Full
Outline
To solve the problem of stress-structural failure that may be caused by the excavation of the right tunnel section of deep crushing station, the geological conditions of the tunnel face and the attitude information of the rock mass were collected by UAV, and the three-dimensional rock mass structure numerical calculation model of the right tunnel section of deep crushing station was constructed by combining the display discrete element numerical simulation software 3DEC. The deformation characteristics, failure mechanism and loss mode of deep rock mass under high stress conditions were explored, and the prevention measures were put forward. The results show that the stability of the surrounding rock of the tunnel section is controlled by the contact area of the red-brown granite stratum and the gray-black gray gneiss stratum and the in-situ stress field. The reason for the stress-structural failure of the tunnel section is that the excavation unloading of the crushing station leads to the formation of unfavorable blocks in the JSet #2 and JSet #3 joint groups and the excavation surface. Therefore, for the tunnel section with developed joints, the stress-structural failure disaster is a problem that needs special attention for the stability of surrounding rock after the excavation of the crushing station. It is suggested that the method of “optimizing excavation parameters + combined support form” should be adopted to systematically control the stress-structural damage after excavation unloading of crushing station from three levels of surface, shallow and deep layers.
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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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