Abstract The purpose of this paper is to investigate the bending strength of shield tunnel segment joints after bolt failure or when bolts cannot be installed under special conditions. Based on the Jinan Yellow River Tunnel, a threedimensional refined numerical calculation model for large diameter shield tunnel segment joints with/without bolts is established based on ABAQUS, to analyze the opening angle of joint surface, bending stiffness of segment joint,the variation of bolt stress with the internal force of the joint and the law of joint compression damage when the segment joint is subjected to positive bending moment and negative moment with/without bolted connection. The results indicate that: (1) The influence of bolt failure on the opening angle of the joint is mainly reflected in the latter half of the joint stress state, and the greater the axial force on the joint, the weaker the influence of bolts on the opening angle of the joint. (2) The bending stiffness of the joint is smaller without bolted connection, and the decrease in the bending stiffness of the joint under the negative bending moment is smaller than that under the positive bending mo? ment. (3) The bending moment at which the bolt yields under the negative bending moment is greater than the yielding bending moment under the positive bending moment; and the greater the axial force on the joint, the greater the corresponding bending moment value when the bolt yields. (4) Under the high axial load, the compression damage of shield tunnel segments is almost unaffected by bolts.
Abstract：
The purpose of this paper is to investigate the bending strength of shield tunnel segment joints after bolt failure or when bolts cannot be installed under special conditions. Based on the Jinan Yellow River Tunnel, a threedimensional refined numerical calculation model for large diameter shield tunnel segment joints with/without bolts is established based on ABAQUS, to analyze the opening angle of joint surface, bending stiffness of segment joint,the variation of bolt stress with the internal force of the joint and the law of joint compression damage when the segment joint is subjected to positive bending moment and negative moment with/without bolted connection. The results indicate that: (1) The influence of bolt failure on the opening angle of the joint is mainly reflected in the latter half of the joint stress state, and the greater the axial force on the joint, the weaker the influence of bolts on the opening angle of the joint. (2) The bending stiffness of the joint is smaller without bolted connection, and the decrease in the bending stiffness of the joint under the negative bending moment is smaller than that under the positive bending mo? ment. (3) The bending moment at which the bolt yields under the negative bending moment is greater than the yielding bending moment under the positive bending moment; and the greater the axial force on the joint, the greater the corresponding bending moment value when the bolt yields. (4) Under the high axial load, the compression damage of shield tunnel segments is almost unaffected by bolts.
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Cite this article:
QI Meilin FENG Kun GUO Wenqi LU Xuanyi HE Chuan
.Study on the Influence of Bolt Failure on Bending Strength of Longitudinal Joint of Shield Tunnel Segments[J] MODERN TUNNELLING TECHNOLOGY, 2023,V60(4): 128-137
2023, Vol. 60 