Numerical simulation on spatio-temporal distribution regularities of blasting dust mass concentration in open quarry

doi:10.16265/j.cnki.issn 1003-3033.2020.10.008

Abstract

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.

Key words: blasting dust, suction trough, vortex effect, mass concentration, spatio-temporal distribution, numerical simulation

CLC Number:

X932

ZHENG Xiazhong, YANG Qiu, JIN Lianghai, ZHENG Yuhang, LUO Han, MA Guofeng. Numerical simulation on spatio-temporal distribution regularities of blasting dust mass concentration in open quarry[J]. China Safety Science Journal, 2020, 30(10): 55-62.

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