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由于煤层瓦斯压力的影响因素多且复杂,通过建立理论模型,得出了煤层瓦斯压力与煤层埋深、煤岩弹性模量、泊松比、温度梯度和地应力梯度等影响因素的关系式,并结合数值分析,对煤层瓦斯压力与其相关影响因素的关系进行了分析。通过分析得出,煤层瓦斯压力随着煤层埋深的增加而变大,在同一煤层埋藏深度,煤层瓦斯压力随弹性模量、泊松比、温度梯度的增加而降低,随地应力梯度的增加而增大。同时,煤层瓦斯压力梯度随煤岩弹性模量和泊松比的增大而增大,当煤岩弹性模量和泊松比较小时,煤层瓦斯压力梯度的变化率较小,当煤岩弹性模量和泊松比较大时,煤层瓦斯压力梯度的变化速率迅速增加。煤层瓦斯压力梯度随温度梯度和地应力梯度的增大而增大,基本呈线性变化。
Because of the many and complicated factors affecting gas pressure in coal seam, the relationship between gas pressure and depth of coal seam, elastic modulus of coal and rock, Poisson’s ratio, temperature gradient and geostress gradient are obtained by establishing theoretical model. Combined with numerical analysis, the relationship between coal seam gas pressure and its related influencing factors is analyzed. The analysis shows that the gas pressure of coal seam increases with the increase of coal seam depth. With the same coal seam depth, the gas pressure of coal seam decreases with the increase of elastic modulus, Poisson’s ratio and temperature gradient. With the increase of ground stress gradient Increase. At the same time, the gas pressure gradient of coal seam increases with the increase of elastic modulus and Poisson’s ratio of coal. When the elastic modulus and Poisson’s ratio of coal are small, the change rate of gas pressure gradient of coal seam is small. When the pine is relatively large, the rate of change of gas pressure gradient in coal seam rapidly increases. The gas pressure gradient of coal seam increases with the increase of temperature gradient and geostress gradient, and changes linearly.