煤体吸附瓦斯膨胀变形效应的试验研究

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Abstract 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.

Key words： mining engineering coal and gas outburst coal containing gas gas adsorption swelling effect gas permeability

Received: 24 May 2010

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https://rockmech.whrsm.ac.cn/EN/Y2010/V29/I12/2484

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