首阳煤业15202工作面断层破碎带底板突水危险性评价分析

Evaluation analysis on the risk of water surge at the bottom plate of fracture zone of 15202 working face in Shuyang Coal Industry

为保障首阳煤业15202工作面顺利推进通过F20断层破碎带区域,根据15202工作面的地质条件及F20断层的发育特征,采用FLAC3D数值模拟软件进行工作面推进距断层不同距离时围岩应力及孔隙水压力变化情况的分析,根据分析结果得出工作面在距断层不同距离时底板最大破坏深度及承压水的最大导升高度,进一步通过现场实测与理论分析进行采动影响下断层破碎带的分析。结果表明,数值模拟结果与现场实测和理论分析结果一致,工作面回采推进距F20断层30 m时,煤层即存在着一定的突水危险性,建议对断层破碎带前后30 m区域采取疏水降压和注浆封堵措施。

In order to ensure the smooth advance of 15202 working face of Shuyang Coal Industry through the area of F20 fault fracture zone,according to the geological conditions of 15202 working face and the development characteristics of F20 fault,FLAC3D numerical simulation software was used to analyze the changes of surrounding rock stress and pore water pressure when the working face mining at different distances from the fault.According to the analysis results,the maximum damage depth of the bottom plate and the maximum height of the pressurized water conductive rise were obtained at different distances from the fault,and the analysis of the fault fracture zone under the influence of mining was further carried out by field measurement and theoretical analysis.The results showed that the numerical simulation results were consistent with the results of field measurement and theoretical analysis,and there was a certain risk of water breakout in the coal seam when the working face mined 30 m from the F20 fault,and it was recommended to take hydrophobic pressure reduction and slurry sealing measures in the 30 m area before and after the fault fragmentation zone.