@Article{sdhm.2026.077643,
AUTHOR = {Pengcheng Kang, Yuanyuan Tian, Ying Liu, Qian Xu, Yuting Chen, Lixin Jia, Shuge Guo, Heng Rong, Taolong Xu},
TITLE = {Numerical Investigation on the One-Way Coupling of Gas Leakage-Explosion and a New Quantitative Overpressure Attenuation Law in Underground Culverts},
JOURNAL = {Structural Durability \& Health Monitoring},
VOLUME = {},
YEAR = {},
NUMBER = {},
PAGES = {{pages}},
URL = {http://www.techscience.com/sdhm/online/detail/26685},
ISSN = {1930-2991},
ABSTRACT = {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.},
DOI = {10.32604/sdhm.2026.077643}
}