A case study of water inrush incident through fault zone in China and the corresponding treatment measures
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ORIGINAL PAPER
A case study of water inrush incident through fault zone in China and the corresponding treatment measures Ziwei Qian 1 & Zhen Huang 2 & Jianguo Song 3 Received: 7 December 2017 / Accepted: 11 July 2018 # Saudi Society for Geosciences 2018
Abstract In 2010, a water inrush accident through a fault with a high flow rate occurred at Tianzhuang coal mine in Jining, Shandong Province, China, which was subject to the fault excavation. Grouting is an important treatment method before and after water inrush accidents. In this paper, the evolution of this water inrush accident is studied, and the effective treatment method is presented. The obtained results indicate that groundwater from Ordovician limestone aquifer 28.5 m below the floor flowed into the roadway through the fault zone. Results also show that this water inrush through the fault zone can be divided into a flow rate steady increase phase, a rapidly increase phase, a decrease phase, and a steady phase. The first two phases resulted from permeability increase of the fault, which was caused by seepage failure, and water level of the aquifer led to last two phases. Additionally, grouting using the ground borehole successfully controlled this water inrush accident, and it is proven to be a valid method. Keywords Fault zone . Roadway . Water inrush channel . Ordovician limestone . Grouting
Introduction Water inrush caused by the complex geological conditions, after gas explosion, is the most serious disaster in mining work accidents in China (Sui et al. 2011; Wu et al. 2011). Although since 2005 with increasing application of groundwater inrush prevention systems, the
Highlights • An underground water inrush accident at Tianzhuang coal mine was studied. • We observed flow data during the water inrush accident. • Flow evolution course during water inrush accident was proposed. • This water inrush accident was successfully controlled by the proposed treatments. * Ziwei Qian [email protected] 1
State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou, China
2
School of Resources and Environment Engineering, Jiangxi University of Science and Technology, Ganzhou, China
3
Shandong Energy Linyi Mining Group Co., Ltd, Linyi, China
number of related coal mine accidents has shown a clear descending trend (Huang et al. 2014; Ma et al. 2017). Water inrush accidents still occur in China coal mines every year and result in the death of miners (Ma et al. 2017), e.g., on March 2010, a water inrush incident occurred at Luotuoshan coal mine, 32 miners died, and on September 2015, a water inrush accident in Jiangjiawang coal mine killed 21 miners, and 11 miners died at Zhaojin coal mine in 2016. Thus, on no account can we ignore the immense danger of mine water accident (Huang et al. 2014). According to the statistics (Qiao et al. 2013; Huang et al. 2014), more than 80% of the water inrush accidents in China were related with the faults around the working face or the roadway. Numerous researc
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