不同温度下型煤吸附解吸变形规律的研究

采用自主研制的高压瓦斯煤岩吸附-解吸测试系统,进行了型煤在不同温度条件下的吸附-解吸变形全过程试验,对型煤吸附与解吸瓦斯产生变形进行了研究。研究结果表明,型煤在不同温度条件下随时间的变形曲线具有相同的变化规律,即先后经历快速膨胀变形、缓慢膨胀至平衡变形、卸压瞬时膨胀变形、快速收缩变形、缓慢收缩至平衡变形5个阶段;型煤的吸附膨胀和解吸收缩曲线均具有朗格缪尔方程和幂函数方程特征;型煤在吸附过程中的膨胀变形具有各向异性,在解吸过程的收缩变形具有各向同性,解吸平衡的残余体应变与温度呈负相关。

Research on Adsorption and Desorption Deformation of Briquette at Different Temperatures

In order to explore the unique mechanical behavior of swelling deformation and contraction deformation effect of coal briquette each induced by gas adsorption and desorption,the whole process test of adsorption-desorption deformation of coal briquette at different temperature gradients is carried out by using the self-developed coal adsorption-desorption deformation test system.The results show that the deformation curve of the coal briquette specimen under different temperature have the same evolution law on time,namely rapid expansion deformation,slow expansion to equilibrium deformation,pressure relief instantaneous expansion deformation,rapid desorption deformation,and slow desorption to equilibrium deformation in 5 stages;the adsorption expansion and desorption shrinkage curves of briquette have the characteristics of Langmuir equation and power function equation;the expansion deformation of briquette during adsorption has anisotropy,and the shrinkage deformation during desorption is isotropic,desorption equilibrium residual body strain is inversely related to temperature.