DISCRIMINANT ANALYSIS OF TUNNEL FORMATION LIQUEFACTION BASED ON MODIFIED UBCSAND MODEL
In order to analyze whether liquefaction may occur in the geological survey report of the engineering proj-ect,and to evaluate the characteristics of liquefaction under seismic action,a nonlinear time history analysis method is adopted to establish a finite element calculation model based on the modified UBCSAND constitutive model.We analyze the pore pressure ratio time history curve and peak value of pore pressure ratio,vertical displacement time history curve,and corresponding peak value of the stratum where the tunnel is located under two working conditions including basic earthquake and rare earthquake.Based on liquefaction criteria,it can be determined that the stratum where the typical section of the tunnel is located will not undergo liquefaction.Finally,corresponding engineering preparatory measures for possible seismic liquefaction in tunnel engineering are proposed,providing the reference for similar engineering construction.