Numerical Simulation of Gas Ventilation Mode in Highway Gas Tunnel

Zhang, Jihua; Dong, Yiran; Chen, Yadong; Sun, Huasheng; Wu, Jingke; Wei-li, Liu; Chen, Jiarui; Pan, Suli

doi:10.1155/2021/5549168

Cited by 5 publications

(4 citation statements)

References 17 publications

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“…Zhang et al [7] studied the regularity of gas emission and diffusion at tunnel face during tunnel construction. Some scholars studied that comprehensive exploration should be conducted using geological mapping, gas monitoring, and other methods to analyze the source of gas and predict the gas in the unexcavated surrounding rock [8][9]. Liu et al [10] studied the influence of air duct layout on gas concentration in large section gas tunnel.…”

Section: Introductionmentioning

confidence: 99%

Research on Ventilation Simulation Technology for Large Section Gas Tunnel Construction

Liang Suo

2024

jes

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In order to solve the problem of gas overrun during the construction of large section gas tunnel, this paper takes the Baima Tunnel as the engineering background and uses fluent numerical simulation software to study the gas transport law of the tunnel under different ventilation methods. The results indicate that when the tunnel is excavated for 1200m, the forced ventilation method cannot effectively solve the problem of gas overrun on the heading face. After adopting the gallery ventilation method, the gas concentration on the heading face decreases to less than 1%, which effectively solved the problem of gas overrun on the heading face and provided assistance for the safe construction of the project..

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Section: Introductionmentioning

confidence: 99%

Research on Ventilation Simulation Technology for Large Section Gas Tunnel Construction

Liang Suo

2024

jes

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“…The pollutants seriously endanger the health of workers and the normal operation of equipment. These harmful gases are mainly CO, and the concentration must be reduced to below the safe concentration standard before proceeding with the next construction operation [1][2][3]. Ventilation is one of the most effective methods for removing harmful gases [4].…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Tunnel Ventilation Considering the Air Leakage Mechanism of a Ventilation Duct

Chang,

Chai,

Ren

et al. 2024

Applied Sciences

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Ventilation problems are critical in tunnel engineering, and the loss of air volume in ventilation ducts is generally estimated using empirical methods. The air volume calculation makes it difficult to meet the accuracy requirements, resulting in resource waste or insufficient air supply. In this study, the forced ventilation system of the tunnel under construction was investigated based on the computational fluid dynamics method. The mechanism of air leakage on airflow distribution and pollutant transport in the tunnel is determined. Air leakage reduces the distribution peak of pollutants and effectively accelerates the emission of harmful gases. However, this effect decreases with distance from the air duct inlet. Through the calculation results of nearly one hundred models, it is found that the air leakage of the duct can be fitted by logarithmic function and verified by empirical equation. The matching degree between the fitting function of the model and the empirical equation depends on the length of the tunnel. On this basis, the calculation formula of effective air volume near the working face is derived. This study can be applied to the ventilation engineering of the tunnel under construction and provide a theoretical basis for the calculation of the effective air supply.

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“…Zhang and Zhao [26] studied the fire characteristics of the gas tunnel under different ventilation modes through numerical simulations and analyzed the relationship between the distribution of temperature and smoke and the ventilation mode. Zhang et al [27] used simulation methods to simulate forced ventilation, free ventilation and mixed ventilation in gas tunnels, obtained the distribution laws of airflow velocity and gas concentration under these three ventilation modes and determined the ventilation system with the best effect.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Dynamic Exhaust Law for Ventilation System of Gas Tunnel

Zhang,

Lan

2023

Applied Sciences

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The ventilation system is the only channel for gas exchange inside and outside the gas tunnel, which determines whether the high-risk gas in the tunnel can be exhausted in time after a gas leakage accident; thus, it is essential to study the dynamic ventilation characteristics. A fire-retarding division of the gas tunnel in Songjiang District of Shanghai is taken as the study object, and, based on the similarity theory, a similarity experiment platform is built. The simulation experiments of exhaust are carried out under different exhaust velocities, ventilation equivalent diameters and initial gas concentrations by using the control variable method. The changes in ventilation duration and gas concentration are analyzed in detail. The conclusions are as follows: (1) Time–concentration curves at all positions in the gas tunnel exhibit an “asymptote” distribution. (2) Average gas concentration has a linear relationship with time at the beginning and becomes an exponential relationship after a certain time. (3) When the exhaust velocity is 5 m/s, the initial gas concentration is 15%VOL; when the equivalent diameter of the vent in the model is 0.2 m, the ventilation duration is 100.2 s. A calculation model of ventilation duration for the standard gas tunnel is established, and the application limits of the model are 1 ≤ v ≤ 5, 0.5 ≤ d ≤ 1.5, and 5 ≤ φo ≤ 25. (4) In practical engineering, an exhaust velocity of 5 m/s and an equivalent ventilation diameter of 1 m are relatively optimal ventilation parameters.

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Numerical Simulation of Gas Ventilation Mode in Highway Gas Tunnel

Cited by 5 publications

References 17 publications

Research on Ventilation Simulation Technology for Large Section Gas Tunnel Construction

Research on Ventilation Simulation Technology for Large Section Gas Tunnel Construction

Numerical Simulation of Tunnel Ventilation Considering the Air Leakage Mechanism of a Ventilation Duct

Experimental Study on Dynamic Exhaust Law for Ventilation System of Gas Tunnel

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