Abstract
A series of local prototype tests are conducted on the Sutong GIL (Gas-Insulated Line) and Shiziyang Tunnel. These tests investigate the redistribution law of segment deformation and the bending moment during construction. The results reveal that the transfer ability of deformation and the bending moment improve with an increase in the longitudinal force. Stage characteristics are observed for the effect of the longitudinal force on the opening of the circumferential joints. Segments are fully contacted for the circumferential joints when the joint opening is not observed. The frictions between the segments are the key factors for the bending moment and segment deformation control. The opening of the circumferential joint with an increase in the joint opening then becomes the primary control factor. The transfer ability becomes stable when the load continues increasing after mortise and tenon contact. Better transfer ability occurs with a general segment with four pairs of mortises and tenons. This was presented as a smaller value of an increasing rate and the stable magnitude of the joint opening. From the perspective of practical engineering, mortises and tenons can be added to the vault to increase the load and deformation transfer ability of the general segment after the loss of the longitudinal force.
Highlights
In shield tunnels, the longitudinal force and the connection of the segment joints significantly influence the coordination of the internal force distribution and the displacement of the combined segment structure [1, 2]
The uncoordinated deformation of different segments in the ring direction is often caused by the interring dislocation, which affects the uniform distribution of the load in the longitudinal direction of the segment. erefore, improving the longitudinal restraint force and selecting the appropriate ring joint structure represent an effective way to improve the dislocation deformation and force between the rings under this condition. e segment ring joint structure directly impacts the ring dislocation and the ring joint opening
During the jacking process of the construction period, when the longitudinal force is reduced during the operation period, the dislocation between the rings and the opening of the ring joints are directly related to the longitudinal restraint force. erefore, it is the essence of the research content to discover the interaction relationship and mechanism of the structural form of the circumferential joint, the longitudinal force, the opening of the circumferential joint and the internal force distribution, and deformation of the structure
Summary
The longitudinal force and the connection of the segment joints significantly influence the coordination of the internal force distribution and the displacement of the combined segment structure [1, 2]. Tang [23] combined the finite element model and theoretical methods to derive the relationship between the opening of the circumferential joint, the longitudinal stiffness, and the radius of curvature of the segment structure. Salemi et al [26] studied the shear process and crosssectional deformation of the circumferential joint, the internal force of the bolts at different positions, and the mechanical behavior of the mortise and tenon. E influence of the longitudinal force and ring connection structure on the force transmission performance and displacement coordination mechanism between the segments is explored. The connection between the rings directly affects the integrity of the structure during the construction process. erefore, it is critical to determine the overall mechanical performance of the structure under the different layouts of the mortise and tenon between the rings and analyze the influencing factors
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