Full
Outline
In order to reasonably determine the thickness of the Quaternary water-resistant roof pillar and the width of water-resistant pillar in the fault of an iron mine in Luanzhou, taking a mine using typical filling mining method in Luanzhou as the engineering background, through theoretical analysis, based on the size optimization of the mine water-resistant pillar, the stability of the optimized size was evaluated by the large-scale finite element numerical calculation model. The results show that after the excavation and filling of the designed ore body, the influence area height under the maximum displacement does not intrude the Quaternary lower weathered rock strata. The maximum and minimum principal stresses are compressive stress, and there is no tensile stress area, which does not exceed the compressive strength of surrounding rocks and is close to the compressive strength of weathered rock strata. Weathered rock does not produce plastic zone failure unit. The sensitive area of the overall displacement of the fault and the pillar is distributed in the range of 0−30 m. The maximum and minimum principal stresses of fault and pillar are compressive stress, and no tensile stress occurs. The compressive stress in the contact area between the fault and the surrounding rock reaches the plastic strength, and the principal stress in the pillar area does not exceed the strength of the pillar. The contact area between the fault and the pillar, the contact area between the fault and the surrounding rock locally produces plastic zone, and the penetrating area is not formed. The ore body above −110 m level is set as the roof pillar to meet the safety requirements of water-resistant mining in weathered rock strata. A 100 m water-resistant pillar is left on the north side of the fault and a 60 m water-resistant pillar is left on the south side to meet the safety requirements of water-resistant mining. The research results can provide a reference for the design and evaluation of water-resistant pillar in the process of underground mining in similar mines.
36
18
| 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
