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Abstract In the construction stage, due to construction errors and longitudinal differential settlement during tunnel operation, the amount of dislocation and opening at the segment joint increases, increasing the likelihood of water leakage. Therefore, it is necessary to conduct an in-depth study on the influence of the dislocation and opening amount at the segment joint on the contact stress of the section. Firstly, through theoretical analysis, this paper deduces that the waterproof performance of the gasket depends not only on its own contact area, linear compression stiffness, and Poisson’s ratio but also on the height of the segment joint specimen and the amount of joint opening caused by the sinking offset angle. Then, the effects of different openings and dislocations at the segment joints on the contact stress of the segment gasket section were compared using numerical simulation and model experiments. The results show that the influence of the opening amount on the waterproof performance of the tunnel segment joint’s sealing gasket is greater than that of the dislocation, and the waterproof rate of the joint of the segment sealing gasket section is greater than 40% under the modified condition.
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Zhang et al. (2024) studied this question.