Experimental Research of Stiffness Weakening Effect on Joint of Shield Tunnel Lining Structure

Based on the elastic model experiment of duct pieces lining structure within one shield tunnel testing section of metro line, we research normal bending resistance which is affected by the moment of arch crown on the longitudinal joint of lining structure, get the weakening factor of anti-bending stiffness which is affected by pre-tightening load of different bolts on the joint of duct pieces, deduce the bending moment, joint deformability and the stress-strain relation curve within the range of duct pieces joint, which will provide references for optimizing the design of lining structure.