Numerical investigation of the mechanical behavior of deformed segmental tunnel linings, strengthened by epoxy-bonded filament wound profiles

Liu, Xian; Jiang, Zijie; Yuan, Yong; Mang, Herbert A.

doi:10.1016/j.tust.2018.04.033

Cited by 24 publications

(10 citation statements)

References 11 publications

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“…e stress-strain diagram of concrete adopted in this study is presented in Figure 2(a), which is similar to the concrete model proposed by Park and Paulay [30] and has been widely adopted for the FE simulations of shield tunnel segments [29]. In compression, the stress and strain responses follow a parabolic stress-strain curve up to the compressive strength σ c , and then, the stress decays linearly with strain until ultimate strength σ cu is reached.…”

Section: Constitutive Model and Parametersmentioning

confidence: 89%

“…In the experiment, the tensile strength and the shear strength of the epoxy resin, which was used to ll the gap between the steel plate and the lining, were 1.65 MPa and 6.83 MPa, respectively [29]. When the normal stress and the shear stress of the adhesive layer exceeded their corresponding strengths, bonding failure occurred.…”

Section: Comparison With the Experimentalmentioning

confidence: 98%

“…Several numerical investigations about the shield lining strengthened by a thin plate were conducted, and the interface between the segment and the thin plate was modelled by a tie contact [27], zero-thickness contact elements [28], or fractious springs [29]. e focus of these studies was the structural behaviour of the shield lining after it was strengthened by the thin plate, i.e., bearing capacity and deformation, rather than the interfacial behaviour.…”

Section: Introductionmentioning

confidence: 99%

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Interfacial Behaviour of Shield Tunnel Segment Strengthened by Thin Plate at Inner Surface

Liu

Guo

Yao

2022

Advances in Materials Science and Engineering

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The strength and stiffness of a shield tunnel segment can be improved significantly by bonding a steel plate at its inner surface. In this kind of strengthened segment, interface debonding is usually the controlling failure mode, and it strongly depends on the interfacial stresses of the adhesive layer between the segment and the steel plate. To deepen the understanding of the interfacial behaviour, this study proposes a three-dimensional fine finite element (FE) model regarding the interfacial stresses. An existing full-scale experimental result is then employed to confirm the feasibility and accuracy of the proposed model. Further, the fine finite element model is used to calculate the interfacial stress distributions and to evaluate the structural parameters on the interfacial behaviour of the strengthened segment. A high concentration of interfacial stresses exists at the vicinity of the steel plate ends and the joints, which might result in premature failure at these locations. Both the normal and shear stresses at the interface are significantly influenced by the structural parameters. The findings in this study can provide guidance for the optimal design of strengthened shield segment that can prevent premature interfacial debonding.

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Section: Constitutive Model and Parametersmentioning

confidence: 89%

Section: Comparison With the Experimentalmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

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Interfacial Behaviour of Shield Tunnel Segment Strengthened by Thin Plate at Inner Surface

Liu

Guo

Yao

2022

Advances in Materials Science and Engineering

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“…Then, further research could be conducted to determine the overall structural responses of the tunnel linings suffered large deformations (Afshan et al, 2017) and accumulative deformations (Yi et al, 2019). To mitigate the change in tunnel lining shape, Liu et al (2018b) proposed a novel strengthening method that utilizes epoxy-bonded filament wound profiles, and Zhai et al (2020) provided insight into the strengthening effectiveness of steel plates for overdeformed segmental tunnel linings.…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis of size effect on the deformation behavior and damage evolution mechanism of segmental tunnel lining rings

Zhao¹,

Han

et al. 2023

International Journal of Damage Mechanics

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This article investigates the size effect of segmental tunnel linings on the deformation behavior and the damage evolution mechanism using the Finite Element Method (FEM). A series of models with different diameters are established under the same loading condition to control the variable. The bolts and the rebar apply the elastic-plastic model. The Concrete Damage Plasticity model has been considered for the concrete lining. The vertical convergence deformation, internal force of these models, and damage to the segment body are selected for comparison. The number and location of the yielded bolts are explored for the analysis of the overall structure stiffness and damage evolution mechanism. In terms of plastic hinge theory, an extended discussion is carried out to explain the differences in damage evolution mechanisms in different-sized linings. The results show the large-diameter lining rings have a relatively greater increasing rate of convergence deformation. Furthermore, fewer plastic hinges emerged in large-scale lining rings before the structures reached their ultimate strength. According to the experimental results, we can know that the failure of large-diameter has the characteristic of more brittle damage than that of small-diameter one and these large-size structures are prone to become unstable geometry.

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“…Studies show that structure strengthening is an effective treatment for the vault void problem. Currently, structure strengthening methods can be mainly divided into three categories, including pasting a high-strength fiber layer [14,15], sticking a steel plate [16][17][18][19][20], and constructing an umbrella arch [21,22]. In an operating highway tunnel with a void problem, numerous auxiliary facilities such as lighting and fans are installed near the vault, limiting the available space margin for the strengthened structure.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on the Mechanical Properties of Vault Void Lining in Highway Tunnels and Steel Plate Strengthening

Shao

Zhang

et al. 2022

Applied Sciences

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In the present study, large-scale specimens based on the tunnel prototype were prepared and static load tests were carried out to investigate the damage caused by lining voids. Based on the strengthening scheme of the tunnel, the strengthened specimens were prepared to explore the strengthening effect on the strengthening structure. The strengthening structure is made of a steel plate fixed with chemical anchor bolts and two-component epoxy adhesive. By analyzing the failure mode, structural deformation, and the relationship between load and strain, the damage caused by vault void with various void heights was analyzed and the obtained results were verified through the experiment. Moreover, the enhancement of the bearing capacity and stiffness of the structure strengthened by surface bonding steel was studied. The obtained results show that the damage caused by the lining void mainly occurs at the void boundary. The damage appears as multiple longitudinal cracks. The crack starts from the lower surface and develops radially. Using chemical anchor bolts and two-component epoxy adhesive to bond the steel plate on the lining surface, the damage can be reduced, and the bearing capacity of the structure can be improved effectively when the void height is a quarter of the second lining thickness, the number of cracks is reduced from 14 to 5 after steel plate strengthening, and the length of the longest crack is reduced from 13.2 cm to 8.3 cm, reduced by 37.12%. The steel plate strengthening also reduces the strain of the lower steel bar at the void boundary from 1130.58 με to 555.12 με, and the strain decreases by 50.89%. The experimental results show that the position where the void has the greatest impact on the lining is at the void boundary. Therefore, when steel plates are used to strengthen the void lining, the void boundary should be emphasized, which makes the strengthening more accurate and saves the cost of treatment.

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Numerical investigation of the mechanical behavior of deformed segmental tunnel linings, strengthened by epoxy-bonded filament wound profiles

Cited by 24 publications

References 11 publications

Interfacial Behaviour of Shield Tunnel Segment Strengthened by Thin Plate at Inner Surface

Interfacial Behaviour of Shield Tunnel Segment Strengthened by Thin Plate at Inner Surface

Numerical analysis of size effect on the deformation behavior and damage evolution mechanism of segmental tunnel lining rings

Experimental Investigation on the Mechanical Properties of Vault Void Lining in Highway Tunnels and Steel Plate Strengthening

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