Foundation seismic response analysis and liquefaction possibility evaluation of tunnel crossing Yellow River

We reveal the large variation of spatial distribution of soil layers and soil parameters of the tunnel crossing Yellow River of South-to-North Water Diversion Project,which are likely to result in uneven displacement when an earthquake happens,and therefore induce destruction of the tunnel.In view of the tunnel foundation and based on viscoelastic plasticity dynamic constitutive model of soil,we propose a 3-D effective stress dynamic analysis method for geotechnical seismic analysis and an anti-seismic safety evaluation method with consideration of the dissipation and diffusion process of pore water pressure.Using the soil dynamic parameters,we conduct a seismic analysis of the tunnel foundation to obtain its acceleration response and stress response,and conduct an evaluation on liquefaction possibility of the foundation.The research results can provide a theoretic support for seismic design of the tunnel crossing Yellow River.