Abstract: 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.
Keywords: Bayesian discriminant analysis; inverse hydrogeochemical simulation; hydraulic connection; water-rock interaction; Yangliu coal mine
合肥工业大学学报自科版