Waterproof Performance Analysis of Different Shield Tunnel Segment Gasket Configurations
In order to study the influence of cross-sectional configuration of gaskets at the joints of large-diameter shield tunnels on waterproof performance,numerical models of gaskets with triangular,circular and semi-circular+triangular configurations were constructed,and the contact stress of gaskets under different combinations of opening and misalignment was analyzed.The results show that the triangular and circular gaskets contact stress is distributed with a large distribution at both ends and a small distribution in the middle.The compression reaction force in the solid area of the cross-section is relatively large,and peak stress appears when transmitted to the contact surface.The stress in the open hole area is relatively small.The deformation and stress state of the gasket in staggered compression are more complex.As the amount of misalignment increases,the contact surface becomes more twisted and the contact path changes.With the development of misalignment,the contact paths of triangular and circular gaskets become longer,while the contact paths of semi-circular and triangular gaskets become shorter.Based on the box plot analysis,a median contact stress evaluation index is proposed,which can eliminate outliers and reflect the contact surface situation more accurately.
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