Abstract:To study the dynamic response of running tunnels in liquefiable site, the dynamic responses of tunnel structures under uniform excitation, local liquefaction, and traveling wave excitation were analyzed by the FLAC3D software. The calculation results showed that the liquefaction of foundation soil affects the stress state of tunnel lining, and the failure position of lining changes from the arch shoulder and arch foot in non-liquefied site to the invert arch and arch waist in liquefied site. Compared with the liquefaction site, when the tunnel passes through local liquefiable soil, the failure position extends to the whole section of lining. Compared with the uniform excitation, under traveling wave excitation, the principal stress of lining increases, the distribution of principal stress changes, and the torsion effect bears.