Research on the Development of Invert-filling Disengaging Caused by Differential Settlement
Research purposes:To assess the effects of differential settlement on disengagement in shield tunnel invert-filling,a numerical model of a staggered 3D shield tunnel was developed,integrating segments,rebars,and bolts.The model's accuracy was validated through a full-scale test.This research examines the influence of varying invert-filling lengths and different expansion joint placements on invert-filling disengagement due to differential settlement.Research conclusions:(1)With consistent rates of tunnel differential settlement,non-overlapping expansion joints in the invert-filling with the tunnel ring joints contribute positively to the combined strength of the invert-filling and the tunnel.(2)Variations in invert-filling lengths do not alter the extent of damage or the'spindle'pattern of disengagement;however,they do impact the disengagement scope on the invert-filling's bottom surface.An increase in invert-filling length correlates with a broader damage range in the central block invert-filling.(3)When the invert-filling's expansion joint does not coincide with the tunnel ring joint,the damage severity at the invert-filling's base intensifies,with damage or disengagement occurring along the tunnel ring joint.The proximity of the invert-filling's expansion joint to the segment's midline enhances the invert-filling-tunnel integrity,reduces the damage severity at the base,and increases the damage range.(4)The research in this paper can provide reference for the disease treatment of invert-filling disengagement in shield tunnel.
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