EXPERIMENTAL STUDY OF SWELLING DEFORMATION EFFECT OF COAL INDUCED BY GAS ADSORPTION
EXPERIMENTAL STUDY OF SWELLING DEFORMATION EFFECT OF COAL INDUCED BY GAS ADSORPTION
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发表时间：
2010
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通讯作者：
L. Yanbao;Cao Shugang;L. Yong;W. Jun;G. Ping;X. Jian;Bai Yanjie
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作者：
L. Yanbao;Cao Shugang;L. Yong;W. Jun;G. Ping;X. Jian;Bai Yanjie
为了研究瓦斯吸附引起煤体膨胀变形效应的独特力学行为，采用自主研发的含瓦斯煤细观力学测试装置，进行了不同瓦斯压力下的吸附膨胀变形试验。结果表明：（1）同一煤样在不同瓦斯压力下的膨胀变形与时间曲线具有相同的变化规律，煤样的应变变化率随时间减小，直至达到稳定值。（2）煤样的膨胀变形呈现各向异性，总趋势垂直于层理和平行于层理的应变一致。由于煤体内部裂纹分布不同，垂直于层理的变形大于平行于层理的变形。(3)煤的瓦斯吸附量与其体积应变呈现良好的线性关系。在此基础上，综合考虑温度、水分、灰分、各向异性等因素，建立了膨胀变形方程。(4)利用吸收变形应力与约束变形的线性关系以及吸附变形与体积应变的关系，建立了煤的膨胀变形方程。 (5)煤体的吸附膨胀变形是不可逆的，随着吸附瓦斯压力的增大，残余应变值增大。煤体瓦斯吸附引起的膨胀变形效应具有重要的工程应用价值，可作为煤层突出风险评价的辅助指标，也可用于煤层瓦斯渗透率研究。
In order to investigate the unique mechanical behavior of swelling deformation effect of coal induced by gas adsorption,the self-developed meso-mechanical testing apparatus of coal containing gas is used to perform the adsorbed swelling deformation test under different gas pressures.The results show as follows:(1) The swelling deformation and time curves of the same coal specimen under different gas pressures have the same variation law.The strain change rate of coal specimen decreases with time until it reaches a stable value.(2) The swelling deformation of coal specimen shows anisotropy.The total trends of strains perpendicular to the bedding and parallel to the bedding are consistence.Because crack distributions are different in the coal,the deformation perpendicular to the bedding is greater than that parallel to bedding.(3) The gas adsorption quantity of coal and its volumetric strain present a good linear relationship.Based on this,the swelling deformation equation is established considering temperature,moisture,ash,anisotropy and other factors.(4) Using the linear relationship between absorbed deformation stress and constrained deformation,and relationship of adsorption deformation and gas pressure,the calculation method of absorbed swelling stress is obtained.(5) The adsorbed swelling deformation of coal is irreversible;and the value of residual strain increases as the adsorbed gas pressure becomes larger.Swelling deformation effect of coal induced by gas adsorption is important for engineering application.It can be used as an assistant index of coal seam outburst risk assessment,and also can be used in gas permeability study of coal seam.