Research Article
Strength and Microscopic Damage Mechanism of Yellow Sandstone with Holes under Freezing and Thawing
Table 2
List of test samples for compressive strength and microscopic analysis.
| | Standard yellow sandstone | The hole diameter 6 mm | The hole diameter 8 mm | The hole diameter 10 mm | The hole diameter 12 mm | Compression strength (MPa) | Average value (MPa) | Compression strength (MPa) | Average value (MPa) | Compression strength (MPa) | Average value (MPa) | Compression strength (MPa) | Average value (MPa) | Compression strength (MPa) | Average value (MPa) |
| 0 times | 61.75 | 60.07 | 53.46 | 51.33 | 46.32 | 49.95 | 46.62 | 45.34 | 41.96 | 37.86 | 0 times | 60.20▲ | 51.13▲ | 48.62▲ | 46.19▲ | 36.38▲ | 0 times | 58.26 | 49.32 | 54.92 | 43.23 | 35.23 | 5 times | 56.22 | 54.89 | 50.23 | 48.60 | 49.82 | 47.48 | 45.07 | 43.20 | 40.72 | 37.59 | 5 times | 55.73▲ | 48.62▲ | 47.06▲ | 42.87▲ | 36.17▲ | 5 times | 52.73 | 46.96 | 45.56 | 41.65 | 35.88 | 10 times | 52.67 | 51.38 | 51.08 | 47.68 | 43.02 | 41.46 | 41.06 | 38.90 | 32.51 | 30.55 | 10 times | 50.89▲ | 46.62▲ | 41.16▲ | 39.37▲ | 31.12▲ | 10 times | 50.59 | 45.33 | 40.21 | 36.23 | 28.03 | 20 times | 51.54 | 48.07 | 46.26 | 44.88 | 41.55 | 39.26 | 32.58 | 31.03 | 29.23 | 27.07 | 20 times | 46.56▲ | 45.27▲ | 39.01▲ | 31.29▲ | 27.86▲ | 20 times | 46.12 | 43.12 | 37.23 | 29.23 | 24.13 | 40 times | 43.23 | 41.3 | 39.26 | 38.64 | 36.71 | 34.83 | 31.15 | 29.79 | 20.09 | 19.04 | 40 times | 42.35▲ | 39.03▲ | 34.03▲ | 30.01▲ | 20.03▲ | 40 times | 38.32 | 37.63 | 33.75 | 28.21 | 17.02 |
|
|
▲, samples selected for microscopic analysis.
|