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  Experimental and Numerical Study on Waterproof Behavior of Segmental Joints in Hydraulic Shield Tunnels

  Segmental joints are vulnerable parts in the shield tunnels, and the waterproof ability of the sealing gaskets is an important indicator to ensure the safety and operation of the hydraulic tunnel. Based on the Pearl River Delta water resources allocation project, the waterproof capacity of segmental joints is experimentally studied. And a new numerical method, including fluid pressure penetration and mesh-to-mesh solution mapping, is introduced to reveal the sealant mechanism of the gaskets. The research results indicate: (1) waterproofing ability of the sealing gasket is largely related to the compression amounts, and the seepage phenomenon varies accordingly; (2) the gasket section used in this project can satisfy the waterproof indicators, and several suggestion are proposed to ensure the waterproof performance; (3) the numerical results are identical to the experimental data, which demonstrates the accuracy and reliability of the simulation method, and it can be promoted to analyze the waterproof behavior of the segmental joints and direct the engineering design.

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