Mechanism of mine water inrush from overlying porous aquifer in Quaternary: a case study in Xinhe Coal Mine of Shandong
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ORIGINAL PAPER
Mechanism of mine water inrush from overlying porous aquifer in Quaternary: a case study in Xinhe Coal Mine of Shandong Province, China Huiyong Yin 1
&
Han Zhao 1 & Daolei Xie 1 & Shizhen Sang 1 & Yongli Shi 1 & Maohu Tian 2
Received: 26 June 2018 / Accepted: 1 February 2019 # Saudi Society for Geosciences 2019
Abstract Mine water inrush from coal seam roof is one of the serious disasters that threaten safe production of coal mines. Identification of water inrush source and water inrush pathway is a key task for preventing and controlling such mine water hazards. A water inrush accident at approximately 1316 m3/h occurred at no. 3301 working face of Xinhe Coal Mine in Shandong Province, China. Multiple lines of evidence including characteristics of mine water inflow rate, dynamic monitoring data of water levels in different aquifers, geochemical fingerprinting, and drill hole core examination suggest that the water inrush source originated from the overlying Lower Quaternary porous aquifer with calcite cementation. Structural analysis and numerical simulation with FLAC3D indicate that a low-angle fault, DF49, and mining-induced fractures provided the pathway for the water inrush. Mining activities made the fault hydraulically conductive and connected to the Quaternary aquifer. The numerical simulation demonstrated that the water-conducting fracture zone in the coal seam roof extended to the fault. Groundwater gushed into the mining area from the Quaternary aquifer via the combined pathway of the activated fault and mining-induced fractures. Presence of the fault in the overlying formations played a critical role in occurrence of the water inrush. Results from this case study can be of reference to all coal mines with faults or other geological discontinuities present in the overlying formation. These discontinuities may significantly extend the height of the mining-induced water-conducting fracture zone in the roof and thus increase water inrush risks. Keywords Fault activation . Numeric simulation . Water inrush . Water inrush source . Water inrush pathway
Introduction
Editorial handling: Broder J. Merkel Electronic supplementary material The online version of this article (https://doi.org/10.1007/s12517-019-4325-0) contains supplementary material, which is available to authorized users. * Huiyong Yin [email protected] * Daolei Xie [email protected] 1
Shandong Provincial Key Laboratory of Depositional Mineralization & Sedimentary Minerals, College of Earth Science & Engineering, Shandong University of Science and Technology, Qingdao 266590, China
2
Shandong Xinhe Mining Co., Ltd., Jining 272400, China
China’s coal production is ranked first in the world, but it is also one of the countries with the worst safety records (Guo 2016). As one of the safety concerns, mine water inrush affects the safety of mine production and people’s property seriously (Wei et al. 2015; Sun et al. 2016; Wei et al. 2017; Yang et al. 2017; Wu et al. 2017a; Yin et al. 2018a). The water inrush may occur f
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