华北隐伏型煤矿地下水水化学演化多元统计分析

为了阐明采动影响下华北隐伏型煤矿地下水化学演化规律，选取淮北煤田任楼煤矿为研究示范，运用系统聚类与主成分分析法对任楼煤矿不同时期的四含、煤系、太灰与奥灰含水层地下水水样的常规水化学指标（K++Na+、Mg2+、Ca2+、Cl-、SO₄2-、HCO₃-与CO₃2-）开展多元统计分析，从而划分不同水化学类型，进而揭示地下水化学形成条件。研究结果表明:地下水"脱硫酸"程度揭示系统逐渐封闭，受采动影响逐渐减弱；"硬化"程度揭示系统逐渐开放，受采动影响逐渐增强；"咸化"作用贯穿于"脱硫酸"与"硬化"作用过程中。而且，地下水因受采动与"咸化"作用影响，"脱硫酸"与"硬化"作用程度表现几乎相反的变化趋势。 

Multivariate statistical analysis on hydrochemical evolution of groundwater in the concealed coal mines in North China

In order to illustrate the hydrochemical evolution law of groundwater in the concealed coal mines in North China, taking the Renlou mine in Huaibei coal field for example, hierarchical cluster analysis and principal component analysis are used to analyze the conventional hydrochemical data (K++Na+, Mg2+, Ca2+, Cl-, SO₄2-, HCO₃- and CO₃2-) of the fourth aquifer of the Quaternary, the coal measures, Taiyuan Formation limestone and Ordovician limestone. Based on these analysis, different hydrochemical types are partitioned and hydrochemical formation conditions are clarified accordingly. Research results show that "desulfurizing" suggests increasing closeness in the groundwater system and decreasing mining disturbance while "hardening" suggests decreasing closeness in the groundwater system and increasing mining disturbance, and "salinizing" lies in "desulfurizing" and "hardening" process. Because of mining disturbance and "salinizing", "desulfurizing" and "hardening" show almost opposite trends in the groundwater system.