淮南潘北煤矿A组煤层底板灰岩水数值模拟分析

Coal Seam Group A Floor Limestone Water Numerical Simulation Analysis in Panbei Coalmine,Huainan

潘北矿位于潘集背斜北翼,区内发育了不同尺度断层和裂隙,且切割了不同深度的灰岩含水层。其中,太原组C2Ⅰ组灰岩含水层,直接影响A组煤层安全开采。通过放水试验,获得大量基础试验数据,分析了水文地质条件,建立了水文地质概念模型及数学模型,并采用总恢复和总放水作为模型的识别和验证阶段,结果表明:井田内太原组C2Ⅰ灰岩含水层为非均质性,边界条件是复杂的,含水层内部的断层具有不同程度导、隔水性等;并验证了在局部地段与奥陶系、寒武系灰岩含水层之间存在水力联系,以及灰岩露头区中F1、DF1均为导水断层等,为下一步A组煤层安全开采,防治灰岩水提供科学依据。

The Panbei coalmine is situated at the north limb of the Panji anticline, has developed faults and fissures with different scales in the area and dissected limestone aquifers at different depths. Thereinto, the Taiyuan Formation C2I limestone aquifer directly impact the safe working of coal seam group A. Through dewatering test, large amount basic test data have been obtained. On these grounds, hydrogeological conditions have been analyzed, hydrogeologieal conceptual model and mathematical model established, and used main recovery and main dewatering as the model identification and verification stages. The resuh has demonstrated that： the Taiyuan Formation C2I limestone aquifer in the minefield is anisotropic, boundary condition is complex, and faults within the aquifer have different water transmissibility and resisting property. In local sectors the aquifer has hydraulic connection with Ordovician, Cambrian limestone aquifers and faults F1 and DF1 in limestone outcrop area are all water conducted faults verified. The study can provide scientific basis in forward safe mining of coal seam group A and limestone water control.