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Full-Text Articles in Civil and Environmental Engineering
Numerical Study On Seismic Behavior Of Shield Tunnel Crossing Saturated Sandy Strata With Different Densities, Hong Wu, Zhi Ye, Yu-Ting Zhang, Hua-Bei Liu
Numerical Study On Seismic Behavior Of Shield Tunnel Crossing Saturated Sandy Strata With Different Densities, Hong Wu, Zhi Ye, Yu-Ting Zhang, Hua-Bei Liu
Rock and Soil Mechanics
Earthquake-induced liquefaction poses a significant threat to underground structures. Particularly, tunnel structures located at the interface of different liquefaction-resistant strata are more prone to severe seismic damages. In this paper, a three-dimensional numerical study was carried out to investigate the seismic response of a shield tunnel passing through saturated sandy strata with different densities. Firstly, a boundary interface model that describes the liquefaction behavior of sand with different densities was used to simulate saturated sand, which was validated by shaking table experiments on a tunnel embedded in liquefiable soil. Secondly, a multi-degree- of-freedom link spring is applied to characterize the …
Analysis Of Longitudinal Deformation Of Shield Tunnel Subjected To Shield Tail Asymmetric Thrust, Zhi-Wei Zhang, Rong-Zhu Liang, Zhong-Chao Li, Lian-Wei Sun, Wen Shen, Wen-Bing Wu
Analysis Of Longitudinal Deformation Of Shield Tunnel Subjected To Shield Tail Asymmetric Thrust, Zhi-Wei Zhang, Rong-Zhu Liang, Zhong-Chao Li, Lian-Wei Sun, Wen Shen, Wen-Bing Wu
Rock and Soil Mechanics
When the shield machine is driving along a curve alignment or during deviation correction, the asymmetrical thrust will generate an additional bending moment on the head of the segmental rings, which will cause longitudinal deformation of the shield tunnel. Current analytical methods commonly simplify the existing tunnel as an equivalent continuous beam, which will overlook the weakening of the circumferential joint. In this study, a simplified longitudinal beam-spring shield tunnel model (SLBSM) is established, which can simultaneously consider the opening and dislocation between segmental rings. Then, the shield tunnel under construction is simplified as an SLBSM resting on the Winkler …