Discrimination of mine water-inflow sources based on the multivariate mixed model and fuzzy comprehensive evaluation
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ORIGINAL PAPER
Discrimination of mine water-inflow sources based on the multivariate mixed model and fuzzy comprehensive evaluation Jiuchuan Wei 1 & Guanghui Li 1 & Daolei Xie 1
&
Gongyishan Yu 1 & Xiaoquan Man 1 & Jie Wang 2
Received: 21 May 2020 / Accepted: 20 August 2020 # Saudi Society for Geosciences 2020
Abstract The accurate discrimination of the mine water-inflow sources is one of the main focuses of mine hydrogeological work and represents the basis of coal mine water hazard prevention. To accurately discriminate the water-inflow source in the – 700-m air return tunnel of the Longgu Coal Mine, firstly, according to the water-inflow conditions of the coal mine, three water sources were preliminarily estimated: the Ordovician limestone aquifer, the No. 3 limestone aquifer, and the sandstone aquifer in the roof and floor of No. 3 coal seam. A number of water samples were then selected from each of the three aquifers as the standard comparison water samples. A sample of water inflow from the tunnel of the coal mine and nearby locations was selected as the water sample to be tested. Six conventional hydrochemical indexes (Na+ + K+, Ca2+, Mg2+, Cl−, SO42−, and HCO3−) in the water sample to be tested and standard water sample were tested and discriminated by the multivariate mixed model and fuzzy comprehensive evaluation. The results show that the water-inflow source in the –n700-m air return tunnel is the Ordovician limestone aquifer, and a hydraulic connection was observed between the No. 3 limestone aquifer and the Ordovician limestone aquifer. The findings provide data support for the management of the water-inflow process in the Longgu Coal Mine, and have practical guiding significance for the discriminating water sources in other coal mines affected by water hazards. Keywords Juye coalfield . Source discrimination of water inflow . Multivariate mixed model . Fuzzy comprehensive evaluation
Introduction China’s coal production ranks first in the world, although the continuous mining in recent decades has led most domestic mines to enter the deep mining stage. Moreover, due to the many types of geological conditions and complex structures in coal fields in China, the factors and mechanisms associated with hidden disasters caused by mine water inflow are variable (Han et al. 2020b, Sun et al. 2016b). The threat of such disasters in China is among the highest worldwide, and the Responsible Editor: Broder J. Merkel * Daolei Xie [email protected] 1
College of Earth Sciences and Engineering, Shandong University of Science and Technology, Qingdao 266590, People’s Republic of China
2
Shandong Energy Xinwen Mining Group Co., Ltd., Xintai 270982, China
prevention and control of mine water inflow is facing unprecedented challenges. Mine water hazards are one of the major disasters that affect the safety of mine production, and they not only affect the normal production of the mine but also may inundate the mining area or mine, which can cause serious casualties and property losses (Shi et al. 2019; Qiu et
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