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High-precision Discrete Simulation Method of Floating Dusts Based on Two-stage Solution and Its Application
(1. Anyang Institute of Technology, Anyang 455099; 2. Henan International Joint Laboratory of Man, Machine, Environment and Emergency Management, Anyang 455099; 3. Institute of Traffic Safety Technology of Southwest Jiaotong University, Chengdu 610031;4. Sichuan Highway Planning, Survey, Design and Research Institute Ltd., Chengdu 610041; 5. Zhongjian Hoton Construction Group Co., Ltd., Chengdu 610091)
Abstract To solve the dynamic simulation of the space-time evolution characteristics of floating dusts in a tunnel after the blasting, this study introduces a numerical approximation model to fit the initial emission of floating dusts.On this basis, the study proposes a two-stage discrete numerical simulation method to solve the problem of subjective assignment and accurate solution according to the actual working conditions of the tunnel. Taking a tunnel under construction in Guizhou as the background, the study calculates in a two-stage solution the dynamic space-time concentration field of floating dusts by using the discrete mode of finite element Ansys-Fluent software. In the first stage, the dispersion of floating dusts on the concentration gradient under the condition of static wind is simulated,and in the second stage the diffusion of floating dusts with the flow under the condition of mechanical ventilation is simulated. The results show that the maximum error between the simulated data and measured data at sampling points along the range within the ventilation test cycle is 13.67%, and the figure at random sampling points is 12.39%. Also, the study uses the two-stage simulation solution to dynamically simulate the floating dusts in two other tunnels under construction with air duct vault layout and bench method excavation, and the error at random sampling points is all controlled within 11%. The relevant data show that the two-stage simulation solution method is largely applicable and can effectively guarantee a low error in the simulation data under different cases, and the method can be used as a new high-precision simulation application method for the dynamic evolution of floating dusts after tunnel face blasting.
Abstract：
To solve the dynamic simulation of the space-time evolution characteristics of floating dusts in a tunnel after the blasting, this study introduces a numerical approximation model to fit the initial emission of floating dusts.On this basis, the study proposes a two-stage discrete numerical simulation method to solve the problem of subjective assignment and accurate solution according to the actual working conditions of the tunnel. Taking a tunnel under construction in Guizhou as the background, the study calculates in a two-stage solution the dynamic space-time concentration field of floating dusts by using the discrete mode of finite element Ansys-Fluent software. In the first stage, the dispersion of floating dusts on the concentration gradient under the condition of static wind is simulated,and in the second stage the diffusion of floating dusts with the flow under the condition of mechanical ventilation is simulated. The results show that the maximum error between the simulated data and measured data at sampling points along the range within the ventilation test cycle is 13.67%, and the figure at random sampling points is 12.39%. Also, the study uses the two-stage simulation solution to dynamically simulate the floating dusts in two other tunnels under construction with air duct vault layout and bench method excavation, and the error at random sampling points is all controlled within 11%. The relevant data show that the two-stage simulation solution method is largely applicable and can effectively guarantee a low error in the simulation data under different cases, and the method can be used as a new high-precision simulation application method for the dynamic evolution of floating dusts after tunnel face blasting.
SANG Conghui1,
2 QIAO Liwei1,
2 WANG Lieni3 YUAN Wenchao4 ZHAO Yanfa5
.High-precision Discrete Simulation Method of Floating Dusts Based on Two-stage Solution and Its Application[J] MODERN TUNNELLING TECHNOLOGY, 2023,V60(2): 203-211
2023, Vol. 60 