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Full-scale experimental investigation on stagger effect of segmental tunnel linings
Abstract It is known that the local joint behavior has a significant influence on the overall performance of the lining structure. However, few direct experimental investigations focus on their relationship. A series of full-scale experiments are designed and performed to obtain the structural bearing capacity of single rings and stagger-jointed multiple rings based on a peripheral unloading situation, representing engineering examples relevant to the urban metro with surrounding disturbances. The study investigated ring specimens with commonly used connection types, including longitudinal joints connected using straight bolts, bent bolts, and fast-slide connectors and two types of circumferential joints: tongue-and-groove and plain. The test results described the progressive failure mechanisms and the ultimate capacities of both single and multiple rings. The stagger effect, which existed in the multi-ring specimens caused by the stagger-joint assembly method, was discussed. It showed that the failure of single rings originated from the longitudinal joint while the failure of multiple rings depended on the stagger effect. With a strong stagger effect, the first plastic hinge of multiple rings tended to form at the segment body instead of the longitudinal joint, indicating a full utilization of the segment capacity. By adjusting the stagger effect, the first plastic hinge can simultaneously be formed at the longitudinal joint and the segment body. As a result, the lining structure can achieve its maximum ultimate bearing capacity.
Full-scale experimental investigation on stagger effect of segmental tunnel linings
Abstract It is known that the local joint behavior has a significant influence on the overall performance of the lining structure. However, few direct experimental investigations focus on their relationship. A series of full-scale experiments are designed and performed to obtain the structural bearing capacity of single rings and stagger-jointed multiple rings based on a peripheral unloading situation, representing engineering examples relevant to the urban metro with surrounding disturbances. The study investigated ring specimens with commonly used connection types, including longitudinal joints connected using straight bolts, bent bolts, and fast-slide connectors and two types of circumferential joints: tongue-and-groove and plain. The test results described the progressive failure mechanisms and the ultimate capacities of both single and multiple rings. The stagger effect, which existed in the multi-ring specimens caused by the stagger-joint assembly method, was discussed. It showed that the failure of single rings originated from the longitudinal joint while the failure of multiple rings depended on the stagger effect. With a strong stagger effect, the first plastic hinge of multiple rings tended to form at the segment body instead of the longitudinal joint, indicating a full utilization of the segment capacity. By adjusting the stagger effect, the first plastic hinge can simultaneously be formed at the longitudinal joint and the segment body. As a result, the lining structure can achieve its maximum ultimate bearing capacity.
Full-scale experimental investigation on stagger effect of segmental tunnel linings
Liu, Xian (author) / Zhang, Yumeng (author) / Bao, Yihai (author)
2020-04-07
Article (Journal)
Electronic Resource
English
| British Library Online Contents | 2017
Radial Joints for Precast Segmental Tunnel Linings
| NTIS | 1982