Numerical simulation study of gas leakage in underground utility tunnel
To study the leakage and diffusion of gas at the roof with different geometric structures in the underground utility tunnels,the numerical simulation models of gas leakage in utility tunnel with three types of roof structures,namely arch roof,pointy roof,and flat roof,were established by using Ansys Fluent software,and the diffusion law of gas in these utility tunnels with different structures was analyzed.The results show that the tunnel structure influences diffusion,with gas tending to accu-mulate at the top.Gas stratification is related to the tunnel structure,with the arched structure having:the most stable stratifi-cation.The tunnel structure also affects the diffusion speed of methane,with the lowest diffusion rate observed in the arched roof,thereby reducing the risk of explosion.The established tunnel diffusion prediction model has a maximum relative error of 4.57％,which can accurately predict gas leakage and diffusion.The research results can provide a certain reference for im-proving the safety of underground utility tunnels.
underground utility tunnelgas leakagenumerical simulationRichardson numberventilation frequency
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