An approach for water-inrush risk assessment of deep coal seam mining: a case study in Xinlongzhuang coal mine
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RESEARCH ARTICLE
An approach for water-inrush risk assessment of deep coal seam mining: a case study in Xinlongzhuang coal mine Qixiong Gu 1 & Zhen Huang 1
&
Shijie Li 1 & Wei Zeng 1 & Yun Wu 2 & Kui Zhao 1
Received: 24 April 2020 / Accepted: 20 July 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Most coal mines in China are opting for deep mining due to the rapid reduction of shallow coal reserves, which increases the risk of water-inrush accidents. Given the limitation of water-inrush coefficient method in evaluating the risk of water inrush from the coal seam floor, we analyzed the permeability resistance of the floor under different lithology combinations, and structural conditions of the lower group coal in Yanzhou mining area, based on the in situ pressure permeability test data. Our comprehensive analysis of the influencing factors of water inrush from the coal seam floor reveals key indices for evaluating the water inrush from the coal seam floor and also recommend values for average water-resistance strength of the different lithology, and structure of the lower coal seam floor of Xinglongzhuang coal mine. Besides, we establish a model based on the water-resistance conditions, and two adjacent lower coal working faces minefields of Xinglongzhuang coal mine in Yanzhou are used for the evaluation. Comparative analysis of water-inrush coefficient method and impermeability resistance condition to evaluate the applicability of safety conditions of coal mining under pressure are also performed. Our results show that the impermeability strength is a better measurement for the water-resistance capacity of the floor. These findings may guide the prevention and control of water disasters in coal mining under pressure in the lower formation of the minefield. Keywords Lower coal seam . Mining with pressure . Water-inrush coefficient . Water-resisting strength . Safety factor
Introduction Coal continues to be China’s primary energy source (Ding et al. 2017), with 2017 and 2018, recording coal production of 3.52 billion tons and 3.68 billion tons, respectively. According to China’s national energy development strategic plan (2014–2020), coal accounts for more than 60% of the country’s energy and remains integral in China’s energy strategy (Zhang et al. 2016). However, water-inrush accidents in coal mines are a threat to coal production in China (Bai et al. 2013; Bukowski 2011; Huang et al. 2014a; Ma et al. 2017; Meng et al. 2012; Zhang and Shen 2004). Continuous Responsible Editor: Philippe Garrigues * Zhen Huang [email protected] 1
School of Resources and Environment Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China
2
School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023, China
exploitation of coal resources has seen most mining sites in China gradually transit to deep mines. This increases the risk of water-inrush accidents, which is often dependent on water pressure and mining depth (Meng et al. 2012). Water inrush in a mine
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