Citation

Zheng X, Yang Q, Jin L, Zheng Y, Luo H, Ma G. China Saf. Sci. J. 2020; 30(10): 55-62.

Copyright

(Copyright © 2020, China Occupational Safety and Health Association, Publisher Gai Xue bao)

DOI

10.16265/j.cnki.issn1003-3033.2020.10.008

PMID

unavailable

Abstract

In order to explore influencing factors and spatio-temporal distribution law of blasting dust diffusion in open quarry, with Yangfanggou Jinbo quarry as research background, physical and chemical factors of blasting dust diffusion and local wind factors were analyzed considering spatial deployment characteristics of bench excavation. Then, spatio-temporal distribution regularities of blasting dust mass concentration was numerically simulated by using fluid mechanics finite element method. Finally, simulation results were visualized and analyzed. The results show that an air flow vortex generates at bottom of open quarry due to impacts of excavation space deployment, and vortex effect of suction trough is significant in diffusion process of blasting dust. Within 5-20 s after blasting, dust forms a distribution belt of high concentration of 1.2×10-3kg/m3-2×10-3kg/m3. Within 20-100 s, the belt gradually disappears, and dust concentration tends to be high in north and low in south. And when it comes to 100-800 s, dust particles reduce bit by bit, and spatial distribution law is relatively stable. It is suggested that spray equipment for dust reduction should be arranged in high concentration distribution belt formed by vortex effect and north side of open quarry with spray angle for the latter being relatively larger. © 2020 China Safety Science Journal. All rights reserved.

Language: zh