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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。
In order to study the influence of coal seams occurrence conditions on the coal and gas outburst hazards, the distribution and changes of stress, gas pressure and plastic deformation zone under different conditions (burial depth, coal seam thickness and coal seam strength) were simulated. The results show that with the increase of burial depth, the peak stress and stress gradient, gas pressure gradient, plastic deformation zone and plastic strain in front of working face increase with the increase of burial depth, and the risk of coal and gas outburst increases. With the increase of burial depth , The stress peak of face and stress gradient gradually decrease, and the position of stress peak farther away from working face. The gas pressure relief zone, gas discharge zone and plastic deformation zone gradually increase, and the risk of coal and gas outburst more and more As the strength of coal increases, the stress gradient and gas pressure gradient in front of working face increase. The plastic deformation zone and plastic strain value decrease accordingly, and the risk of coal and gas outburst decreases.