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温度—压力耦合作用下深井煤样中吸附气体运移实验研究
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摘要
针对深部煤层开采中煤层中吸附瓦斯气体异常运移诱发工程灾害,开展在温度-应力耦合下煤岩变形与吸附气体运移的实验理论研究具有十分重要的科学意义。利用白主研发的深部软岩T-P耦合吸附气体运移实验系统观察和研究了不同矿区原煤中吸附气体在温度、温度-压力作用下解吸运移过程。通过分析不同温度条件下从原煤解吸出的吸附气体压力、流量和浓度值,获得了原煤中原生吸附气体解吸时的临界温度,发现煤体温度高于30℃后吸附气体开始大量解吸扩散;在恒温和升温条件下对煤样进行单.轴压缩破坏和对破坏煤样施加围压,观察到煤岩变形对吸附气体运移产生吸气与排气。为此,本文分别从不同温度下煤中吸附气体解吸特征、温度-压力耦合下煤中吸附气体解吸特征进行系统研究。借助单孔隙扩散模型和Arrhenius方程分别计算原煤在不同温度下吸附气体的表观扩敞率变化和表观解吸能,进一步揭示煤中不同吸附气体解吸扩散特征:讨论并利用数值模拟手段闸释孔隙结构变化对煤吸附气体运移影响。此外,在实验中还发现解吸出气体浓度影响煤的力学强度,从热力学角度解释这种现象。
The present paper focuses on the transport process of adsorbed gas within the raw coal, to understand the complex physical mechanism over the gas emission with the gradual development of coal damage. A uniaxial test apparatus for stressed coal was especially developed to simultaneously measure deformation and gas pressure as well as gas flux during test, taking the characteristics of gas transport into consideration under stress-temperature conditions. Gas composition and its concentration were detected at different time intervals by chromatography technique. Results show that original gas adsorbed in raw coal tends to be desorbed considerably over 30℃with the heating rate of 0.5℃/min. Based on unipore diffusion model and Arrhenius equation, apparent diffusivity and apparent desorbed energy for different adsorbent were calculated respectively with elevated temperature. The uniaxial compressive tests for the coal samples were conducted to investigate the desorption process of adsorbed and free gas under different isothermal conditions. At the failure stage, the pressure of desorption gas released from the stressed coal underwent a rapid transition from negative to positive, which can be described as a "breathing effect". As a consequence, the clustered cracks enhanced the gas reservoir and also influenced the gas pressure within the coal samples. Increasing temperature not only results in the thermal expansion of coal matrix and further widens the aperture of existing pore and clear, but trigger the desorption of original gas within coal, which also lead to the shrinkage of coal matrix. It can be able to improve the porosity of coal and reduce the effective area of specimen, which lead to the decline of uniaxial compressive strength and elastic module.
引文
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