BAI Bing, LI Xiao-chun, LIU Yan-feng, et al. Preliminary theoretical study on impact on coal caused by interactions between CO2 and coal[J]. 2007, 28(4).
BAI Bing, LI Xiao-chun, LIU Yan-feng, et al. Preliminary theoretical study on impact on coal caused by interactions between CO2 and coal[J]. 2007, 28(4).DOI:
Regarding the solid surface energy decrease as a result of adsorption of gas as the reason why the solid skeleton swells. A theoretical formula is given to estimate the swelling stress without displacement constraint
which is an appropriate assumption as the initial underground stress is so large. The swelling stresses caused by CO2 and CH4 respectively are compared. This is helpful in evaluating the mechanical stability in CO2-ECBM. Then another formula is given to evaluate the coal strength decrease caused by the CH4 or CO2 adsorption; the formula is helpful in evaluating the mechanical properties change and the mechanical stability after the adsorption of gases in CO2-ECBM