadways in the thick coal seam, the ground pressure would increase greatly due to the roof advanced breaking when the working face passed through the affected area of abandoned roadways. In order to solve this problem, a solution for roof presplit in the abandoned roadway was proposed. Based on the mining and geological conditions of Huasheng Hufeng coal mine, the roof vertical stress and vertical displacement with different roof presplit distance were analyzed by using FLAC3D numerical software. The research results indicated that the roof vertical stress and vertical displacement could be reduced effectively by roof presplit. When the roof presplit distance was 15 m, the maximum vertical stress and the maximum vertical displacement were both minimum. The maximum vertical stress was reduced by 14.55% and the maximum vertical displacement was reduced by 37.51% after roof presplit. The reasonable roof presplit distance of the working face was determined to be about 15 m by combining theoretical and numerical analysis. The engineering application results indicated that the maximum working resistance of the hydraulic support was reduced by 35.86% after roof presplit, and the engineering effect was good. The research results can provide technical guidance and theoretical support for the same type mines.
中文翻译：
顶板预裂工作面通过废弃巷道的减压机理及效果
由于在较厚的煤层中存在废弃的巷道，当工作面经过废弃巷道的受影响区域时，由于顶板的提前破坏，地面压力将大大增加。为了解决这个问题，提出了一种在废弃巷道中预裂屋顶的解决方案。根据华胜虎峰煤矿的开采和地质条件，利用FLAC3D数值软件分析了不同顶板预裂距离的顶板垂直应力和竖向位移。研究结果表明，通过屋面预裂可以有效降低屋面的竖向应力和竖向位移。当屋顶预裂距离为15 m时，最大垂直应力和最大垂直位移均最小。最大垂直应力减小了14。预屋顶后，最大垂直位移降低了55％，最大位移减少了37.51％。通过理论和数值分析相结合，确定了工作面合理的顶板预分断距离约为15 m。工程应用结果表明，顶板预裂后，液压支架的最大工作阻力降低了35.86％，工程效果良好。研究结果可为同类煤矿提供技术指导和理论支持。屋顶预裂后86％，工程效果良好。研究结果可为同类煤矿提供技术指导和理论支持。屋顶预裂后86％，工程效果良好。研究结果可为同类煤矿提供技术指导和理论支持。
更新日期：2020-07-26
中文翻译：
顶板预裂工作面通过废弃巷道的减压机理及效果
由于在较厚的煤层中存在废弃的巷道，当工作面经过废弃巷道的受影响区域时，由于顶板的提前破坏，地面压力将大大增加。为了解决这个问题，提出了一种在废弃巷道中预裂屋顶的解决方案。根据华胜虎峰煤矿的开采和地质条件，利用FLAC3D数值软件分析了不同顶板预裂距离的顶板垂直应力和竖向位移。研究结果表明，通过屋面预裂可以有效降低屋面的竖向应力和竖向位移。当屋顶预裂距离为15 m时，最大垂直应力和最大垂直位移均最小。最大垂直应力减小了14。预屋顶后，最大垂直位移降低了55％，最大位移减少了37.51％。通过理论和数值分析相结合，确定了工作面合理的顶板预分断距离约为15 m。工程应用结果表明，顶板预裂后，液压支架的最大工作阻力降低了35.86％，工程效果良好。研究结果可为同类煤矿提供技术指导和理论支持。屋顶预裂后86％，工程效果良好。研究结果可为同类煤矿提供技术指导和理论支持。屋顶预裂后86％，工程效果良好。研究结果可为同类煤矿提供技术指导和理论支持。
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