Experimental Investigation on the Influence of Regional Concrete Spalling on Shield Tunnel Segments

Wang, Shimin; Liu, Chuankun; Ma, Gaoyu; Cao, Songyu; Zhang, Junbo; Lu, Daiyue; He, Chuan

doi:10.1155/2019/1829124

Cited by 6 publications

(4 citation statements)

References 20 publications

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“…Liu et al designed and performed full-scale experiments relating to the structural bearing capacity of stagger joint assembled shield tunnels based on an unloading situation [9], which combined engineering practices relevant to the current urban metro with circumferential disturbances. Based on the field investigation and analysis, Wang et al compared and analyzed the mechanical characteristics of the segment structure in shield tunnels under the circumstances of different concrete spalling regions by the method of the similarity model experiment [10]. A novel loading setup was developed by Huang et al [11] for performing full-scale loading tests on "standing" segmental lining of a subrectangular shield tunnel, which for the first time allowed the mechanical behavior of the segmental lining subject to self-weight to be assessed in a full-scale loading test.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study on the Fracture Properties of Concrete Shield Tunnel Lining Segments

2021

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Shield tunnel lining structure is usually under very complex loading conditions in the underground space. As a kind of the common concrete structures, any defect in the tunnel lining segment may deteriorate its bearing capacity and even cause severe disasters. Three-dimensional numerical models of shield tunnel lining segments with initial cracks are built using the Symmetric Galerkin Boundary Element Method- (SGBEM-) Finite Element Method (FEM) Alternating Method. The cracking load and ultimate load of the tunnel segments are obtained, and crack propagation under fatigue load is also simulated by employing the Paris Fatigue Law. Results show that loading eccentricity has a very large influence on the bearing capacity of the cracked lining segment; the larger the loading eccentricity, the smaller the bearing capacity. Deformation and damage of the lining segment show obvious phases, which consist of the initial crack, cracking stage, steady crack propagation, unsteady crack propagation, and eventual failure.

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Section: Introductionmentioning

confidence: 99%

Numerical Study on the Fracture Properties of Concrete Shield Tunnel Lining Segments

2021

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“…Unlike single tunnels with a circular or straight wall arch cross section which have been profoundly investigated [2][3][4][5][6][7][8][9], due to its special geometry, the distribution of internal forces of double-arched tunnels has not yet been well understood. Yan et al set up a comprehensive monitoring program at critical sections of a double-arched tunnel to measure the internal forces in both steel arches and secondary linings [10].…”

Section: Introductionmentioning

confidence: 99%

Analytical Solutions for the Mechanical Responses of Shallow Double‐Arched Tunnel Subjected to Symmetric Loads

Yang

Dai²,

Ai³

et al. 2021

Advances in Civil Engineering

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Double-arched tunnel is a special kind of tunnel structure which is widely adopted for shallow rock tunnels. The internal forces within a double-arched tunnel are difficult to be determined due to its special geometry and complex interactions with surrounding rock masses. This paper presents a set of analytical solutions for determining the internal forces within the lining structure of shallow double-arched tunnel subjected to symmetric external loads. The double-arched tunnel is decomposed into three main parts, i.e., the arch rings, the side walls, and the middle wall. The force method and the elastic foundation beam model are employed for the arch rings and the side walls, respectively, while the middle wall is treated as a cantilever beam fixed at the bottom. Analytical solutions for the internal forces of the three parts are derived separately, which are continuous at the conjunctions of different parts. The derived analytical solutions are verified by comparing with the FEM simulation results. Finally, parametric studies are performed to investigate the influences of burial depth, elastic resistance coefficient, opening angle, and tunnel span on the internal forces based on which some recommendations are provided for the construction and design of the double-arched tunnels. The derived analytical solutions provide fast estimations for the internal forces and deformation of the double-arched lining structures, which will be a useful tool for design optimization.

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“…Yan et al [14] used the extended finite element method (XFEM) to explore the fracture properties of an underwater shield segment, and the impacting load of high-speed train was considered in this study. rough data analyses of acoustic emission, Wang et al [15,16] conducted some experimental studies on the damage evolution characteristics of shield tunnel segment with cracks. A novel multiscale modelling method was proposed by Wang et al [17] to analyse the random propagation of multiple cracks and its mechanical behaviours of shield segments.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Research on Defective Shield Segment under Cyclic Loading

Tian

Chen³

2021

Shock and Vibration

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The retaining structure of a shield tunnel is usually subjected to static loading; however, cyclic loading such as the vibration loading of the train will act on the lining structure year after year that cannot be neglected. Due to the complex manufacturing and assembling process of the lining segment, initial defects in the segment are inevitable. Such defects will propagate under the cyclic loading such as the train vibration, which may cause a large threat to the shield tunnel system. In this paper, a defective shield tunnel lining segment under cyclic loading is studied by both a full-scale experiment and three-dimensional numerical simulations to investigate its fracture properties and failure mechanism and make a rational estimate of its fatigue life. Results show that crack propagation of the defective shield tunnel segment can be identified as several different stages based on its deformation characteristics, and the failure pattern of the segment is determined by its initial defects. The results by the experiment and numerical investigation are in good agreement for each other.

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Experimental Investigation on the Influence of Regional Concrete Spalling on Shield Tunnel Segments

Cited by 6 publications

References 20 publications

Numerical Study on the Fracture Properties of Concrete Shield Tunnel Lining Segments

Numerical Study on the Fracture Properties of Concrete Shield Tunnel Lining Segments

Analytical Solutions for the Mechanical Responses of Shallow Double‐Arched Tunnel Subjected to Symmetric Loads

Experimental and Numerical Research on Defective Shield Segment under Cyclic Loading

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