Early warning information evolution characteristics of water inrush from floor in underground coal mining
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ORIGINAL PAPER
Early warning information evolution characteristics of water inrush from floor in underground coal mining Shiliang Liu 1 & Weitao Liu 2 & Zhichao Huo 3 & Wencheng Song 4 Received: 6 March 2018 / Accepted: 17 December 2018 # Saudi Society for Geosciences 2019
Abstract Early warning information evolution characteristics are of great significance to the risk reduction of water inrush from floor in underground coal mining. In this paper, stress, pore water pressure, and water inrush position are used as the early warning information indicators. A physical simulation experiment of water inrush from mining floor was carried out, which revealed evolution characteristics of the stress, pore water pressure in the whole process of the floor water inrush from birth, development to the catastrophe. Also, the position of water inrush in the experiment was observed and verified by the thin-plate theory. The experiment shows that the fluctuation of the pore water pressure after a sharp rise and the continuous increase of the vertical stress can be regarded as the early warning information of floor water inrush. The position of water inrush is located at the intersection point between the center of the inclined direction of working face and the distance from open-off cut 18 cm, which is in agreement with the result of the experiment. The research results are of great significance to the short-term risk prediction and the safe mining above the confined water. Keywords Floor water inrush . Early warning information . Position of water inrush . Physical simulation experiment . Thin-plate theory
Introduction In recent years, the situation of coal mine safety production has been generally improved in China, but the total number of accidents is still large, as shown in Fig. 1. In China’s major * Weitao Liu [email protected] Shiliang Liu [email protected] Zhichao Huo [email protected] Wencheng Song [email protected] 1
School of Resources and Geosciences, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China
2
School of Mining and Safety Engineering, Shandong University of Science and Technology, Qingdao 266590, Shandong, China
3
Shandong Ding’an Testing Co., Ltd., Jinan 250032, Shandong, China
4
School of Civil Engineering, Dalian University of Technology, Dalian 116024, Liaoning, China
coal mine accident, the water inrush accident is second only to the gas accident in the number of casualties and the number of occurrences, which causes huge direct economic losses to the country (Liu et al. 2018). Water inrush accidents and casualties were counted from 2000 to 2017, as shown in Fig. 1. Floor water inrush disaster is one of the main water inrush accidents in underground coal mines in China. In recent years, the lower group coal seam is gradually exploited after the end of the upper group coal mining in the eastern mining area of China, which is characterized with small interval between the lower group coal seam and the bottom limestone confined aquifer. Hence, with the increasing of coal
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