Visco-Elastoplastic Constitutive Fatigue Model for Rocks

Table 3

NVPFM parameters of the water-rich soft rock under 20 kPa confining pressure when is 0.5.

	(kPa)	K (kPa)	G1 (kPa)	G2 (kPa)	(kPa·s)	(kPa·s)	R^2
0.05	73.744	−5.894 × 10^9	2.229 × 10^4	3.227 × 10^4	1.026 × 10^7	4.100 × 10^5	0.992
0.1	83.771	5.694 × 10^3	-2.259 × 10^3	2.070 × 10^4	3.808 × 10^6	1.634 × 10^5	0.999
0.15	95.160	2.780 × 10^4	-2.030 × 10^4	1.906 × 10^4	3.744 × 10^6	2.233 × 10^5	0.999
0.2	108.098	8.404 × 10^4	-2.643 × 10^8	1.417 × 10^4	4.463 × 10^6	2.078 × 10^4	0.997
0.3	232.273	6.493 × 10^4	-1.131 × 10^9	1.656 × 10^4	3.416 × 10^6	2.030 × 10^5	0.999