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The structural plane of rock mass plays a key role in geological engineering, and its shear behavior has an important influence on the stability of rock mass and engineering safety. In order to deeply understand the shear behavior characteristics of rock mass structural plane, PFC2D was used to analyze the mechanical behavior of regular structural plane, asymmetric structural plane and irregular structural plane with different roughness under different normal stress conditions. The results show that the shear failure modes of the specimens can be divided into four types: the structural plane sliding along the sawtooth surface, the structural plane slides along the sawtooth surface and the sawtooth tip is cut off, the failure surface penetrates from the sawtooth bottom to the other side of the sawtooth, and the sawtooth bottom is completely cut off. With the increase of normal stress and undulating angle, the failure mode gradually changes from the structural plane sliding along the edge of the sawtooth force side to the sliding along the whole serrated surface, and finally evolves into the complete shear of the sawtooth bottom. The shear strength of the structural plane increases approximately linearly with the increase of normal stress and undulating angle. In the initial stage, the shear stress of the irregular structural plane increases approximately linearly with the increase of the shear displacement, and the normal stress has almost no correlation with the joint roughness.
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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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