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以贵州矿区林华煤矿9号煤层的原煤试件为研究对象,借助自主研发出口压力可调的三轴渗流装置,开展了不同孔隙压力及温度作用下的三轴渗流试验。研究表明:当进口瓦斯压力恒定,孔隙压力在1.8~2.4 MPa之间变化时,含瓦斯原煤渗透率随孔隙压力变化呈递增的指数函数关系;当孔隙压力不变时,含瓦斯原煤渗透率随温度升高而下降,但下降幅度随温度而异,两者服从乘幂函数分布;若压差不变时,含瓦斯原煤渗透率随温度升高而下降;温度恒定时,含瓦斯原煤渗透率则随压差增大而减小。借助上述试验结果,推导了含瓦斯原煤渗透率受孔隙压力和温度耦合作用的函数关系式。
Based on the coal sample of No. 9 coal seam of Linhua Coal Mine in Guizhou Mining Area, the triaxial seepage test under different pore pressure and temperature was carried out with the self-developed triaxial seepage device with adjustable outlet pressure. The results show that when the pressure of inlet gas is constant and the pore pressure varies from 1.8 to 2.4 MPa, the permeability of coal-bearing gas increases exponentially with the change of pore pressure. When the pore pressure is constant, the permeability of raw coal gas Temperature increases and decreases, but the decline with temperature varies, both subject to the power function distribution; if the pressure is constant, the permeability of coal-bearing gas decreases with increasing temperature; constant temperature, the permeability of coal-bearing gas It will decrease with the increase of differential pressure. Based on the above test results, the functional relationship between gas permeability and pore pressure and temperature is deduced.