Experimental simulation of water-inrush disaster from the floor of mine and its mechanism investigation
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ORIGINAL PAPER
Experimental simulation of water-inrush disaster from the floor of mine and its mechanism investigation Shichuan Zhang 1 & Weijia Guo 1 & Yangyag Li 1
Received: 7 June 2017 / Accepted: 3 November 2017 / Published online: 22 November 2017 # Saudi Society for Geosciences 2017
Abstract Mine water inrush is very common in China and can cause hysteretic and severe damages to the safety production of coal mines. Essentially, water inrush from coal floor can be attributed to the connection of cracks and the formation of water channel in floor rocks under the interaction of stress field and seepage field. In this paper, the interaction between cracks, stress field, and seepage field in floor rocks was studied by physical simulation; the evolution law of water inrush from floor cracks was obtained under the fluid-solid coupling effect, and the monitoring of rock stress and seepage pressure was realized by virtue of soil pressure and pore-pressure sensors. The results indicated that the permeability of floor rocks had regional and temporal characteristics due to the cyclical variation of in-situ floor stress. The high-permeability zone occurred under the early mining stress area, and gradually extended and connected inside the floor. As a result, more confined water could flood into the connected cracks and thus changed the seepage field in front of working face. This work provides new approaches and knowledge for researching coal floor water inrush and has important significances for the prevention of coal water disasters.
Keywords Coal mining . Similarity test . Complete floor . Confined water . Visualization
* Shichuan Zhang [email protected] * Weijia Guo [email protected]
1
State Key Laboratory of Mining Disaster Prevention and Control, Shandong University of Science and Technology, Qingdao, Shandong 266590, China
Introduction Mine water disasters, as one kind of major disasters in coal mining, have been threatening the safety production of coal mines since the advent of mining industry in China. According to stati`stics (Wu et al. 2013), 60% of mine accidents are related to groundwater. Especially in recent years, with the increase of mining depth, the influence of highpressure water on coal seam floors becomes more and more obvious, and the occurrence possibility of water disasters becomes higher accordingly. The world’s major mining countries, such as America, Australia, etc., have less research on the floor water inrush (Hu et al. 2008), because their hydrogeological conditions of coal mines are far less complicated than those of China. Besides, developed countries generally formulate very stringent requirements on environmental protection, and the mines would be shut down if there is water pollution caused by mining activities. In China, scholars and engineers have extensively studied the mechanism and prediction of water inrush from coal floor, and their achievements play an important role in the prevention of coal floor water inrush. The typical proposed theories include the water-inrush coef
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