(1. School of Resource and Safety Engineering，Central South University，Changsha，Hunan 410083，China；2. College of Civil Engineering and Mechanics，Xiangtan University，Xiangtan，Hunan 411105，China；3. Hunan Key Laboratory of Geomechanics and Engineering Safety，Xiangtan University，Xiangtan，Hunan 411105，China)
Abstract：Coal and gas outburst is a very complex dynamic disaster in underground coal mining process. In this paper，a numerical model was established based on the theory of particle flow to simulate the development of micro-cracks，displacement，force and velocity fields，and to investigate the microscopic mechanism of gas pressure and layer-stiffness ratio. The simulation results show that the coal and gas outburst is a relatively quick process. The shear cracks were mainly concentrated in the front tip of outburst，the tensile cracks occurred deep inside the coal. The gas outburst has great influence on the coal and rock damage. When the gas pressure is relatively small，the shear cracks occur at the front and the tensile crack reached deeper. When the gas pressure is relatively large，the shear cracks and tensile cracks penetrate into the same depth. The damage of coal and rock and the shear crack ratio increases. When the layer-stiffness ratios is not the same，the speed and shape of crack propagation are not the same.
黄维新1，刘敦文1，夏 明2，3. 煤与瓦斯突出过程的细观机制研究[J]. 岩石力学与工程学报, 2017, 36(2): 429-436.
HUANG Weixin1，LIU Dunwen1，XIA Ming2，3. Study of meso-mechanism of coal and gas outburst. , 2017, 36(2): 429-436.
王路军，李守国，高 坤，等. 关于煤与瓦斯突出的数值模拟[J]. 煤矿安全，2008，4(7)：4-6.(WANG Lujun，LI Shouguo，GAO Kun，et al. Numerical simulation on coal and gas outburst[J]. Safety in Coal Mines，2008，4(7)：4-6.(in Chinese))
[8]
孟祥跃，丁雁生，陈 力，等. 煤与瓦斯突出的二维模拟实验研究[J]. 煤炭学报，1996，21(1)：57-62.(MENG Xiangyue，DING Yansheng，CHEN Li，et al. 2D simulation test of coal and gas outburst[J]. Journal of China Coal Society，1996，21(1)：57-62.(in Chinese))
2017, Vol. 36 
