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Outline
To improve the efficiency of structural plane investigation and the accuracy of failure mode identification for open-pit slopes, the open-pit slope of Nannihu Molybdenum Mine in Henan Province was taken for research. The open-pit slopes were divided into 6 sub-areas, and a joint and fissure investigation method based on point cloud recognition was adopted to obtain the occurrence data of rock mass structural planes in each sub-area, and the recognition accuracy was verified by comparing with the manual scanline measurements. Cluster analysis was performed for the recognized structural plane data to divide the dominant structural plane sets in each sub-area. The spatial combination relationship between the dominant structural planes and the slope was analyzed by adopting stereographic projection to determine the potential failure modes of each sub-area. The results show that the occurrence data of the structural plane obtained by point cloud recognition are in good agreement with the manual measurements, which can meet the requirements of slope structural plane investigation and analysis. A total of 14 sets of dominant structural planes were identified in the six sub-areas: two sets of dominant structural planes were developed in each of zones Ⅰ, Ⅱ, Ⅴ and Ⅵ, while three sets of dominant structural planes were developed in each of zones Ⅲ and Ⅳ. Based on stereographic projection analysis, there are certain differences in the potential failure modes of slopes in different sub-areas, mainly in planar sliding and wedge failure modes. It is found that a single failure mode occurs in some part of sub-areas, and a combination of two failure modes occur in others.
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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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