Seismic response of underwater tunnels based on the fluid-solid coupling dynamic model of fluid-saturated porous media

The seismic response of underwater tunnels in the saturated soil is studied by ABAQUS, with the site soil simulated by the pore pressure element deduced from fluid-solid coupling dynamic model of fluid-saturated porous media. Calculated results illustrate that to the single-hole tunnel in the saturated soil, the pore pressure of the soil near the bottom of tunnel is maximal by the end of the input earthquake wave. At that moment the value of the pore pressure of the soil located in two sides of tunnel is equal. On the other hand, to the double-hole tunnel in the saturated soil, the value of the pore pressure of the soil between two tunnels is positive, while the value of the pore pressure of the soil below the tunnels is negative. The value of the stress of two tunnels is equal. In the meanwhile, it is shown that the pore pressure element deduced from fluid-solid coupling dynamic model of fluid-saturated porous media is effective to the study of the seismic response of the underground structures in the saturated soil. ©, 2015, The Editorial Board of Journal of Basic Science and Engineering. All right reserved.