Based on the Jiaozhou Bay Second Subsea Tunnel
project, an antidislocation structure of the tunnel crossing the Cangkou fault
subject to a maximum dislocation of 0.49 m is designed. An optimal structure
design is proposed considering the serious weakening of the waterproof
performance induced by the failure of the tunnel lining. The characteristics of
deformation and stresses of the secondary lining′s large
crosssection scheme and the porous brittle buffer
material scheme are compared using the finite element method. Furthermore, the
excavation quantities and the construction difficulties are compared, and the
optimal design scheme of an antidislocation structure with flexible joints and
porous brittle material buffering is finally selected. In addition to reducing
the amount of excavation work and eliminating construction difficulty, the
optimal scheme addresses the issue of the secondary lining of the traditional
expanded excavation method, which is prone to devastating damage under the
action of fault dislocation. This ensures the normal functionality of the water
stop structure, and improves the safety of the subsea tunnel under active fault
dislocation.
WU Zheshu
,
SUN Wenhao
,
XIAO Mingqing
,
GUAN Honghao
,
CHEN Libao
. Antidislocation Structure Design of Jiaozhou Bay
Second Subsea Tunnel Crossing an Active Fault[J]. Tunnel Construction, 2023
, 43(5)
: 826
-836
.
DOI: 10.3973/j.issn.2096-4498.2023.05.010
