含瓦斯煤的吸附量与孔隙率及变形的映射规律研究

Study on the mapping law of adsorption, porosity and deformation of gas bearing coal

为厘清含瓦斯煤的吸附量与孔隙率及变形的映射规律,以高压容量法测试煤吸附瓦斯等温曲线的过程为条件,针对煤样在不同瓦斯压力的作用下,吸附量对煤孔隙率、变形的影响进行了理论分析;利用工业CT技术与高压容量法相结合的方法,研究含瓦斯煤的吸附量与孔隙率、变形的映射规律。结果表明:随着吸附瓦斯量的增加,煤的孔隙率逐渐降低,并趋于稳定值;煤的变质程度越高,其孔隙率演化的趋势越缓;煤的体积应变呈现近似于线性增长的特征。

In order to clarify the mapping law of adsorption capacity, porosity and deformation of gas bearing coal, the influence of adsorption amount on porosity and deformation of coal sample under different gas pressures was analyzed theoretically based on the process of testing isothermal curve of coal adsorbing gas by high pressure volumetric method;the adsorption capacity of gas bearing coal was studied by combining industrial CT technology and high pressure capacity method. The results show that with the increase of adsorbed gas, the porosity of coal gradually decreases and tends to a stable value;the higher the coal metamorphism degree is, the slower the porosity evolution trend is;the volume strain of coal presents approximate linear growth.