Abstract:

For shield lining with low axial force level and complex stress process, such as waterconveyance tunnel, contact passage, and shieldbored station, the model calculation requires higher requirements for the stiffness and strength of joints vary with the nonlinear of lining force. Based on such shield tunnel lining, a shellcontact model for calculating shield lining segments is proposed. The design model considers the spatial distribution of circumstantial and longitudinal bolts in the direction of segment thickness, and adopts the design concept of "pressureshear coupling" at segment joints. In this paper, the nonlinear relationship between bending stiffness and internal force of model joints is reflected by the bending model test. By comparing the results of analysis with the shellspring model, the nonlinear characteristics of the overall shear stiffness and shear strength of the model joint are reflected by the difference of the segment dislocation, and the actual contribution of the bolts to the lining under load can be reflected by the mechanical difference of bolts. Through the above analysis, the rationality of the shellcontact model to the lining mechanical behavior simulation is verified.

Key words: shield tunnel lining, shellcontact model, pressureshear coupling, low axial force