Modified Nishihara Rheological Model considering the Effect of Thermal-Mechanical Coupling and Its Experimental Verification

Table 2

The sandstone’s strain values.

Axial stress/MPa	Confining pressure/MPa	Strain/10^−6
		ε1	ε3	εv
35	3	1420	−734	−47.2
65	3	2850	−1916	−982.8
100	3	2070	−2440	−2810
135	3	1870	−2890	−3970
175	3	2270	−4680	−7020
Cumulative strain/10^−6		10480	−12660	−14830

ε₁, ε₃, and ε_v in the table represent axial strain, hoop strain, and volumetric strain, respectively; hoop strain is negative at outward expansion.