Full
Outline
To investigate the mechanical properties and energy evolution laws of fractured sandstone under water-bearing conditions, uniaxial compression tests were conducted using a microcomputer-controlled coal-rock rigid impact testing system on sandstone specimens collected from a mine in Ordos. The tests considered both natural and saturated states, as well as different fracture inclination angles (0°, 30°, 60°, 90°). The full stress-strain curves, physical and mechanical parameters, energy evolution laws, and crack propagation behavior of fractured sandstone were analyzed. The results show that compared with intact sandstone, the peak strength and elastic modulus of sandstone with pre-existing fractures are significantly reduced. The total energy absorbed by the specimens under natural states (196-317 kJ/m3) is approximately 1.85 times that under saturated states (102-176 kJ/m3), and the total energy increases as the fracture inclination angle increases. Regarding energy evolution, the proportion of elastic strain energy exceeds 92% during the stable damage stage, while it drops to below 61.5% during the accelerated damage stage, with the proportion of dissipated energy which shows the opposite trend. The failure mode of the specimens exhibits significant anisotropy, and the deterioration effect of water reduces the initiation stress by 13.43% to 18.18%, while also increasing the occurrence of rock spalling. Fracture inclination angle and water-bearing state are key factors controlling the mechanical properties, energy evolution, and failure mode of sandstone. The research findings can provide a theoretical basis for the stability control of water-rich fractured rock mass engineering.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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