煤层赋存条件对煤与瓦斯突出危险性的影响研究

Effects of coalbed occurrence conditions on risk of coal and gas outburst

为研究煤层赋存条件对煤与瓦斯突出危险性的影响,模拟分析不同条件(埋藏深度、煤层厚度和煤体强度)下的应力、瓦斯压力和煤体塑性变形区的分布及变化。结果表明,随埋藏深度的增加,工作面前方应力峰值及应力梯度、瓦斯压力梯度、塑性变形区及塑性应变量等随之增大,煤与瓦斯突出的危险性越来越高;随煤层厚度的增加,工作面应力峰值、应力梯度逐渐减小,出现应力峰值的位置越远离工作面,瓦斯卸压带、瓦斯排放带、塑性变形区越逐渐增大,煤与瓦斯突出的危险性越来越小;随煤体强度的升高,工作面前方应力梯度、瓦斯压力梯度随之增大,塑性变形区和塑性应变值随之减小,煤与瓦斯突出危险性越来越小。

To explore effects of coalbed occurrence conditions on risk of coal and gas outburst, distribution of and variation in the stress, gas pressure and plastic deformation zone were simulated and analyzed for different coalbed occurrence conditions （buried depth, thickness of coal seam and strength of coal body）. The results show that the bigger burial depth of coal seam is, in front of the working face, the higher the peak stress, stress gradient, gas pressure gradient are, and the bigger plastic deformation zone and plastic strain are, and the higher there is a positive correlation between the risk of coal and gas outburst and the burial depth of coal seam, that there is a negative correlation between the risk and the thickness of coal seam, and that there is a negative correlation between the risk and the strength of coal body.