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

Figure 3

Deviatoric stress-strain relation curve of raw and Sc-CO₂-treated coal samples (black line = raw sample, red line = 12 h treated, and blue line = 48 h treated) under different confining pressures ((a) confining pressure 0 MPa, (b) confining pressure 2 MPa, (c) confining pressure 4 MPa, (d) confining pressure 6 MPa).

(a)

(b)

(c)

(d)