Recognition model of groundwater inrush source of coal mine: a case study on Jiaozuo coal mine in China
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ORIGINAL PAPER
Recognition model of groundwater inrush source of coal mine: a case study on Jiaozuo coal mine in China Huang Ping-hua 1 & Wang Xin-yi 1 & Han Su-min 2
Received: 15 November 2016 / Accepted: 5 July 2017 # Saudi Society for Geosciences 2017
Abstract The mine water source discrimination plays an important role in guiding mine water prevention in the water prevention work. Improving especially the discrimination accuracy of mine water sources which will cause water inrush is the important foundation of avoiding such accident and thus ensuring personnel and property being in safety. Based on Fisher discriminant analysis theory (FDA) and gray correlation analysis theory (GCA), groundwater chemical components (Ca2+, Mg2+, K++Na+, Cl−, SO42−, and HCO3−) data at main water inrush aquifers in a typical coal mine through experiments, FDA-GCA recognition model of water inrush sources was established and then verified. Results indicated that the FDA-GCA recognition model of water inrush sources was characterized by high discrimination precision, and false determination rate obtained by back-substitution estimation method was zero. Thus, it had strong discrimination ability of water inrush sources. The significance ranking of input variables in the water source FDA-GCA recognition model was Ca2+ > Mg2+ > HCO3− > SO42− > K+ + Na+ > Cl−. The data in this paper were discriminated by the distance discriminant method and BP neural network discriminant analysis method, the correct rate of which is 90%, 80%, slightly lower than or equal to the accuracy of 90% by the FDA-GCA recognition model.
* Huang Ping-hua [email protected]
1
School of Resources and Environment, Henan Polytechnic University, Jiaozuo 454000, China
2
School of Electrical Engineering and Automation, Henan Polytechnic University, Jiaozuo 454000, China
Keywords Water inrush source . FDA-GCA recognition model . Coal mine area . Variable significance . Water chemistry
Introduction How to judge the cause of mine water inrush in time and accurately find water inrush source is the key to prevent water inrush. Recognition of water inrush sources of a mine is usually implemented through a comparative analysis of conventional ion contents in groundwater because these contents differ significantly. The hydrogeochemical causes and sources are also different. In coal field exploitation in North China, malignant mine water inrush disasters are mainly due to the presence of limestone karst water on the coal seam floor (Wang et al. 2011). However, analyzing the conventional ion features of groundwater can only make qualitative judgment on the sources of groundwater (Wu et al. 2015). In practical engineering, defining the characteristic water quality threshold values of various water sources is necessary to accurately judge water inrush sources. Therefore, scholars have established recognition models of water inrush sources according to hydrochemical components in groundwater at various aquifers and by combining mathematical classification theories, such as f
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