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In order to study the deformation and failure mechanism of a high steep slope under underground excavation, the influence of different locations of tunnel excavation on slope stability was analyzed by using the finite element sliding surface stress method, and the failure mechanism and deformation characteristics of slope instability induced by underground excavation were systematically studied. The results show that the underground excavation destroys the original equilibrium system of the slope, redistributes the stress of the slope in the influence range of the excavation, and creates new tensile stress regions, compressive stress regions and shear stress regions in different areas of the slope, which causes adverse additional displacement on the surface and internal points of the slope, and thus has a significant impact on the stability of the slope. According to the position relationship between underground excavation holes and sliding surface, slope instability induced by underground excavation can be divided into four types, which are local slope collapse, slope A-type slip, slope B-type slip and slope C-type slip, and the failure process and mechanical mechanism of each type of instability are revealed.
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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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