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Fissure distribution has a significant effect on mechanical properties and damage failure of layered rock mass with complex fissures. Based on the uniaxial compression test and DIC technique, the influence of fissure location and fissure angle on the mechanical properties and failure of the composite fissure rock sample composed of sandstone-like and martial-like rocks was analyzed. The results show that the mechanical properties of composite fissure rock samples increase with the change of fissure location from sandstone, interface and marble and the increase of fissure angle. Influence of fissure location on rock sample failure: When the fissure is in marble, the initial crack is easy to be the far-field crack in sandstone, and the surface spalling occurs in both sandstone and marble, but the failure is more obvious in sandstone, is prone to "H-shaped failure". When the fissure is at the interface and sandstone, it is easy to produce wing crack and anti-wing crack at the crack tip of sandstone. Exfoliation occurs only in sandstone, "1γ shape failure" and "y shape failure" are easy to occur, respectively. At the same time, the stress-strain levels σ and ε corresponding to the initial crack generation at the same fissure angle increase with the change of fissure position from sandstone, sandstone to marble and marble. Influence of fissure angle on rock sample failure: When α=90°, the tip is not easy to crack, and when α=45°, the tip is easy to crack. When the fissure location is the same, the σ and ε of α=90° are the largest, while the σ and ε of α=0° and α=45°are the smallest. "H-shaped failure" occurs when α=0° and "y-shaped failure" occurs when α=90°. The research results are instructive for practical engineering construction and design.
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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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