Experimental investigation of the ultimate bearing capacity of deformed segmental tunnel linings strengthened by epoxy-bonded steel plates

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

doi:10.1080/15732479.2017.1354892

Cited by 59 publications

(39 citation statements)

References 6 publications

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“…In this way, the second part of this study focused on the effectiveness of CFSTs for restoring segment joints damaged by a thermal shock. As compared with the traditional steel plate rings [6], the steel consumption and weight of the CFSTs employed in this paper are only about 40% and 65%, respectively. Obviously, a large amount of steel can be saved and the self-weight of the strengthening parts can be reduced greatly in practical engineering, by replacing steel plate rings with CFSTs.…”

Section: Introductionmentioning

confidence: 89%

“…Steel plates or fiber-reinforced plastic (FRP) are the two materials most commonly applied for strengthening subway tunnels. A group led by Liu [6] tested full-scale shield tunnel lining rings strengthened with 20 mm-thick steel plate rings. They found that such full-ring steel reinforcement significantly improves the bearing capacity and overall stiffness of tunnel structures.…”

Section: Introductionmentioning

confidence: 99%

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Thermal Behavior of Tunnel Segment Joints Exposed to Fire and Strengthening of Fire-damaged Joints with Concrete-filled Steel Tubes

Luo

Zang

2019

Applied Sciences

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Owing to its discontinuous configuration, segment joint is of particular concern when the shield tunnel lining is exposed to fire. The thermal behavior of such joints when exposed to fire was investigated experimentally in full scale. In addition, the effectiveness of using concrete-filled steel tubes (CFSTs) to restore joint strength after a fire was also investigated. Five full-scale reinforced concrete segment joints were fabricated. Four were exposed to the ISO 834 standard fire for 60 or 120 min, with the fifth serving as a control. Two fire-damaged specimens were then strengthened with CFSTs. All five specimens were then loaded to failure at room temperature. It was found that: (1) The effect of the joint gap on the temperature distribution was observed to change markedly during heating; (2) the temperature of the bolt end was much higher than that of the bolt mid-point, insulating the bolt ends is probably called for; (3) the bearing capacity and flexural stiffness of the fire-damaged segment joints can be significantly improved by strengthening with CFSTs.

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Section: Introductionmentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Thermal Behavior of Tunnel Segment Joints Exposed to Fire and Strengthening of Fire-damaged Joints with Concrete-filled Steel Tubes

Luo

Zang

2019

Applied Sciences

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“…To improve the circumferential stiffness of the tunnel and prevent it from further deformation (horizontal expansion and vertical convergence), the bonded steel plate method [20] was adopted as the interior strengthening method of the tunnels within the alert range (10 m to 60 m). e strengthening process is enumerated below.…”

Section: Counteracting Measuresmentioning

confidence: 99%

Deformation Characterisation and Distress Diagnosis of a Metro Shield Tunnel by Adjacent Constructions

Tingjin

Chen

Liu

2020

Advances in Civil Engineering

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This paper presents a case history of the developmental effect of a large-area excavation, 8 high-rise main buildings, a series of annex constructions, and ground overloaded building demolition on the deformation characteristics of an existing shield tunnel within Guangzhou Metro Line No. 1 in close proximity to the development. The shield tunnel lies in a sandy layer of the typical upper-soft and lower-hard strata in Guangzhou district, and the deformation of the tunnel has been monitored since the tunnel was put into operation. The monitoring results reveal that the adjacent construction induces an excessive tunnel settlement with a maximum of 14.4 mm and an excess tunnel displacement with a maximum of 5.2 mm, which are within the corresponding limitations of the codes for the safe operation of urban rail transit tunnels. While the station expansion project is being conducted beside the tunnels, a series of tunnel distresses, including large-area water seepage, spalling concrete blocks, and segmental cracks, are recorded. Our field monitoring data indicate that the tunnel is subjected to further vertical contraction and horizontal expansion due to the station expansion project, and a maximum tunnel flattening rate of 36.78% is detected. Furthermore, the tunnel linings are studied numerically and theoretically to obtain the limitations of tunnel deformation and discuss why tunnel distresses of water seepage, concrete spalling, and segmental cracking occur. Finally, on the basis of the analyses and discussions above, counteracting corrective measures, including compensation grouting soil strengthening and bonded steel plates, are adopted as exterior and interior strengthening methods, respectively, to eliminate further tunnel distresses and ensure safe operation. The lessons learned and summarized in this study may help prevent similar tunnel distresses from reoccurring in the future.

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“…Fang et al have analyzed the mechanical property of segment lining for the shield tunnel segment of Lanzhou metro across Yellow River by the method combined with model test and numerical simulation [14]. Liu et al have conducted full-scale experiment focusing on the segment in quasirectangular shield tunnel and analyzed the effects of reinforcement of "T"-shaped section, the position of longitudinal joints, and the shear capacity on the structural mechanical property [15,16]. Zhou et al have completed laboratory impact test by the equipment application for drop hammer test of synchronous measuring system and have analyzed the effect of loading direction on the failure mode of cracked tunnel [17].…”

Section: Introductionmentioning

confidence: 99%

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

Wang

Liu

et al. 2019

Advances in Civil Engineering

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Based on the field investigation and analysis, the mechanical characteristics of segment structure in shield tunnels are compared and analyzed under the circumstances of different concrete spalling region by the method of similarity model experiment. Through data analysis of acoustic emission, the results for displacement and internal force of shield tunnel segments are clarified on the segment lining, the influential rule of load bearing capacity is also determined, and the deformation and stress for the different concrete spalling region are described as well. The corresponding research results indicate that range for elastic bearing stage is enlarged while it is narrowed for plastic bearing stage, the convergence and deformation and the accumulated event numbers for acoustic emission on critical instability point are obviously increasing, and the process of damage and failure tends to be sudden for segment lining structure. The ultimate bearing capacity of the damaged segment lining obviously decreases due to regional concrete spalling; to be more specific, the reduction rate for ultimate bearing capacity becomes 6%, 6%, and 13%, respectively, when the range of concrete spalling reaches 45°, 60°, and 75°.

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Experimental investigation of the ultimate bearing capacity of deformed segmental tunnel linings strengthened by epoxy-bonded steel plates

Cited by 59 publications

References 6 publications

Thermal Behavior of Tunnel Segment Joints Exposed to Fire and Strengthening of Fire-damaged Joints with Concrete-filled Steel Tubes

Thermal Behavior of Tunnel Segment Joints Exposed to Fire and Strengthening of Fire-damaged Joints with Concrete-filled Steel Tubes

Deformation Characterisation and Distress Diagnosis of a Metro Shield Tunnel by Adjacent Constructions

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

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