三轴条件下煤样瓦斯运移全过程变形特征

doi:10.16265/j.cnki.issn1003-3033.2026.08.1534

摘要/Abstract

摘要：

为揭示煤岩瓦斯动力灾害发展过程中瓦斯运移和煤体变形耦合关系,通过不同煤样瓦斯吸附-解吸-渗流全过程变形试验,系统分析煤体瓦斯运移全过程变形特征与三轴条件关联性,明确瓦斯压力与轴向应力对煤体变形的影响。结果表明:煤体吸附瓦斯变形与渗流瓦斯变形的时间演化特征高度一致,均呈初期快速增长、中期缓慢增长和末期相对稳定趋势;煤体瓦斯解吸变形表现为初期快速衰减、中期缓慢衰减和末期相对稳定趋势;瓦斯压力对煤体吸附-解吸-渗流瓦斯变形过程具有促进作用,而轴向应力起抑制作用;瓦斯压力对煤体变形的影响程度比轴向应力更为显著,孔隙连通性较差的煤体变形达到相对稳定的时间显著延长,孔隙连通性较好的煤体对瓦斯压力和轴向应力响应更加敏感。

关键词: 三轴条件, 瓦斯运移, 变形特征, 吸附-解吸-渗流, 瓦斯压力, 轴向应力

Abstract:

To reveal the coupling relationship between gas migration and coal deformation during the development of coal-gas dynamic disasters, full-process deformation tests covering gas adsorption, desorption and seepage were carried out on various coal samples. The correlation between the deformation characteristics of coal mass throughout gas migration and triaxial stress conditions was systematically analyzed, and the effects of gas pressure and axial stress on coal deformation were clarified. The results show that the temporal evolution characteristics of gas adsorption-induced deformation and gas seepage-induced deformation are highly consistent and both present a trend of rapid growth in the initial stage, slow growth in the middle stage and relative stabilization in the final stage. Gas desorption-induced deformation of coal mass follows a trend of rapid decay in the initial stage, slow decay in the middle stage and relative stabilization in the final stage. Gas pressure promotes the whole process of coal deformation induced by gas adsorption-desorption-seepage, while axial stress exerts an inhibitory effect. The influence of gas pressure on coal deformation is more significant than that of axial stress. For coal masses with poor pore connectivity, the time for deformation to reach relative stabilization is significantly prolonged, whereas coal masses with favorable pore connectivity are more sensitive to gas pressure and axial stress.

Key words: triaxial stress conditions, gas migration, deformation characteristics, adsorption-desorption-seepage, gas pressure, axial stress

中图分类号:

X936

孔祥国, 贠泽昊, 林海飞, 季鹏飞, 和递, 杨送瑞. 三轴条件下煤样瓦斯运移全过程变形特征[J]. 中国安全科学学报, 2026, 36(8): 84-94.

Kong Xiangguo, Yun Zehao, Lin Haifei, Ji Pengfei, He Di, Yang Songrui. Deformation characteristics of coal samples during entire process of gas migration under triaxial stress conditions[J]. China Safety Science Journal, 2026, 36(8): 84-94.

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