Disaster effects of combustible gas explosion in an urban shallow-buried pipe trench (Ⅰ): shock wave propagation on the ground

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

doi:10.11883/bzycj-2021-0502

Volume 42 Issue 10

Oct. 2022

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WANG De-rong, GE Tao, ZHOU Ze-ping, WANG Ming-yang. Investigation of calculation method for anti-penetration of reactive power steel fiber concrete (RPC)[J]. Explosion And Shock Waves, 2006, 26(4): 367-372. doi: 10.11883/1001-1455(2006)04-0367-06

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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 (Ⅰ): shock wave propagation on the ground[J]. Explosion And Shock Waves, 2022, 42(10): 105101. doi: 10.11883/bzycj-2021-0502

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Disaster effects of combustible gas explosion in an urban shallow-buried pipe trench (Ⅰ): shock wave propagation on the ground

doi: 10.11883/bzycj-2021-0502

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: 2022-05-24

Available Online: 2022-07-04

Publish Date: 2022-10-31

Abstract

Abstract

The blast shock wave will be transmitted to the ground through the vent as a gas explosion accident occurs in an urban shallowly-buried pipe trench, and cause serious disaster consequences. However, there are few studies on the propagating law of the explosion load outward through the explosion vent in the long and straight space. Thus, it is necessary to reveal the explosion load distribution law on the ground of such accidents. Based on the combustible gas explosion test in the long and straight venting space conducted in the previous period, the applicability of parameters and grid size in FLACS software were verified. Then the FLACS software was used to carry out numerical simulations of the gas explosion process in the urban shallow buried pipe trench. The propagation process of shock wave was divided into three stages: stable stage, Δp₁ stage and Δp₂ stage, and the mechanism of shock wave was analyzed by fuel, flame, flow velocity and density. The results show that the value of Δp₁ is small, mainly caused by compression waves, and Δp₂ is the maximum overpressure peak, mainly caused by flame waves. The characteristics of the overpressure time-history curve were studied. The results show that Δp₁ has smaller differences in each direction than Δp₂, and the wave propagation has obvious directionality in X and Z directions, while symmetrical in the y direction. The attenuation law of shock waves in space was studied and the attenuation formula in each direction was obtained by data fitting. The results show that Δp₂ gradually decreases with the increase of the distance from the venting port, and the value of the value in each direction varies greatly, among which, it shows a symmetrical attenuation trend along the short side of the pipe trench section; Δp₂ and distance roughly satisfy the exponential function relationship, and the fitting degree is above 98.8%.
- urban shallow buried pipe trench,
- gas explosion,
- explosion shock wave,
- peak overpressure

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