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根据煤岩体介质变形与瓦斯渗流的基本理论,考虑到煤岩体介质的非均匀性等特点及煤岩体破裂过程中煤岩体变形和瓦斯压力之间的耦合作用,建立了煤岩破裂过程气固耦合作用的RFPA2D-GasFlow模型,对含瓦斯煤岩体和不含瓦斯煤岩体开采过程中应力场的变化进行了对比研究。结果表明,随着开采的进行,采场煤岩体中的应力场在不断发生变化,应力峰值随开采的进行不断向工作面前方转移,而且其值也在不断变大,峰值增加的幅度及工作面前方的应力梯度随开采的进行逐渐增大。
According to the basic theory of medium deformation and gas seepage of coal and rock mass, taking into account the heterogeneity of coal and rock mass media and the coupling between coal and rock deformation and gas pressure in the process of coal and rock mass rupture, the coal and rock fracture The RFPA2D-GasFlow model of the process gas-solid coupling is used to study the changes of stress field in the process of mining with and without gas coal and rock mass. The results show that as the mining progresses, the stress field in the coal and rock mass of the stope changes continuously. The peak value of stress continuously shifts to the front of the work surface as the mining progresses. The stress gradient in front of working face gradually increases with the mining.