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  Performance Analysis of Different Radial Joint Shapes in Segmental Tunnel Lining

  One of the main concerns regarding the performance of radial joints in segmental tunnel lining has not well studied in spite of many researches and experiences. The radial (longitudinal) joint of segmental lining, i.e. the contact joint between segment to segment in a segmental ring, is chosen and designed in the form of either flat or curved shape. From technical and economical points of view, applying design criteria for the most suitable shape of radial joint plays a major role in dimensioning of segmental tunnel lining. This paper deals with the performance analysis of different features of the radial joints to be applied for both RC and SFRC segmental linings. In more details, the design criteria described in this paper mainly focuses on determining bursting and splitting stresses resulted from radial joint action and on evaluating required traditional steel or fiber characteristics to meet ULS requirements. Three distinct calculation methods are suggested to help the design engineer evaluating and choosing the most effective radial joint shape. All advantages and disadvantages of such radial joint shapes are well addressed in this paper.

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