Table 2.
Model parameter identification results in the loading condition.
| Confining pressure (MPa) | Deviator stress (MPa) | G1 (MPa) | K (MPa) | G2 (MPa) | η1 (MPa·h) | G3 (MPa) | λ | η20 (MPa·h) | η3 (MPa·h) | α | R2 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 4 | 11.99 | 2.1897 | 0.8397 | 3.1868 | 0.8560 | 4.5325 | 1.1306 | 20.6966 | – | – | 0.9985 |
| 14.99 | 1.8054 | 0.6923 | 8.5186 | 29.3340 | 5.9157 | 0.0703 | 41.2052 | – | – | 0.9999 | |
| 17.99 | 1.7483 | 0.6704 | 9.5215 | 54.3465 | 9.4636 | 0.0197 | 526.1619 | – | – | 0.9998 | |
| 20.97 | 1.7528 | 0.6721 | 24.6182 | 8.5060 | 15.0339 | 0.7525 | 111.0539 | – | – | 0.9891 | |
| 23.98 | 1.7970 | 0.6891 | 0.7516 | 98.8947 | 7.0724 | 0.7844 | 563.5199 | 0.9983 | 11.0271 | 0.9940 | |
| 8 | 16.61 | 2.8090 | 1.0771 | 5.4367 | 20.0173 | 3.2480 | 0.0734 | 67.9943 | – | – | 0.9955 |
| 20.76 | 2.4951 | 0.9568 | 9.6333 | 27.2050 | 5.6150 | 1.3492 | 5945.3221 | – | – | 0.9966 | |
| 24.91 | 2.3964 | 0.9189 | 13.0854 | 1.7946 | 7.2915 | 0.0517 | 2727.9462 | – | – | 0.9977 | |
| 29.06 | 2.3662 | 0.9074 | 26.9699 | 190.1968 | 21.7746 | 0.4552 | 51.7417 | – | – | 0.9989 | |
| 33.22 | 2.3836 | 0.9140 | 14.5633 | 3.4097 | 0.1586 | 0.8631 | 41.7628 | 3.6402 | 101.5259 | 0.9959 | |
| 12 | 22.48 | 3.5610 | 1.3655 | 5.4102 | 1.1492 | 5.4725 | 1.0255 | 28.4761 | – | – | 0.9988 |
| 28.11 | 3.2033 | 1.2283 | 16.4465 | 26.5952 | 9.3529 | 0.2514 | 38.4888 | – | – | 0.9983 | |
| 33.73 | 3.0032 | 1.1516 | 16.1156 | 33.9204 | 38.9416 | 3.6305 | 11.6831 | – | – | 0.9999 | |
| 39.35 | 2.9572 | 1.1340 | 22.6859 | 17.2281 | 9.7773 | 0.3595 | 155.3223 | – | – | 0.9967 | |
| 44.97 | 2.8691 | 1.1001 | 12.6050 | 10.7597 | 2.6264 | 1.5966 | 143.0431 | 1.1562 | 170.0202 | 0.9991 |