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Outline
Weak interlayer is usually the main internal factor of rock slope instability, and rainfall is the main external factor of slope instability. For rock slope with weak interlayer, it is of great significance to study its instability mechanism and seepage characteristics to prevent slope instability. Taking the limestone open-pit slope with multiple weak interlayers in Nanshan, Chibi, Hubei Province as the research object, the instability characteristics of the slope were deeply explored by numerical simulation method, and the unsaturated seepage characteristics of the slope were studied based on the unsaturated seepage theory. Finally, the Morgenstern-price method was used to calculate the safety factor of each potential slip surface under the influence of seepage field. The results show that the weak interlayer is the main reason for the instability and failure of the slope, whether it is the overall instability and failure of the slope along the weak interlayer or the local instability and failure of the step. Under the influence of rainfall, the change of pore water pressure in the slope gradually develops from the surface to the depth, but the influence depth is limited. For the feature points with a certain distance from the slope surface, the increase of pore water pressure and volumetric water content has a “lag” phenomenon. The safety factor of each potential slip surface of the slope decreases, which decreases greatly in the early stage of rainfall, and tends to be stable in the later stage of rainfall.
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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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