Time-Dependence of Mechanical Property Alterations on Anthracite Coals Treated by Supercritical Carbon Dioxide

Table 3

Experimental results of Young’s modulus and Poisson’s ratio obtained from each test.

Coal samples	Confining pressure (MPa)	Young’s modulus (MPa)	Poisson’s ratio (%)
		Measured	Average	Measured	Average
Raw coal samples	0	3668	4054	0.24	0.26
	2	3959		0.26
	4	4225		0.25
	6	4364		0.27
Samples treated with Sc-CO2 for 12 h	0	2716	3040	0.30	0.31
	2	2920		0.29
	4	3102		0.32
	6	3422		0.33
Samples treated with Sc-CO2 for 48 h	0	2136	2432	0.33	0.34
	2	2372		0.32
	4	2582		0.35
	6	2638		0.36