不同温度、压力下煤体吸附瓦斯变形特征研究

Research on the adsorption gas deformation characteristics of coal mass under different temperatures and pressures

为了探讨煤体在不同物理场耦合作用下吸附瓦斯后的膨胀变形特征,以型煤为研究对象,利用自行研发的高压瓦斯煤岩吸附-解吸测试系统对型煤进行了不同温度、不同压力下的吸附变形试验。试验结果表明,随着温度的升高,煤体吸附瓦斯量呈减小趋势,其轴向变形和环向变形量均有所降低;在相同温度条件下,随着压力的升高,型煤试件的变形量和变形速度均有所降低;不同温度、压力下,幂指数函数对于型煤试件吸附、解吸过程中的应变变化的拟合效果要明显优于朗格缪尔形式公式。

In order to explore the expansion deformation characteristics of coal mass under the effect of different physical field coupling after gas adsorption, taking coal briquette as research object, using high pressure gas adsorption-desorption coal and rock testing system to conduct adsorption deformation test under different temperatures and pressures. The test results showed that with the increase of temperature, coal gas adsorption quantity showed a trend of decrease, the axial and toroidal deformation were both reduced. Under the same temperature condition, with the increase of pressure, the magnitude and speed of deformation of coal specimen were reduced. Under conditions of different temperatures and pressures, the fitting effect of the power exponential function on strain changes was significantly better than Langmuir Formula in the process of adsorption and desorption