Research Article
A Comparative Study on Fracture Characteristics of the Red Sandstone under Water and Nitrogen Gas Fracturing
Table 1
Tensile strength and fracture toughness of the red sandstone specimens.
| | Testing number | (mm) | (mm) | (mm) | (kN) | (kN) | (MPa) | (MPa·m1/2) |
| | 1 | 49.98 | 24.99 | 16.18 | 6.76 | 3.91 | 5.11 | 1.22 | | 2 | 49.92 | 24.96 | 17.70 | 6.34 | 3.20 | 4.39 | 0.91 | | 3 | 49.86 | 24.93 | 16.88 | 5.77 | 3.49 | 4.19 | 1.04 | | 4 | 50.01 | 25.05 | 15.94 | 5.62 | 2.53 | 4.30 | 0.80 |
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