Full
Outline
In view of the fact that Sijiaying Iron Mine does not have the condition of plane boundary expansion, it is necessary to set up the slope boundary pillar after the transition from open-pit to underground mining. The gravity increase method was adopted to study the stability of the slope boundary pillar after the transition from open-pit to underground mining. The evolution characteristics and laws of the stress field, displacement field and plastic zone of the slope boundary pillar under different gravity accelerations were obtained. The results show that under the condition of initial gravity acceleration of 1.0g, the 40 m thick slope boundary pillar can ensure the safety of underground mining and avoid instability of open-pit slope, such as collapse, caving and landslide. With the increase of gravity acceleration, the progressive instability failure of the slope boundary pillar can be divided into four stages: stable, slight deformation, serious deformation and instability failure. Slope boundary pillar is affected by the unloading of underground mining. The maximum principal stress is basically within 30 MPa, and the minimum principal stress and its distribution range increase greatly. The tensile stress value reaches more than 3 MPa, which is prone to tensile failure. The displacement field and plastic zone expansion characteristics of the slope boundary pillar are highly consistent with the tensile stress, expanding from the slope toe to the slope top on the west slope of the open pit. The research results have a certain guiding role in preventing and controlling slope instability after the transition from open-pit to underground mining.
78
12
| 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 |
关闭全屏
No. 86 Xueyuan South Road, Haidian District, Beijing
010-62662699(Operation and Technical Support)
qkjq@cast.org.cn
Copyright © 2025 China Association for Science and Technology. All rights reserved. For all open access content, the relevant licensing terms apply.
Sponsored by the Office of the Leading Group for Cybersecurity and Informatization of CAST, and supported by Science and Technology Review Publishing House
