贝叶斯突水水源判别与反向水文地球化学模拟的含水层水力分析

为探究杨柳煤矿主要突水含水层之间的水力联系,文章根据杨柳煤矿松散层第4含水层(简称“四含”或“I”含水层)、二叠系煤系砂岩裂隙含水层(简称“煤系”或“Ⅱ”含水层)和石炭系太原组灰岩岩溶裂隙含水层(简称“太灰”或“Ⅲ”含水层)的地下水化学数据建立贝叶斯突水水源判别模型,并结合地质与构造条件,对3个突水含水层之间的补给关系、径流路径以及径流路径中的水-岩作用进行研究。结果表明:杨柳煤矿大部分区域不同含水层之间的水力联系较弱,在矿井西北部四含与煤系、煤系与太灰之间存在一定程度的水力联系;四含水通过西风井附近煤系砂岩露头向煤系补给,煤系水通过DF25、DF10断层向太灰补给,太灰水通过GF383断层向煤系补给。误判水样的反向水文地球化学模拟结果定量验证了离子比例分析揭示的径流路径中的水-岩作用,进一步证明了含水层之间的补给关系。该研究成果为快速判断矿区不同含水层之间的补给关系提供了技术参考。

In order to identify the hydraulic connection between the main water-inrush aquifers in Yangliu coal mine, a Bayesian discriminant model of water inrush source was established based on the hydrochemical data of Quaternary loose aquifer (Quaternary aquifer or aquifer I), Permian coal measure sandstone fissure aquifer (Permian sandstone aquifer or aquifer II) and Carboniferous Taiyuan Formation limestone fissure aquifer (Carboniferous limestone aquifer or aquifer III). Meanwhile, combined with the condition of geologic structure, the supply relationship, the flow path and the water-rock interaction in the flow path of the three water-inrush aquifers were studied. Results show that the hydraulic connections between the main water-inrush aquifers in Yangliu coal mine are weak. There were hydraulic connections between Quaternary aquifer and Permian sandstone aquifer, Permian sandstone aquifer and Carboniferous limestone aquifer in the northwest of study area. The Quaternary water recharged to Permian sandstone aquifer through exposed sandstone near the Xifeng well. The Permian water recharged to Carboniferous limestone aquifer through the DF25 and DF10 faults, and the Carboniferous water recharged to Permian sandstone aquifer through GF383 fault. The inverse hydrogeochemical simulation for the misjudged groundwater samples verifies the water-rock interaction in the flow path revealed by the ion ratio analysis, and proves the supply relationship between the water-inrush aquifers. The research results can provide a technical reference to rapidly identify the supply relationship between different ent aquifers in the mining area.