Research Article
Experimental Evaluation of the Influences of Water on the Fracture Toughness of Mudstones with Bedding
Table 3
Mode I fracture toughness of Type B mudstone specimens for different soaking times.
| Specimen number | Soaking time t (minutes) | Peak load Pcr (N) | Mode I fracture toughness KIc (MPa m0.5) | Degradation degree (%) | Test value | Average value |
| BI0-1 | 0 | 1768.1 ± 0.01 | 0.817 | | | BI0-2 | 0 | 1839.5 ± 0.01 | 0.850 | 0.820 | 0 | BI0-3 | 0 | 1716.2 ± 0.01 | 0.793 | | | BI50-1 | 50 | 1603.6 ± 0.01 | 0.741 | | | BI50-2 | 50 | 1508.4 ± 0.01 | 0.697 | 0.745 | −9.15 | BI50-3 | 50 | 1724.8 ± 0.01 | 0.797 | | | BI100-1 | 100 | 1325.9 ± 0.01 | 0.615 | | | BI100-2 | 100 | 1373.4 ± 0.01 | 0.640 | 0.623 | −24.02 | BI100-3 | 100 | 1318.4 ± 0.01 | 0.614 | | | BI200-1 | 200 | 1157.8 ± 0.01 | 0.539 | | | BI200-2 | 200 | 1218.4 ± 0.01 | 0.564 | 0.548 | −33.17 | BI200-3 | 200 | 1152.1 ± 0.01 | 0.541 | | | BI300-1 | 300 | 1046.5 ± 0.01 | 0.443 | | | BI300-2 | 300 | 1141.2 ± 0.01 | 0.480 | 0.452 | −44.88 | BI300-3 | 300 | 1026.3 ± 0.01 | 0.433 | | |
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