The authors present a case
analysis of diseases in an operational immersed tunnel. Field investigations
are conducted to assess the tunnel′s
condition, and the causes of tunnel diseases are examined using diagnostic
methods. Based on the findings, treatment measures are proposed to ensure the
tunnel′s safe operation. The primary interventions
include foundation treatment and shear key repair. For foundation treatment,
the horizontal directional grouting and floor grouting methods are compared and
analyzed. The shear keys are reinforced through different repair approaches,
including the reinforcement of W-steel plates on the
sidewall, the repair of shear key steel adhesion, and the addition of a shear
frame in the middle corridor. The results indicate the following: (1) The
operational immersed tunnel exhibits foundation cushion voids, pavement cracks,
and shear key damage, primarily caused by uneven settlement between tunnel
joints. This settlement is closely linked to factors such as river siltation,
erosion, and foundation cushion loosening during operation. (2) The floor
grouting method is more convenient, has minimal environmental impact, and
effectively controls uneven settlement at a lower cost. (3) The W-steel plate reinforcement method significantly improves the shear
strength of the middle partition wall′s concrete shear
bond and is relatively simple to implement. Based on these findings, W-steel plate reinforcement and floor grouting are recommended for
this case.
SUN Chao
,
ZHANG Guangwei
,
DA Wuqiang
,
YU Zufeng
. Analysis of Diseases and
Treatment Measures for an Immersed Tunnel[J]. Tunnel Construction, 2025
, 45(2)
: 415
-424
.
DOI: 10.3973/j.issn.2096-4498.2025.02.017
