Abstract
In the simplified procedure of Seed for liquefying evaluation of free fields, the coefficient rd is the essential parameter, but presently the liquefaction assessment of loess tunnels are not available using this method. In this study, the variation characteristics of rd, which is suitable for the liquefying assessment of loess tunnels, are studied by 3D numerical simulation and analysis. The results reveal: the soils nearby underground structure have higher liquefaction potential than soils far it; the rd increases rapidly as nearing the tunnel excavation contour for distances smaller than the tunnel excavation span B; the formula of rd reveals the tunnels with shallower buried depth are more prone to liquefying than tunnels with larger burial depth h, and it can be used to estimate the liquefaction of loess tunnel; the pore pressure ratio Ru has the similar rule with the coefficient rd.
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