TY  - EJOU
AU  - Kang, Pengcheng 
AU  - Tian, Yuanyuan 
AU  - Liu, Ying 
AU  - Xu, Qian 
AU  - Chen, Yuting 
AU  - Jia, Lixin 
AU  - Guo, Shuge 
AU  - Rong, Heng 
AU  - Xu, Taolong 

TI  - Numerical Investigation on the One-Way Coupling of Gas Leakage-Explosion and a New Quantitative Overpressure Attenuation Law in Underground Culverts
T2  - Structural Durability \& Health Monitoring

PY  - 
VL  - 
IS  - 
SN  - 1930-2991

AB  - Accurate assessment of gas explosion risks in urban underground culverts is often hindered by the decoupling of leakage diffusion and explosion mechanics. This study develops a high-fidelity numerical framework by implementing a one-way coupling strategy, where the steady-state methane concentration field simulated in FLUENT is mapped into ANSYS/LS-DYNA as the initial material status. Unlike traditional models assuming uniform gas distribution, this approach captures the realistic impact of complex culvert geometries on explosion precursors. <i>A</i> multi-material coupled model involving the confined space, road surface, and surrounding air was established to investigate shock-wave propagation and structural response. The results reveal the migration laws of explosive regions in both enclosed and semi-enclosed spaces. The primary contribution is the derivation of a novel quantitative overpressure attenuation law <i>P</i> = <i>A</i>·<i>e</i><sup><i>Bx</i></sup> that explicitly incorporates the depth-to-width ratio, <i>r</i>. This formula enables the precise determination of damage radii for building structures and personnel. Validation against experimental benchmarks confirms the model’s reliability. The proposed framework and empirical formula provide a robust tool for urban safety distance planning and emergency risk zoning.
KW  - Confined space; gas cloud explosion; one-way coupling; overpressure attenuation law; depth-to-width ratio; damage assessment

DO  - 10.32604/sdhm.2026.077643