In order to investigate the deformation laws of coal rock under different gas adsorption-desorption conditions,the corresponding study was conducted based on an experimental system.The results showed that the coal rock would generate the expansion deformation after the gas adsorption,while generate the shrinkage deformation after the gas desorption.The a-mount of deformation was directly related to the pore fracture structure and gas pressure of the coal rock.The coal sample with the granularity of 0.85 mm had the maximal adsorption deformation amount under the same gas pressure,while the a-mount of deformation was relatively sensitive to the change of gas pressure,and the maximal deformation caused by the ab-sorption was 1118με.The coal sample with the granularity of 0.42mm had the minimal deformation amount under the same gas pressure.After the gas adsorption,the coal rock generated the expansion deformation,and after the gas desorption,the coal rock could not recover to its initial state completely,with the presence of some residual deformation amount.The data a-nalysis showed that the residual deformation amount presented an exponential function relationship with the gas pressure,and it was affected by the pore fracture structure and adsorption characteristics of the coal rock.The results can provide support to the gas prevention and control and the gas drainage in coal mines,as well as the research on the mechanical properties of gas-containing coal rock.%为了掌握煤岩材料在不同吸附-解吸瓦斯条件下的变形规律,基于实验系统开展了相关研究,研究结果表明:煤岩材料在吸附瓦斯后可产生膨胀变形,发生瓦斯解吸时会产生收缩变形,这一变形量与煤岩材料的孔裂隙结构和瓦斯压力有直接关系,实验采用的0.85mm粒度的煤样在同等瓦斯压力条件下其吸附变形量最大,变形量受瓦斯压力变化比较明显,由吸附产生的最大变形为1118με,实验采用的0.42 mm粒度煤样在相同瓦斯压力条件下变形量最小;煤岩瓦斯吸附产生膨胀变形,且煤岩瓦斯解吸后并不能完全恢复至初始状态,存在一定的残余变形量,数据分析得出残余变形量与瓦斯压力呈指数函数关系,并受煤岩孔隙结构和吸附特性影响.可为矿井瓦斯防治、瓦斯抽放及含瓦斯煤岩的力学性质的研究提供支撑.
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