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利用自行研制的煤岩热流固耦合实验系统,以原煤为研究对象,进行不同卸轴压起始应力条件下原煤变形及渗透特性的实验研究。结果表明:(1)卸轴压时,原煤轴向应力–应变关系可用二次函数表示;原煤变形模量随卸轴压起始应力的升高而减小。(2)随着轴压的降低,原煤渗透率上升速率逐渐增大;卸轴压过程中,原煤渗透率的增长趋势随卸轴压起始应力的增大而平缓;线弹性阶段不同起始应力卸轴压,原煤渗透率的变化具有较好的相似性。(3)原煤瓦斯增透效果随卸轴压起始应力的增大而减弱,卸除单位应力时渗透率相对值的增加量与卸轴压起始应力的关系可以用对数函数表示;随着卸轴压起始应力的增大,卸轴压过程中增透率的增长趋势逐渐减弱。
Using the self-developed coal-rock thermal-fluid-solid coupling experimental system, the raw coal was taken as the research object, and the experimental study on deformation and permeability of raw coal under different unloading axial compression stress was carried out. The results show that: (1) The axial stress-strain relationship of raw coal can be represented by quadratic function when unloading axial pressure; the deformation modulus of raw coal decreases with the increase of initial stress of unloading axial compression. (2) With the decrease of axial pressure, the rate of increase of raw coal permeability increases gradually. During the process of unloading axial pressure, the trend of increase of permeability of raw coal is gentle with the increase of initial stress of unloading axial compression; Stress unloading axial pressure, coal permeability changes have good similarities. (3) The effect of methane anti-seepage of raw coal is weakened with the increase of the initial stress at unloading and the relation between the increase of relative permeability and the initial stress at unloading is expressed by the logarithmic function. With Unloading axial pressure increases the initial stress, unloading axial pressure increase in the process of increasing the trend gradually weakened.