孟加拉国巴拉普库利亚煤矿含水层水力联系研究

为进一步查明孟加拉国巴拉普库利亚煤矿水文地质特征及含水层间水力联系，为矿井水害防治提供理论依据，以19组水质化验数据为基础，结合含水层及隔水层空间展布特征、井田构造特征、水位历时曲线、水化学类型、氢氧同位素特征等，综合分析新近系UDT含水层、Ⅵ煤顶板含水层、Ⅵ煤含水层之间的水力联系。结果表明，井田北部LDT隔水层局部缺失，为UDT含水层水向含煤地层补给提供了条件；井田北翼煤层顶板含水层与UDT含水层水位变化规律密切相关，且水位相近，初步证明两者存在水力联系；各含水层水均为HCO₃-Ca·Na·Mg型，均为低矿化度水，进一步证明各含水层间存在水力循环；聚类分析结果表明各含水层水质存在一定关联度，推演含水层间水力联系程度；氢(δD)氧(δ18O)同位素特征点分布于全球大气降水线附近，表明大气降水是各含水层共同的补给水源。研究成果可以指导孟加拉国巴拉普库利亚煤矿Ⅵ煤层开采时水害防治方向。 

Hydraulic connection of aquifers in Barapukuria Coal Mine,Bangladesh

In order to further identify the hydrogeological characteristics and hydraulic connection between aquifers of Barapukuria Coal Mine in Bangladesh, and provide a theoretical basis for the prevention and control of mine water disasters, this paper analyzes the hydraulic connection between Neogene UDT aquifer, Ⅵ coal roof aquifer and Ⅵ coal aquifer based on 19 sets of water quality test data, combined with the spatial distribution characteristics of aquifers, field structure characteristics, water level duration curve, hydrochemical type and hydrogen and oxygen isotope characteristics. The results show that the LDT aquifer in the northern part of the well field is partially missing, which provides conditions for the water supply of the UDT aquifer to the coal measure strata. The roof aquifer of coal seam in the north wing of the mine field is closely related to the water level change law of UDT aquifer, and the water level elevation is similar, which preliminarily proves that there is a hydraulic connection between the two. The water of each aquifer is HCO₃-Ca·Na·Mg type, which is low salinity water, further proving that there is a hydraulic cycle between each aquifer. Cluster analysis results show that water quality of each aquifer has a certain degree of correlation, and the degree of hydraulic connection between aquifers is deduced. Hydrogen(δD)oxygen(δ18O) isotopic characteristics are distributed near the global atmospheric precipitation line, indicating that atmospheric precipitation is the common recharge source of aquifers. The research results can guide the prevention and control of water disaster in Ⅵ coal seam mining of Balapukuliya Coal Mine in Bangladesh.