In order to ensure the structural safety of the super-large-diameter submarine shield tunnel, a three-dimensional elastoplastic damage model of shield tunnel segments was developed based on the Jintang subsea tunnel project of the Yongzhou high-speed double line, considering the plastic damage of concrete and the three-dimensional discontinuous contact characteristics of segments. The ultimate bearing capacity and deformation characteristics of submarine shield tunnel under different lateral pressures K0 and water pressures pw were studied. The results show that: (1) With the increase of generalized load P, the stiffness of the segmental lining structure in working condition one gradually degrades. When the joint bolt yields (at P=580.5 kN), there is a significant reduction in the bearing capacity of the segmental lining, accompanied by extensive tensile damage occurring at the tunnel vault, the inner side of the arch bottom, and the outer side of the hance. (2) Under the ultimate bearing state (P=611.6 kN), the joint bolt yielded, although the longitudinal reinforcement did not yield; (3) A smaller lateral pressure coefficient (K0) results in a lower ultimate bearing capacity of the segment, an increased likelihood of tensile failure in the joint bolt, a faster rate of structural stiffness degradation, and a higher risk of segment failure due to bolt failure and the formation of plastic hinges at the segmental joints. (4) The mechanical response of the shield segment under external water pressure (pw) is opposite to that under the lateral pressure coefficient (K0). When pw≥1.08 MPa, the probability of structural failure in the shield tunnel increases as the bearing capacity of the segment section reaches its limit state. Based on the typical deformation and failure characteristics of segmental linings, the residual bearing capacity for the super-large-diameter shield tunnel was predicted using diameter convergence deformation as the index.
Li Hanyuan
,
Guo Hongyu
,
Feng Jin
,
Xie Xiongyao
,
Zhou Hongsheng
. Research on Structural Bearing Behavior and Safety Bearing State of Super-Lrge Diameter Shield Tunnel Segments[J]. Chinese Journal of Underground Space and Engineering, 2025
, 21(S2)
: 782
-793
.
DOI: 10.20174/j.JUSE.2025.S2.30
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