帷幕墙影响下侏罗系砾岩含水层地下水化学时空演化规律  

Spatiotemporal evolutionary patterns of the hydrochemistry of Jurassic conglomerate aquifers under the influence of curtain walls

作　　者：陈陆望[1] 武明辉 侯晓伟 胡永胜 张苗 蔡欣悦 殷晓曦[1] 施小平[1] CHEN Luwang;WU Minghui;HOU Xiaowei;HU Yongsheng;ZHANG Miao;CAI Xinyue;YIN Xiaoxi;SHI Xiaoping(School of Resources and Environmental Engineering,Hefei University of Technology,Hefei 230009,China)

机构地区：[1]合肥工业大学资源与环境工程学院,安徽合肥230009

出　　处：《煤田地质与勘探》2025年第1期174-183,共10页Coal Geology & Exploration

基　　金：国家自然科学基金面上项目(41972256)。

摘　　要：【目的】帷幕墙是煤矿水害防治的主要工程之一,不仅改变地下水动力场,帷幕墙溶蚀也会影响地下水化学场,导致水化学组分发生变化。【方法】以安徽淮北煤田朱仙庄煤矿侏罗系砾岩含水层为研究对象,基于常规水化学组分统计、Piper三线图、离子组合比例及主成分分析,探讨帷幕墙对该含水层水化学作用的影响,阐明帷幕墙影响下水化学作用时空演化规律。【结果和讨论】结果表明:(1)帷幕墙内外水化学特征差异显著,与帷幕墙外相比,帷幕墙内地下水中Ca2+和Mg2+含量增加;(2)修建帷幕墙后,水化学作用主要为基于方解石(CaCO3)与白云石(CaMg(CO3)2)溶滤溶解的帷幕墙溶蚀作用,并伴随不同程度的黄铁矿氧化、阳离子交替吸附以及脱硫酸作用;(3)受采动影响,帷幕墙内地下水受帷幕墙溶蚀作用影响趋于增强,且与东线帷幕墙相比,北线帷幕墙溶蚀作用相对较弱。研究成果可为帷幕墙监测防护和地下水环境保护提供理论支持。[Objective]Curtain walls,recognized as a primary project for the prevention and control of water disasters in coal mines,will change the dynamic field of groundwater.Furthermore,their dissolution will affect the chemical field of groundwater,leading to variations in its hydrochemical composition.[Methods]This study investigated the Jurassic conglomerate aquifers in the Zhuxianzhuang Coal Mine,Huaibei coal field.Based on the statistics of conventional hydrochemical composition,Piper diagrams,ion combination proportions,and principal component analysis(PCA),this study explored the impacts of curtain walls on the hydrochemistry of the aquifers and determined the spatiotemporal hydrochemical evolutionary patterns under the influence of the curtain walls.[Results and Conclusions]The results indicate that the hydrochemical characteristics differ greatly between inside and outside the curtain walls,with the groundwater inside the curtain walls exhibiting elevated Ca2+and Mg2+concentrations compared to that outside the curtain walls.After the construction of the curtain walls,the hydrochemical processes are dominated by the dissolution of the curtain walls based on the leaching and dissolution of calcite(CaCO3)and dolomite(CaMg(CO3)2),accompanied by varying degrees of pyrite oxidation,alternating adsorption of cations,and desulfurization.Influenced by mining,the dissolution of the curtain walls produces significantly enhanced impacts on groundwater within them,with the dissolution of the northern curtain wall relatively weaker than that of the eastern counterpart.The results of this study will provide theoretical support for the monitoring and protection of curtain walls and the environmental protection of groundwater.

关 键 词：侏罗系砾岩含水层 帷幕墙 溶蚀 水化学演化 朱仙庄煤矿 

分 类 号：TD741[矿业工程—矿井通风与安全]