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Articles 1 - 6 of 6
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 …
Analytical Method To Estimate The Influence Of Foundation Pit Excavation Adjacent To The Station (Working Shaft) On The Underlying Shield Tunnel, Zu-Xian Wang, Cheng-Hua Shi, Chen-Jie Gong, Cheng-Yong Cao, Jian-Wen Liu, Zhu Peng
Analytical Method To Estimate The Influence Of Foundation Pit Excavation Adjacent To The Station (Working Shaft) On The Underlying Shield Tunnel, Zu-Xian Wang, Cheng-Hua Shi, Chen-Jie Gong, Cheng-Yong Cao, Jian-Wen Liu, Zhu Peng
Rock and Soil Mechanics
The shield tunnel is typically simplified as an infinite beam with two free ends in existing analytical models, which are used to calculate the longitudinal deformation of the underlying shield tunnel induced by the excavation of a foundation pit. However, the applicability of those analytical models is limited due to the simplification. The current study is aimed at estimating analytically the longitudinal deformation of the underlying shield tunnel induced by the excavation of a foundation pit adjacent to the station (working shaft). The constraint on the shield tunnel generated by the joint between the station (working shaft) and the tunnel …
Parameter Back-Analysis Of Hardening Soil Model For Granite Residual Soil And Its Engineering Applications, Min Zhu, Xiang-Sheng Chen, Guo-Tao Zhang, Xiao-Chao Pang, Dong Su, Ji-Qiang Liu
Parameter Back-Analysis Of Hardening Soil Model For Granite Residual Soil And Its Engineering Applications, Min Zhu, Xiang-Sheng Chen, Guo-Tao Zhang, Xiao-Chao Pang, Dong Su, Ji-Qiang Liu
Rock and Soil Mechanics
In recent years, construction works near the operating metro tunnel in granite residual soil have been gradually increasing, and the impact of these construction works on the safety of shield tunnel should not be ignored. Finite element method is an effective method to evaluate the influence of adjacent construction on shield tunnel, but its reliability highly depends on the reasonable selection of soil constitutive model and parameters. In this paper, the current situation of parameter selection of hardening soil model for granite residual soil is firstly reviewed. Then a back-analysis method for determining the parameters of granite residual soil based …
Seismic Vulnerability Analysis Of Shield Tunnels Considering Cavitation, Yu-Sheng Chen, Zu-De Ding, Hao Zi, Zheng-Chu Liu, Xia-Fei Ji
Seismic Vulnerability Analysis Of Shield Tunnels Considering Cavitation, Yu-Sheng Chen, Zu-De Ding, Hao Zi, Zheng-Chu Liu, Xia-Fei Ji
Rock and Soil Mechanics
The existence of cavities behind the segments is one of the common disease phenomena in shield tunnels. The cavities not only affect the static mechanics behavior of soil and segment, but also directly affect the dynamic response of the tunnel, which could aggravate the tunnel’s seismic damage. The existing related researches all use the deterministic analysis methods and lack the quantitative evaluation method in terms of probability perspective. Taking a shield tunnel in a rail transit section as an example, considering factors such as the location and size of the cavity, site conditions, and the incident direction of seismic wave, …
Analytical Solution Of Additional Response Of Shield Tunnel Under Asymmetric Jack Thrust, Zu-Xian Wang, Cheng-Hua Shi, Jian-Wen Liu
Analytical Solution Of Additional Response Of Shield Tunnel Under Asymmetric Jack Thrust, Zu-Xian Wang, Cheng-Hua Shi, Jian-Wen Liu
Rock and Soil Mechanics
When shield is driving along a curve alignment or during deviation correction, the asymmetrical thrust will generate an additional bending moment at the head of the tunnel, which will cause construction problems such as longitudinal deformation of the tunnel and dislocation between rings. Based on the theory of elastic foundation beam, the shield tunnel is simplified as a Timoshenko beam in Winkler foundation, an analytical model for evaluating the additional response of the shield tunnel induced the asymmetric thrust is established, and the analytical solutions of longitudinal deformation and internal force of shield tunnel are deduced. Then the correctness and …