Influence of length and angle of bifurcated tunnel on shock wave propagation

Zhang, Xuebo; Shen, Shuai-Shuai; Yang, Ming; Wang, Hao; Ren, J.; Lu, Fang-chao

doi:10.1016/j.jlp.2022.104802

Cited by 6 publications

(2 citation statements)

References 10 publications

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“…The gas explosion is a non-stationary process with no slip on the model walls. The iterative solution is performed using Simple algorithm with an iteration step of 0.0005 s. This mathematical model has been demonstrated in the literature to simulate the gas explosion shock wave propagation process [23][24][25].Zhang et al [26]also used this mathematical model to verify the experimental results of the blast propagation experiments carried out in the experimental system shown in Figure 2 by numerical simulation, which also verified the reliability of this model.…”

Section: Mathematical Modelmentioning

confidence: 76%

Numerical analysis of the effect of ventilation door on the propagation characteristics of gas explosion shock waves

Zhang

Han

Ren

et al. 2023

Preprint

Self Cite

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Ventilation door are commonly found in tunnels and other underground engineering ventilation structures, disaster periods using its explosion isolation, explosion relief, wind regulation characteristics for disaster prevention and mitigation is of great significance.This paper numerically simulates the propagation characteristics of the gas explosion shock wave in the nearby tunnel when the ventilation door are opened at different degrees, and analyzes the influence mechanism of the opening degree on the change law of the shock wave overpressure distribution in the nearby tunnel.The results show that the shock wave forms a strong turbulence area (high pressure area) on both sides in front of the ventilation door, and the area range and the overpressure value decrease with the increase of the opening degree; the ventilation door reduce the intensity of the shock wave, so that the overpressure behind the ventilation door decreases, and the smaller the opening degree, the lower the overpressure behind the ventilation door.The secondary explosion formed shock wave and the ventilation door reflected shock wave meet to form a stronger shock wave, which leads to different opening degrees of ventilation door, its before, after the roadway and after the bifurcation of the main roadway in the measured points of the overpressure change curve is different, the main difference is that the peak overpressure for the first wave or the second wave peak. The peak overpressure in the tunnel before and after the ventilation door decreases and increases respectively with the increase of the opening length, and the overall decay of the peak overpressure at 5m and 10m before the ventilation door is 49.56% and 4.04% respectively and only has an effect on the peak overpressure in main tunnel within 20m from the bifurcation.

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Section: Mathematical Modelmentioning

confidence: 76%

Numerical analysis of the effect of ventilation door on the propagation characteristics of gas explosion shock waves

Zhang

Han

Ren

et al. 2023

Preprint

Self Cite

View full text Add to dashboard Cite

show abstract

“…The effects of methane volume concentration, blockage rate, tunnel length, and cross-sectional area on gas explosion overpressure were studied. Zhang et al [9] studied the variation in shock wave overpressure in the main tunnel under bifurcated tunnels with different lengths and angles using the CFD program. Gao et al [10] established a numerical model of gas explosion using OpenFOAM open-source CFD code based on the spatial structure characteristics of goaf.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study on the Dynamic Response of Gas Explosion in Uneven Coal Mine Tunnels Using CESE Reaction Dynamics Model

Du,

Chen,

Zhu

et al. 2024

Applied Sciences

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A numerical simulation method combining the detailed chemical reaction mechanism of methane deflagration with an approximate real tunnel structure was proposed to confirm whether the unevenness of the tunnel wall during a coal mine gas explosion can be ignored. The approximate real tunnel model and smooth wall tunnel model were developed using 3D modeling methods. The propagation and attenuation processes of shock waves in the two tunnel models, as well as the different dynamic responses of the two tunnel walls, were compared and analyzed. Research results show that the non-uniformity of the tunnel wall decreases the shock wave overpressure and propagation velocity. The peak overpressure reduction value of the shock wave reaches 81.91 kPa, and the shock wave overpressure reaches its peak at an extended maximum time of 7.4 ms. The stress distribution on the approximate real tunnel wall is discontinuous, the propagation speed of stress waves in the bend tunnel is slower, and the duration of high load is relatively low. The displacement of the approximate real tunnel after gas explosion is lower than that of tunnels with smooth walls, and the displacement of most measuring points on the tunnel on the right is only 1/3–1/2 that of the smooth tunnel.

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Numerical analysis of the effect of ventilation door on the propagation characteristics of gas explosion shock waves

Zhang,

Han,

Ren

et al. 2023

Geomech. Geophys. Geo-energ. Geo-resour.

View full text Add to dashboard Cite

Ventilation door are commonly found in tunnels and other underground engineering ventilation structures, disaster periods using its explosion isolation, explosion relief, wind regulation characteristics for disaster prevention and mitigation is of great significance. This paper numerically simulates the propagation characteristics of the gas explosion shock wave in the nearby tunnel when the ventilation door are opened at different degrees, and analyzes the influence mechanism of the opening degree on the change law of the shock wave overpressure distribution in the nearby tunnel. The results show that the shock wave forms a strong turbulence area (high pressure area) on both sides in front of the ventilation door, and the area range and the overpressure value decrease with the increase of the opening degree; the ventilation door reduce the intensity of the shock wave, so that the overpressure behind the ventilation door decreases, and the smaller the opening degree, the lower the overpressure behind the ventilation door. The secondary explosion formed shock wave and the ventilation door reflected shock wave meet to form a stronger shock wave, which leads to different opening degrees of ventilation door, its before, after the roadway and after the bifurcation of the main roadway in the measured points of the overpressure change curve is different, the main difference is that the peak overpressure for the first wave or the second wave peak. The peak overpressure in the tunnel before and after the ventilation door decreases and increases respectively with the increase of the opening length, and the overall decay of the peak overpressure at 5 m and 10 m before the ventilation door is 49.56% and 4.04% respectively and only has an effect on the peak overpressure in main tunnel within 20 m from the bifurcation.

show abstract

Influence of length and angle of bifurcated tunnel on shock wave propagation

Cited by 6 publications

References 10 publications

Numerical analysis of the effect of ventilation door on the propagation characteristics of gas explosion shock waves

Numerical analysis of the effect of ventilation door on the propagation characteristics of gas explosion shock waves

Numerical Study on the Dynamic Response of Gas Explosion in Uneven Coal Mine Tunnels Using CESE Reaction Dynamics Model

Numerical analysis of the effect of ventilation door on the propagation characteristics of gas explosion shock waves

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