Research Article
Experimental Evaluation of the Influences of Water on the Fracture Toughness of Mudstones with Bedding
Table 8
The tensile strength and the fracture process zone of the three types of mudstone specimens.
| | Specimen type (A, B, C) | t (mins) | KIc (MPa m0.5) | σt (MPa) | rc (mm) |
| | Type A | 0 | 4.895 | 4.895 ± 10−4 | 4.80 | | 50 | 4.639 | 4.618 ± 10−4 | 4.54 | | 100 | 4.352 | 4.304 ± 10−4 | 4.09 | | 200 | 3.915 | 3.995 ± 10−4 | 3.65 | | 300 | 3.557 | 3.803 ± 10−4 | 3.15 |
|
Type B | 0 | 0.820 | 4.626 ± 10−4 | 5.00 | | 50 | 0.745 | 4.312 ± 10−4 | 4.75 | | 100 | 0.623 | 3.717 ± 10−4 | 4.47 | | 200 | 0.548 | 3.435 ± 10−4 | 4.05 | | 300 | 0.452 | 2.933 ± 10−4 | 3.78 |
|
Type C | 0 | 0.730 | 4.441 ± 10−4 | 4.30 | | 50 | 0.640 | 4.062 ± 10−4 | 3.95 | | 100 | 0.508 | 3.378 ± 10−4 | 3.60 | | 200 | 0.315 | 2.354 ± 10−4 | 2.85 | | 300 | 0.214 | 1.886 ± 10−4 | 2.05 |
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