Disaster effects of combustible gas explosion in an urban shallow-buried pipe trench (Ⅱ): influencing factor analysis and consequence evaluation

YANG Shigang; CAI Jiongwei; YANG Ya; SUN Wensheng; MEN Jingmin

doi:10.11883/bzycj-2021-0503

Volume 43 Issue 1

Jan. 2023

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YANG Shigang, CAI Jiongwei, YANG Ya, SUN Wensheng, MEN Jingmin. Disaster effects of combustible gas explosion in an urban shallow-buried pipe trench (Ⅱ): influencing factor analysis and consequence evaluation[J]. Explosion And Shock Waves, 2023, 43(1): 015401. doi: 10.11883/bzycj-2021-0503

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Disaster effects of combustible gas explosion in an urban shallow-buried pipe trench (Ⅱ): influencing factor analysis and consequence evaluation

doi: 10.11883/bzycj-2021-0503

1.
State Key Laboratory of Disaster Prevention and Mitigation of Explosion and Impact, Army Engineering University of PLA, Nanjing 210007, Jiangsu, China
2.
73021 Troop of PLA, Hangzhou 310012, Zhejiang, China

Received Date: 2021-12-08
Rev Recd Date: 2022-09-18

Available Online: 2022-12-11

Publish Date: 2023-01-05

Abstract

Abstract

Gas explosion accidents occurring in urban shallowly-buried pipe trenches can cause enormous casualties and property damage through shock waves transmitting from explosion vents, while many influencing factors exist in the process of gas explosion. In order to evaluate the disaster consequences of combustible gas explosion in an urban shallow-buried pipe trench systematically, the different conditions were established including different ignition points, different vent sizes, different gas cloud lengths and different trench cross-sectional areas. The computational fluid dynamics software FLACS was used to perform numerical simulation. And the explosion load of the combustible gas was obtained in the X, Y, and Z directions. The characteristics of the explosion overpressure peak distribution were analyzed, and the load generation mechanism was illustrated by analyzing the explosion process. The overpressure criteria were selected to demarcate the dangerous distances and the critical distances for damage to buildings and humans were determined. The mild, moderate, severe dangerous distances for building damage and personal injury were recorded and the influences of different factors on the change of the dangerous distances were analyzed. The results show that when the ignition position is closer to the middle of the pipe trench, the overpressure peak is greater and the dangerous distance is larger. The change of the vent sizes has a little effect on the fluctuation range of the dangerous distance, but has a great effect on the overpressure peak near the vent. The longer the gas cloud length, the greater the overpressure peak and the larger the dangerous distance, but the increase decreases gradually until it remains unchanged. The larger the cross-sectional area of the pipe trench, the greater the overpressure peak and the larger the dangerous distance. When the cross-sectional area of the pipe trench increases, the gas cloud volume participating in the combustion reaction in the pipe trench also increases, which intensifies the reaction degree of the gas explosion. In order to avoid serious disaster consequences, high-rise buildings and dense crowd should be far away from the explosion vent.
- urban shallow-buried pipe trench,
- gas explosion,
- explosion load,
- dangerous distance,
- overpressure peak,
- gas cloud length,
- consequence assessment

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References(19)

References

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