A self-designed device for testing the waterproof performance of double-sealing gaskets is applied in a super-large diameter shield tunnel to conduct water pressure resistance experiments on the inner and outer double-sealing gaskets considering bolt holes.Through these experiments,the waterproof performance of bolt-hole on double-sealing gasket systems is investigated.The results demonstrate the following:(1)The bolt holes control the overall waterproof performance of the double-sealing gaskets fixed on the inner and outer sides of the segmental joint.When they leak under insufficient waterproof capacity,the improvement in waterproof performance of double-sealing gaskets is less,compared to that when a single-sealing gasket is used.(2)The waterproof performance of double-sealing gaskets is considerably enhanced with sufficient waterproof performance of the bolt holes.(3)The waterproof performance of bolt holes should meet the collaborative waterproof requirements of double-sealing gaskets when applying them in super-large diameter shield tunnels.
shield tunnelsegmental joint waterproofdouble-sealing gasketsbolt-hole waterproofhigh water pressurewaterproof test
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