Review of health inspection and reinforcement design for typical tunnel quality defects of voids and insufficient lining thickness

Han, Wei; Jiang, Yujing; Wang, Gang; Chuanzheng, Liu; Koga, Dairiku; Luan, Hengjie

doi:10.1016/j.tust.2023.105110

Cited by 10 publications

(2 citation statements)

References 68 publications

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“…For the various quality problems exposed by the secondary lining of mountain tunnels, many scholars have summarized a large number of experiences from the concrete lining [5] such as the compression damage of concrete lining [6], concrete lining maintenance temperature [7], concrete lining stress [8], concrete lining thickness insufficiency [9], the preparation of high-performance concrete [10], and the concrete lining pressure grouting technology [11] so as to reach a conclusion regarding the prevention and management system for dehiscence, cracks, and other diseases. Although the current management of engineering quality problems has achieved remarkable results [12], to solve the quality problems of mountain tunnel casting from the root, it is necessary to start from the flow characteristics of concrete itself in order to reveal the flow characteristics of freshly mixed concrete during the lining casting process and then grasp the root of the problems.…”

Section: Introductionmentioning

confidence: 99%

Study on the Characteristics of Circumferential and Longitudinal Flow of Vault Concrete during Tunnel Lining Pouring Processes

Yang,

Wu,

Zhou

2024

Materials

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With a large number of railroad and highway tunnels opening for operation, the diseases caused by hidden lining defects are increasing. The study of flow characteristics of freshly mixed concrete during tunnel lining casting is the key to revealing the formation mechanism of hidden defects. This paper revealed the location of blank lining formation by investigating the circumferential and longitudinal flow characteristics of concrete in the vault during tunnel pouring to provide suggestions for improving the quality of tunnel lining pouring for the various projects. This paper adopted the method of indoor testing, selected the suitable working conditions and flow parameters, validated the accuracy of the test with a numerical simulation, and simulated the secondary lining pouring process of the tunnel arch from the circumferential direction and longitudinal direction. This revealed the flow characteristics of the freshly mixed concrete in the process of pouring the arch lining. The flow of concrete in the arch lining was basically characterized by two major features which were similar to the flow in the pumping pipe and the layered flow. It also revealed the relationship between the concrete flow rate, flow distance, and the location of the formation of the blank lining risk zone with the slump of the concrete, the pumping pressure, and the radius of the tunnel.

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Section: Introductionmentioning

confidence: 99%

Study on the Characteristics of Circumferential and Longitudinal Flow of Vault Concrete during Tunnel Lining Pouring Processes

Yang,

Wu,

Zhou

2024

Materials

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“…Due to various factors including tunnel construction and management practices, geological conditions, service environment, and duration, a significant number of operational tunnels exhibit quality defects and issues, such as voids behind the lining, insufficient lining thickness, water seepage, and lining cracking. Among these issues, structural cracking is particularly prominent, leading to severe performance degradation of tunnels and the posing of a threat to their operational safety [1][2][3]. Currently, the lining reinforcement and strengthening methods include paste fibre, sleeve arch reinforcement, shotcrete reinforcement, and steel plate reinforcement.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Characteristics of Cracked Lining Reinforced with Steel Plate–UHPC Subjected to Vertical Load

Wei,

Ding,

Shen

et al. 2024

Buildings

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The steel plate reinforcement method is widely used for strengthening damaged linings. Nevertheless, low durability is one of the disadvantages of the steel plate reinforcement method, which uses epoxy resin as the interface binder. To enhance the load-bearing performance and strengthening effect of steel-plate-reinforced structures, this study introduced ultra-high performance concrete (UHPC) as the reinforcing bonding layer and proposed a novel method for steel plate–UHPC reinforcement of cracked linings. A mechanical performance model test was conducted on a 1/5 scale lining model using a loading test device to evaluate the load-bearing performance and stress deformation of both conventional steel plate and steel plate–UHPC reinforced cracked linings. The characteristics, mechanisms of failure, and impacts of strengthening of the steel plate reinforcement method and steel plate–UHPC reinforcement method for cracked linings were compared. A numerical simulation model was developed to investigate the reinforcement effect of cracked linings using steel plate–UHPC reinforcement. The analysis included examining the influence of steel plate thickness, UHPC bonding layer thickness, and reinforcement timing. Model test results show that the overall damage mode of the steel plate–UHPC-reinforced structure had good elastic–plastic behaviour, and the deformation and damage process under the vertical concentrated load can be divided into four typical phases. Compared with the traditional steel plate reinforcement, the ultimate load-carrying capacity and ductility of the steel plate–UHPC-reinforced structure were increased by 53% and 366%, respectively, showing significantly better load-carrying capacity and deformation performance. Numerical simulation results show that the reinforced structure’s load-carrying capacity and stiffness enhancement rate increased non-linearly with the increase in UHPC layer thickness and steel plate thickness. However, reasonable reinforcement timing exists for steel plate-UHPC reinforcement, and too late reinforcement timing leads to a decrease in structural load-carrying capacity and stiffness enhancement rate.

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Analytical Solution of the Non-circular Tunnel with a Void Defect in the Complex Stress Field

Wang,

Niu,

Wang

et al. 2024

KSCE J Civ Eng

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Review of health inspection and reinforcement design for typical tunnel quality defects of voids and insufficient lining thickness

Cited by 10 publications

References 68 publications

Study on the Characteristics of Circumferential and Longitudinal Flow of Vault Concrete during Tunnel Lining Pouring Processes

Study on the Characteristics of Circumferential and Longitudinal Flow of Vault Concrete during Tunnel Lining Pouring Processes

Mechanical Characteristics of Cracked Lining Reinforced with Steel Plate–UHPC Subjected to Vertical Load

Analytical Solution of the Non-circular Tunnel with a Void Defect in the Complex Stress Field

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