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总览 评价 祝捷 * ， 唐俊 ， 传李京 ， 王学 （ 中国矿业大学（北京）力学与建筑工程学院，北京，100083； ） 摘要： 含瓦斯煤体变形规律是研究煤与瓦斯耦合力学作用的重要问题。针对煤吸附/解吸气体过程的变形特征，对煤体孔隙度方程的隐函数求导，将具有
祝捷*， 唐俊， 传李京， 王学
（
中国矿业大学（北京）力学与建筑工程学院，北京，100083； ）
摘要：
含瓦斯煤体变形规律是研究煤与瓦斯耦合力学作用的重要问题。针对煤吸附/解吸气体过程的变形特征，对煤体孔隙度方程的隐函数求导，将具有时变性的孔隙度方程引入有效应力系数中，由此建立煤吸附解吸气体变形问题的力学模型；模型的数值计算结果表明，煤样吸附/解吸气体产生膨胀/收缩变形，变形随时间的增加而增大，直到气体在煤中吸附/解吸达到平衡，煤样的变形才稳定不变；气体压力对煤样的吸附/解吸变形平衡时间以及平衡变形量产生影响，气体压力越大，吸附/解吸变形平衡所用的时间越短，平衡时煤样体积应变越大；煤样吸附变形与气体吸附性相关，吸附性更强的CO2气体比CH4气体促使煤样产生更大的膨胀变形。模型计算结果与以往实验研究结论一致，可见建立的力学模型反映了煤吸附解吸气体的变形特征。
关键词：
煤体变形；吸附解吸；吸附平衡；气体压力；气体吸附性
Zhu Jie*， Tang Jun， Chuan Lijing， Wang Xue
（
School of Mechanics & Civil Engineering, China University of Mining and Technology (Beijing),Beijing,100083； ）
Abstract：
The deformation characters of coal containing methane have been recommended as one of important issues on coal-gas interaction mechanism. To investigate coal strain due to gas sorption/desorption, in this work, a model of coal strain induced by gas sorption/desorption was presented by means of deriving the implicit function of coal porosity included in the effective stress coefficient. The numerical results of indicated that coal swelling/shrinkage due to gas sorption/desorption increased with the time. Coal strain was constant in the sorption/desorption equilibrium. Gas pressure around coal samples had an effect on the equilibrium time and coal volumetric strain of sorption/desorption. The higher gas pressure was given, the greater coal samples due to sorption swelled and the shorter the deformation coal samples lasted. Gas adsorbability also influenced coal strain induced by sorption. Coal adsorbing CO2 swelled greater than that adsorbing CH4. The numerical results were in agreement with previous experimental conclusions. Therefore this model reflected the features of coal strain due to sorption/desorption.
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