The evolution mechanism of load-sharing
ratio of secondary lining under steel
arch frame corrosion of subsea tunnels is crucial for long-term safety of the tunnels. Herein, a three-dimensional
solid load-structure model of the primary support-secondary lining under corrosion effect of the steel arch frame is
established based on a subsea tunnel. The variation patters of the contact
stress between the primary support and secondary lining, the safety of the
secondary lining, and the load-sharing ratio under
different corrosion degrees of steel arch frame are examined. The results
indicate the following: (1) The contact stress between the primary support and
secondary lining sharply increases as the corrosion rate of steel arch frame
increases from 0% to 60%; the contact stress at the crown, arch shoulder,
sidewall, arch foot, and invert increases by 46%, 45.11%, 49%, 47.42%, and 44%,
respectively. The corresponding safety factor of the secondary lining shows a
downward trend. (2) The load-sharing ratio of the
secondary lining increases from 0.54 to 0.63, with an increase of 16.67%, as the corrosion rate of the steel
arch frame increases from 0% to 60%. (3) A prediction formula for the load-sharing ratio of the secondary lining is established by
comprehensively considering the corrosion rate of the steel arch frame, the
thickness of the secondary lining, and the elastic modulus of the secondary
lining.
ZHANG Yiteng
,
TIAN Siming
,
WANG Mingnian
,
MA Weibin
,
WANG Zhiwei
,
XU Tianyuan
,
ZHANG Jinlong
. Mechanical Evolution Mechanism of Secondary Lining
Under Steel Arch Corrosion[J]. Tunnel Construction, 2025
, 45(S1)
: 104
-112
.
DOI: 10.3973/j.issn.2096-4498.2025.S1.012
