地应力对突出煤瓦斯渗流影响试验研究

 以典型煤与瓦斯突出矿井松藻矿务局打通一矿原煤制备的试样为研究对象，利用自行研制的自压式三轴渗透仪及MTS815型力学试验机，进行固定瓦斯压力及不同围压情况下突出煤试样试验研究。结果表明：在相同围压下，突出煤试样渗流速度随着轴压的增加，表现为先下降后升高，达到应力峰值后，先下降然后趋于稳定；试样在峰后的渗流速度随着围压增大而降低，当围压达到4 MPa以后，渗流速度下降缓慢，几乎保持定值。建立渗流速度–轴压的全过程方程，推导出反映出瓦斯梯度变化的渗流速度–轴向应变关系曲线。

EXPERIMENTAL RESEARCH ON EFFECT OF GEOSTRESS ON OUTBURST COAL'S GAS SEEPAGE

Based on the typical coal and gas outburst of Datong mine in Songzao，the experiment of outburst coal¢s gas seepage under stationary gas pressure and different confining pressures is conducted by MTS815 mechanical testing machine and self-developed servo-controlled triaxial load system. The results show that the seepage velocity of outburst coal¢s specimen drops at first and rises later with increasing axial stress，but decreases and keeps stable after peak stress. The seepage velocity after peak stress decreases with the increase of confining pressure，and keeps stable after the confining pressure reaches 4 MPa. The complete process equation of seepage velocity-axial stress is built. The relationship curve of seepage velocity-strain，which reflects the change of gas gradient，is derived.