Full
Outline
In order to reduce the adverse effects of loading dust on the occupational health of workers in low-concave open-pit mines and formulate effective dust reduction measures, based on the theory of gas-solid two-phase flow, the Euler-Lagrange model and Fluent numerical simulation software were used to explore the influence of different wind speeds on the diffusion and mass concentration distribution of loading dust near the side slope of low-concave open-pit mines. The results show that the flow separation occurs after the airflow passes through the steps, forming a low-speed turbulent zone, a counterclockwise structural vortex and a clockwise small vortex in the carriage, which makes the flow field structure near the －12 m horizontal mining working face and the carriage of the open-pit mines very complicated. With the increase of wind speed, the aggregation time of loading dust in the carriage is shortened, the diffusion rate of loading dust is increased, the distance of diffusion pollution effect along the X-axis is increased, and the maximum dust mass concentration aggregated in the structural vortex is significantly reduced. The dust mass concentration in the carriage is higher than 100 mg/m3, and the dust mass concentration at the height of the respiratory zone decreases along the way, and the decrease of dust mass concentration is reduced. According to the numerical simulation results and the occupational exposure limit of 8 mg/m3, the area of the dust pollution is determined to be within 15 m in front of the front of the car. Measures are formulated such as using fog gun trucks, sprinkler trucks and equipping protective equipment, and good dust removal effect is obtained.
71
26
| 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
