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Zoucheng, China

Wang L.,China University of Mining and Technology | Wang L.,Post Doctoral Research Station of Huaibei Mining Corporation Ltd | Cheng Y.-P.,China University of Mining and Technology | Zhai Q.-W.,Yanzhou Coal Industry Co. | And 3 more authors.
Meitan Xuebao/Journal of the China Coal Society | Year: 2013

Dynamic disasters, such as rock bursts, water inrush, gas outbursts and surface subsidence, are easily induced under the specific geological conditions with a thick-hard igneous rock overlying main coal seams in Haizi Coal Mine. To understand the factors affecting dynamic disasters, the authors analyzed the outburst coal seams' physical parameters using scanning electron microscope, component and reflectivity measurement method, studied the separation fractures evolution law of overlying rocks with plate stress arch balance theory, and investigated the factors of rock bursts and water inrush with beam structure broken elasticity theory. The results show that the thermal evolution and trap effect of igneous rock result in the coal seam porosity well developed, the gas adsorption ability enhanced and the outburst risk increased. The igneous rock, called a "main key stratum", will not subside nor break for a long time, causing the fractures and bed separations under the stratum not to close, which is good for pressure relief gas drainage. On the other hand, the thick-hard igneous rock will suddenly break down with continuously mining operation, which releases and spreads the elastic energy, easily causing complex dynamic disasters, namely rock bursts, mine floods, gas outburst and surface subsidence in coal mines. Source


Zhang R.,China University of Mining and Technology | Jiang Z.-Q.,China University of Mining and Technology | Yue Z.-C.,Yanzhou Coal Industry Co. | Zhao L.-T.,Yanzhou Coal Industry Co. | Yu X.-L.,Yanzhou Coal Industry Co.
Caikuang yu Anquan Gongcheng Xuebao/Journal of Mining and Safety Engineering | Year: 2012

Based on the condition of fully-mechanized working face in one mine, by using the field strain measurement and numerical simulation as a mutual authentication method, a comprehensive comparative study of the thick seam floor's failure depth under the mining was carried out in this paper. Field measurement studies show that the failure depth of the coal seam floor is about 13~16 m. The influence of the mining pressure on the floor presents the feature of"advance"appearance and "lag" continuity, while the advance and lag distances are manifested as the feature of decreaing gradually from shallow to deep. The numerical simulations indicate that floor failure zone affected by mining is between 0~16 m under the coal seam, which means the greatest failure depth of floor is 16 m, the zone of 16~36 m under the coal seam is slightly affected by coal mining, and the mining pressure tends to in situ pressure along with the increase of depth. By the comprehensive analysis, the failure depth of coal seam floor is 16 m, and the research results can make reference for safety mining of coal resources and mine water disaster control under the similar conditions. Source


Zhang R.,China University of Mining and Technology | Jiang Z.-Q.,China University of Mining and Technology | Yu Z.-R.,China University of Mining and Technology | Cao D.-T.,Yanzhou Coal Industry Co. | Wang Z.-S.,Yanzhou Coal Industry Co.
Caikuang yu Anquan Gongcheng Xuebao/Journal of Mining and Safety Engineering | Year: 2013

Based on the condition of the fully-mechanized working face in the mine, the rock deformations that changes with workface advance under different depth of coal seam floor are measured through the strain method. The results show that the violent influent range of mine pressure on the coal seam floor was "advance" appearance and "lag" continuity. The distance of the "advance" appearance was 37 m and the "lag" continuity was 32 m, and the violent influent range of mine pressure on the coal seam floor corresponding is decreasing from the shallow to deep. Combining with the analysis of the drilling sighting glass on mining floor, it is confirmed that the damage depth of working face floor mining-induced was 12 m. Based on the field in-situ measurement, using FLAC3D numerical simulation as a method of making a comprehensive comparative study about the failure characteristics of the coal floor, it reveals the three-dimensional failure characteristics of the floor in the mining process better. Using the field strain measurement, in-situ drilling sighting glass observations and numerical simulations as a mutual authentication method of making a comprehensive comparative study of the failure characteristics of the coal floor, it makes up the disadvantage of single research means in the past. Source

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