Full
Outline
With a domestic super-large iron mine taken as research background, FLAC3D was adopted to calculate and analyze the rock movement law by mining and backfilling operations of underground super-large area, and the deformation degrees of the ground surface and shafts were also evaluated according to relevant standards. It is found that the hanging wall and foot wall in the mining disturbed zone are concentrated within rock movement zones. The peak displacements of subsidence and uplift are approximately 9 cm and 6 cm respectively, which decrease gradually in an arch-shaped pattern toward the ground surface or deep footwall strata. Meanwhile, deep mining activities tend to aggravate the deformation of rock masses in middle sections. The maximum absolute values of surface inclination, curvature and horizontal deformation are 0.22 mm/m, 0.002×10-3/m and 0.12 mm/m, respectively, all less than the maximum allowable deformation values specified in relevant standards. It indicates that deep mining is unlikely to induce tilting deformation of surface buildings (structures), whereas the southern and northern service shafts are located within the movement zones. Further shaft stability analysis reveals that the southern and northern service shafts are subjected to mining disturbances, and the peak values of inclination, curvature and horizontal deformation of shaft wall are 0.52 mm/m, 0.09 × 10-3/m and 0.18 mm/m respectively, which are also within the permissible limits according to relevant standards. The maximum cumulative subsidence over time at each monitoring point of the main and auxiliary shafts to the surface is less than 4.6 mm, which indicates that the underground mining of super-large area exerts slight influences on the stability of the main and auxiliary shafts, as well as other buildings (structures).
137
24
| 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
