Abstract:Based on structural features in both transverse and longitudinal directions,a reasonable aseismic design method for structurally complicated subriver shield tunnels with large cross-section and deep underwater pressure is proposed. For the design of transverse direction of tunnel with relatively regular ground that is different from the hypothesis of boundary displacement sine wave distribution mode,practical seismic responses from the ground where the tunnel will be constructed have been calculated according to the theory of ground stratification reflection theory. Using seismic deformation method,the seismic response of a typical section of the tunnel was analyzed. The result was used in combination with static calculations as support for aseismic designs. For the longitudinal direction,the 3D time-domain response method should be used due to the requirement of considering linear structural features,the irregular ground along longitudinal direction of the tunnel,seismic traveling wave effects,and boundary effects,etc.. The features,applications,and analytical process of these two methods are discussed. The design method has been applied to a shield tunnel crossing the Yangtze River,and the seismic behaviors and the aseismic-weaker parts of this typical subriver shield tunnel are also indicated.