Dust pollution during shotcrete process in high-altitude tunnel based on numerical simulation
作者机构：College of Civil and Resource EngineeringUniversity of Science and Technology BeijingBeijing100083China NHC Key Laboratory for Engineering Control of Dust HazardUniversity of Science and Technology BeijingBeijing100083China
出 版 物：《Particuology》 (颗粒学报（英文版）)
年 卷 期：2023年第75卷第4期
页 面：82-95页
核心收录：
学科分类：07[理学] 070602[理学-大气物理学与大气环境] 0706[理学-大气科学]
基 金：the National Natural Science Foundation of China(grant No.51874016)
主 题：High-altitude tunnel Shotcrete Dust diffusion Numerical simulation Ventilation system
摘 要：The surrounding rock needs shotcrete support after drilling and blasting excavation in the tunnel;the high concentration of dust generated in the process will endanger workers occupational ***,to ensure the cleanness and safety of the tunnel construction process,a full-scale model of the tunnel was established based on field data of a high-altitude tunnel of the Sichuan-Tibet *** dust production mechanism is summarized by combing the whole process of *** Computa-tional Fluid Dynamics(CFD)method was used to study the diffusion and transport of dust under different *** grey relational analysis was applied to investigate the correlation values of the influ-encing factors on dust diffusion in the shotcrete operation *** results show that the dust gener-ation mechanism of shotcrete includes the sudden change of particle velocity in the jet area leading to escape and particle impact dust generation,where fine dust is easily dispersed in the *** continuous dust production,the dust concentration is higher near the wet spraying machine and on the backflow side of the working *** the air supply volume and shortening the distance between the air duct and the working face is conducive to diluting the dust concentration in the *** the high-altitude environment,the dust concentration in the tunnel decreases,the diffusion distance be-comes smaller,the settlement proportion of dust particles increases,and the risk of secondary pollution *** simulation results and the field measurement data are consistent,which can provide theoretical support for the construction site dust control.
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