陕西煤炭

奥陶系水严重影响司马煤矿下组煤安全开采。为保证下组煤的安全开采，通过地质特征研究和数值模拟试验，探讨了石炭系上统太原组中的岩性组合特征对煤层开采的影响以及奥陶系顶部碳酸岩作为相对隔水层的可行性，模拟了3号和15号煤层在不同采动条件下奥陶系岩溶水的导升高度。结果表明，3号煤层开采对奥陶系岩溶水影响有限，底板完整的隔水层有效阻止了突水的发生；然而，在开采15号煤层时，由于底板与奥陶系顶板间距较小，岩溶水在矿压与水压的共同作用下，存在底板突水灾害的风险。另外可以充分利用奥陶系顶部碳酸盐岩相对隔水层的作用，但需要对有缺陷的隔水层进行修复。本研究可为未来司马煤矿下组煤安全开采提供技术参考。

The Ordovician water system has a serious impact on the safe mining of coal in Sima coal mine.In order to ensure the safe mining of the lower layer of coal, this paper through geological characteristics study and numerical simulation test, explores the influence of lithologic combination in Taiyuan Formation of Carboniferous System on coal mining.The feasibility of carbonatite on the top of Ordovician system as relative aquifuge is discussed, and the water-conducting height of Ordovician karst water in the 3# and 15# coal seams under different mining conditions is simulated.The results show that the mining of No.3 coal seam has limited influence on the Ordovician karst water, and the integrity aquifuge on the floor effectively prevents water inrush.However, during the mining of the 15# coal seam, because of the small spacing between the floor and the roof of the Ordovician system, the risk of a water inrush of the floor was posed by the combination of karst water and mine pressure.The effect of relative aquifuge can be fully utilized, but the defective aquifuge needs to be repaired.This study provides technical references for the safe mining of coal in Sima Coal Mine in the future.