Abstract: To learn the causes of damage of segment lining structure during construction of the connecting passage, the influence of segment destruction and removal on the bearing performance of shield tunnel lining ring is studied based on the threering staggered joint assembly numerical model. The results show the following. (1) The opening of the connecting passage will reduce the ultimate bearing capacity and yield bearing capacity of the shield tunnel lining by 23.7% and 25%, respectively, and the vertical and horizontal secant stiffness of the shield tunnel lining will decrease by 21% and 33%. (2) The segment joints on both sides of the segment opening and the vault of the segment opening ring, the segment joints and the middle of the segment above the segment opening ring and the segment at the waist of the arch on the side without opening are the key sections, which are prone to crack and destroy. (3) After the segment is opened, the bending moment of the segment at the key section position is greatly enlarged under the action of the same external load.

Key words:

shield tunnel, fullscale test, ultimate bearing capacity, segment opening