| The values of crack initiation strength | Different lateral pressure (MPa) | ||||
| 0 | 1 | 5 | 10 | ||
| Analytical values | 14.0 | 16.7 | 27.51 | 41.03 | |
| Experimental values | 15.3 | 17.0 | 29.0 | 42.2 | |