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Discrimination of water-inrush source and evolution analysis of hydrochemical environment under mining in Renlou coal mine, Anhui Province, China

Authors
  • Zhang, Jie1
  • Chen, Luwang1
  • Chen, Yifei1
  • Ge, Rutao1
  • Ma, Lei1
  • Zhou, Kandong1
  • Shi, Xiaoping1
  • 1 Hefei University of Technology, Hefei, 230009, China , Hefei (China)
Type
Published Article
Journal
Environmental Earth Sciences
Publisher
Springer-Verlag
Publication Date
Jan 08, 2020
Volume
79
Issue
2
Identifiers
DOI: 10.1007/s12665-019-8803-1
Source
Springer Nature
Keywords
License
Yellow

Abstract

With the development of mining, the hydrochemical environment has changed in the Renlou coal mine, Anhui Province, China. It will be of great significance to coal mine safety production by exploring the temporal and spatial evolution law of hydrochemistry of main water-inrush aquifers in Renlou coal mine under the effect of mining. Groundwater samples from three main water-inrush aquifers in different periods were collected to analyze their principal components and establish the discrimination model of water-inrush source. The first and second principal components with eigenvalues greater than 1 were selected, in which the first principal component represents sulfate dissolution and pyrite oxidation, and the second principal component represents desulfurization and cation alternating adsorption. The evolution law of hydrochemical environment was analyzed by combining the distribution characteristics of principal component scores with the spatial location of misjudged groundwater samples. The results show that (1) Quaternary aquifer is greatly affected by mining, and the hydraulic connections with Carboniferous limestone aquifer in the central region leads to two misjudged groundwater samples in the discriminant model. (2) Permian sandstone aquifer is to a certain extent affected by mining, which shows a relatively closed hydrogeological environment in most areas of coal mine and an opened environment in some areas with time. There are five misjudged samples in the discriminant model due to hydraulic connections with the Quaternary aquifer and carboniferous aquifer in some areas. (3) Carboniferous limestone aquifer is controlled by typical faults and collapse columns, and mining has a slight influence on it. In the central area, there are hydraulic connections with the Quaternary aquifer and the Permian sandstone aquifer due to the collapse columns, which lead to four misjudged groundwater samples in the discriminant model.

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