受载原煤中瓦斯的扩散规律

为研究受载原煤中瓦斯的扩散规律，以原煤煤样为实验对象，利用自主研发的含瓦斯煤热流固耦合实验系统，在恒温的三轴加载条件下，进行了加载-吸附-解吸-再加载直至煤样破坏过程中的瓦斯解吸实验。研究结果表明，受载原煤的解吸量随时间变化规律符合颗粒煤瓦斯解吸的数学模型；在恒温恒围压下，随轴压的增大，受载原煤瓦斯的解吸量呈下降趋势；当轴压大于峰值强度后，瓦斯解吸量随轴压迅速增大；受载原煤煤样压密、线弹性阶段瓦斯解吸-运移速度随应力增大而线性减小；当煤样处于屈服阶段和峰值破坏阶段瓦斯解吸-运移速度随应力增大呈指数式增长。研究成果对瓦斯抽采，瓦斯突出机理研究有一定的理论价值。 

Experimental investigation of gas desorption law of loaded raw coal

To investigate the gas desorption law of loaded raw coal,raw coal samples were used as experimental subjects. The gas desorption experiments were carried out with raw coal samples under tri-axis loading conditions at a constant temperature 30. The gas desorption law of raw coal samples℃,which were tested during the process of loading-absorption-desorption-reloading until destruction was obtained by using the self-developed coupled thermo-hydro-mechanical system. The results showed that the desorption law of loaded coal can be described by the desorption mathematical model of particle coal. The desorption amount of loaded raw samples decreases with the axial-pressure under constant temperature and confining pressure. However, the gas desorption amount increases significantly when the axial-pressure is over the peak strength. The gas desorption and migration velocity shows linear decrease with the axial-pressure during the stage of compaction and linear elasticity, and exponential increase in the yield stage and peak stage. The results have some theoretical significance for gas drainage and the study of the mechanism of gas outburst.