淮南潘谢矿区浅部煤层开采时压架致灾水文地质特征分析

Hydrogeological Characteristic Analysis for Support Breakdown Accidents during Shallow Part Coal Mining in Panji-Xieqiao Mining Area,Huainan

淮南潘谢矿区浅部煤层被新生界厚松散层直接覆盖,开采过程中受到矿山采动压力和高水压共同作用,发生了多个工作面压架事故,经济损失严重。通过对压架工作面水文地质条件的分析和成功回采的类似工作面开采条件比较,认为工作面顶板中老顶中厚层砂岩直接覆盖在煤层之上、老顶以上无承载层,顶板砂岩裂隙发育、富水性强、水压高,防水煤柱尺寸较小等因素是导致工作面出现压架事故的主要因素。并提出了合理布设保护煤柱及工作面参数,做好工作面顶板岩层富水性及地质异常体的探查,加强工作面矿压观测,加快工作面开采速度等防治建议。

The shallow part coal seams in the Panji-Xieqiao mining area, Huainan are directly covered by thick Cenozoic loose beds, because of coactions from mining pressure and high water pressure during production have caused many working face support breakdown accidents and serious economic losses as well. Through comparison after analysis of accident working faces hydrogeological condition and working faces with similar condition but successfully operated, have considered that factors of main roof medium to thick sandstone of accident working faces directly covered coal seams and no bearing strata above the main roof, roof sandstone has developed fissures, strong water yield property, high water pressure, and rather small water barrier dimensions are main causations of support breakdown accident. Thus some controlling suggestions of rational safety pillar layout and working face parameters, perfect prospecting of working face roof water yield property and abnormal geologic bodies, intensifying working face strata control observation, and speeding up working face extraction etc. have been put forward.