Abstract
Since the precise identification and prediction and early warning of compound coal-rock dynamic disaster remain difficult, a new coal characterisation and prediction method for compound coal-rock dynamic disasters was described based on theoretical analysis, laboratory experiment, field sampling, mathematical treatment, and industrial testing. The results implied that the physicomechanical properties of coal in a compound coal-rock dynamic disaster are between those pertinent to a typical rock burst and a coal-gas outburst, i.e., with high crustal stress surrounding pressure, high gas pressure, low permeability, bump proneness, and outburst risk. The predicted drilling data indicate moderate gas desorption indices. The gas desorption velocity and permeability of compound coal-rock dynamic disaster coal decrease with the increase in crustal stress, while increase and decrease with the increase in gas pressure, respectively, at the same time, and they change little with increasing temperature. Gas extraction leads to the increase in coal mass brittleness and bump proneness. Based on the unique physical-mechanical properties of compound coal-rock dynamic disaster coal, a reasonably sensitive predictive index and critical value for Donglin Coal Mine were determined.
Highlights
Due to the prevailing demand for energy resources, the coalbased energy pattern of China will not change in the foreseeable future
Some of China’s coal mines such as those in the Pingdingshan mining areas, Huainan mining areas, Xinji mining areas, Fengcheng mining areas, Fuxin mining areas, and Fushun mining areas took the lead in deep mining, where some compound coal-rock dynamic disasters already occurred or are likely to occur
According to the above analysis, when the adsorption pressure and confining pressure are constant, with the increase in temperature, the coal permeability rises slightly, but the variation is smooth (Figures 13 and 14); under high confining pressure, the increase in permeability as the temperature rises is relatively small; when the gas adsorption pressure is 4 MPa, the seepage flow velocity and permeability exceed the measuring range of equipment and cannot be accurately measured
Summary
Due to the prevailing demand for energy resources, the coalbased energy pattern of China will not change in the foreseeable future. Many scholars have studied the mechanism of compound coal-rock dynamic disasters, their prediction, early warning, and prevention: Petukhov [1], Zhang et al [2], He et al [3], Li et al [4, 5], Li [6], Zhang et al [7], Pan [8], Yin et al [9], Dou et al [10], and Dong et al [11]. Zhang [18], Yuan [15], Jianwei [19], Jiang et al [20], Dong et al [11], Sheng et al [21], and Ouyang et al [22] have studied the prediction, early warning, and evaluation of compound coal-rock dynamic disasters. The coal physical-mechanical characterisation and prediction method of a compound coal-rock dynamic disaster still contain many deficiencies; in this study, a new coal characterisation and prediction method of compound coal-rock dynamic disasters were studied, based on the actual occurrence data of compound coal-rock dynamic disasters
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