采动影响下矿区地下水主要水-岩作用与水化学演化规律

摘要

煤矿开采势必破坏天然水化学环境,然而矿区多类含水层地下水系统水化学研究尚未从时空角度分析采动影响下水化学演化的本质.以临涣矿区为研究示范,基于历年常规水化学数据开展主成分分析,揭示采动影响下水化学演化过程中的水-岩作用机制.其中,第1主成分代表碳酸盐、硫酸盐溶解及黄铁矿氧化作用,第2主成分代表阳离子交替吸附及脱硫酸作用.采动影响下矿区主要突水含水层地下水碳酸盐、硫酸盐溶解及黄铁矿氧化作用均逐渐减弱,减弱区域不尽相同;然而,阳离子交替吸附及脱硫酸作用的变化规律不明显.研究成果为矿井突水水源识别和水资源保护与利用提供理论依据.%Coal mining is bound to destroy the natural hydrochemical environment.However,hydrochemical studies of a groundwater system of multi-aquifer in the mining district rarely focus on the essence of hydrochemical evolution under the mining-induced disturbance in view of space and time.The Linhuan coalmining district is taken as an example to reveal the mechanism of water-rock interactions under the mininginduced disturbance by using the principal component analysis based on conventional ions over the years.The result shows that the first principal component represents the dissolution of carbonate and sulfate and oxidation of pyrite and the second principal component represents the exchange and adsorption of cation and desulphidation.Under the mining-induced disturbance,dissolution of carbonate and sulfate and oxidation of pyrite wear off in the main inrush-water aquifers in the mining district,but the change characteristics of exchange and adsorption of cation and desulphidation are insignificant.The research will provide a theoretical support for the identification of water-inrush source and also for the protection and utilization of groundwater in mining districts.