In this study, a case study is conducted on the
Shantou Bay tunnel and a finite element model of a seawaterseabedtunnel system is established using the ABAQUS software to
investigate the seismic response and damage of subsea tunnels under various
seismic excitations and seawater depths. The results are summarized as follows:
(1) Considering vertical SV waves only, the stress is mainly concentrated at
the arch foot and shoulder and the seawater depth exerts a minimum effect on
the horizontal motion of the seabed site and the subsea tunnel. (2) Considering
vertical P waves only, the overlying seawater inhibits the vertical motion of
the seabed site with increasing seawater depth and the stress below the arch
waist of the tunnel increases considerably. (3) Considering the delayed
incidence of PSV waves, the fracture energy and damage
of the tunnel exert a certain superposition effect and the stress concentration
at the arch foot and arch shoulder of the tunnel is obvious. When the depth of
seawater is less than 20 m, the fracture energy and damage of the tunnel are
small and the SV wave is dominant; furthermore, when the depth of seawater is
greater than 20 m, the fracture energy and damage of the tunnel increase
considerably and the P wave is dominant. Therefore, it is essential to consider
the adverse effect of seawater on the seismic safety of the tunnel.
HUANG Weizhen
,
XU Guoyuan
,
HE Cong
,
LI Baijian
. Seismic Response Analysis of Subsea Tunnels
Considering FluidSolid Coupling Effect[J]. Tunnel Construction, 2024
, 44(4)
: 739
-749
.
DOI: 10.3973/j.issn.2096-4498.2024.04.012
