Parametric Analysis on Joint Opening Width of Concrete Segmental Lining

Joint opening width is a major indicator to assess the safety of concrete segmental linings. A new joint mechanical model is briefly introduced. Full-scale tests of the segmental lining joint of Shanghai Metro Line 13, subjected to both sagging moment and hogging moment, indicate that the joint model is capable of describing the joint behavior more accurately. Moreover, the joint opening width in different stress states can be obtained and the limit joint opening width can be quantified. The joint model is then used to investigate the influences of tunnel depth, segment thickness, pre-tightening force of bolt, and soil stiffness on the limit joint opening width. Parametric studies show that the limit joint opening width is dependent on the stress state of the joint. The limit joint opening width obtained in this study could be potentially used as a safety indicator for concrete segmental linings.