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

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...

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Published inApplied sciences Vol. 14; no. 6; p. 2372
Main Authors Du, Jiaqi, Chen, Jian, Zhu, Lingqi, Guo, Liwen, Wang, Fusheng, Hu, Xiangming
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.03.2024
Subjects
Accuracy
Algorithms
CESE solver
Chemical reactions
Coal industry
Coal mining
Comparative analysis
Computer industry
Explosions
Methane
methane deflagration
Mine accidents
Mines
Numerical analysis
Propagation
shock wave overpressure
Shock waves
Simulation
Simulation methods
structural response
tunnel with uneven walls
Tunnels
United States
China
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Summary: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.
ISSN:2076-3417
2076-3417
DOI:10.3390/app14062372