Evaluation of spalling of concrete pieces from tunnel lining employing joint shear model

Tsuno, Kiwamu; Kishida, Kiyoshi

doi:10.1016/j.tust.2020.103456

Cited by 12 publications

(4 citation statements)

References 17 publications

(20 reference statements)

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“…Te reaction of isocyanate with amines is part of the gradual addition and polymerization of hydrogen transfer, which is caused by the nucleophilic center of the amine attacking the positive carbon ions of the isocyanate group [18]. Te hydrogen atoms in the active hydrogen compound are transferred to the N atoms in the -NCO group, and the remaining groups and carbonyl C atoms are combined to form a urea group, the essence of which is the reaction of the semi-prepolymer with the amino polyether and amine chain extender [19]. Due to the high activity of amino polyether and the alkalinity of the N atom, the reaction does not require a catalyst and can be cured and formed in a very short time.…”

Section: Application Status Of Polyurea Spray Film Materialsmentioning

confidence: 99%

Exploration of Tunnel Lining Falling Block Remediation Using Polyurea Material

Yang

Yuan

Wang

et al. 2023

Mathematical Problems in Engineering

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Tunnel lining falling blocks can cause great threats to traffic safety, resulting in traffic interruptions or speed limits and endangering operational safety. Traditional lining disease remediation measures have low efficiency and high costs and are time consuming. Combining the research methods used in the literature, indoor testing, and model experiments, a very normal material, namely, polyurea spray film material, is proposed as a means by which to remediate the lining falling block disease in tunnels. A 1 : 1 tunnel lining structure model was established at the site, and four experimental conditions were tested. The experiments revealed that the tensile stress was less than the tensile strength and that no tensile fracture occurred in the polyurea spray film material under the joint action of the block’s self-weight and aerodynamic loads. Factors such as side seam treatment, surface sanding, and spray temperature may influence the bond strength of the polyurea spray film material. In order to remediate the issue of lining blocks falling, we recommended increasing the bond strength between the spray film material and the concrete or increasing the thickness of the polyurea spray film material.

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Section: Application Status Of Polyurea Spray Film Materialsmentioning

confidence: 99%

Exploration of Tunnel Lining Falling Block Remediation Using Polyurea Material

Yang

Yuan

Wang

et al. 2023

Mathematical Problems in Engineering

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“…Mountain tunnels are extensively used in mountainous regions due to their numerous advantages, such as the ability to address geographical and elevation challenges, enhance linear connectivity, reduce travel distances, and improve operational efficiency (Ding et al, 2022;Wang et al, 2022). However, long-term service of highway tunnels often gives rise to various issues, including water leakage (Lin, 2014;Hawley and Gräbe, 2022), lining cracks (Chang et al, 2021;Yike and Yu, 2021), concrete spalling (Kiwamu and Kiyoshi, 2020;Ciro and Isidoro, 2022), reinforcement corrosion (GongHe et al, 2017), and other diseases. These problems severely compromise the structural mechanical properties of the tunnels and even result in tunnel collapse (Zhang et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Research on the dismantling of double-arch tunnel after long-term service—the case study of Huangmeishan Tunnel demolition project

Kou,

Li,

Xie

et al. 2023

Front. Earth Sci.

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Mountain tunnel structures are subject to a variety of diseases with increasing service life. Earlier tunnels may need to be demolished and expanded because of the poor serving capacity. But few studies of tunnel demolition projects are available. Based on the demolition project of Huangmeishan Tunnel, this paper discusses the demolition scheme of the double-arch tunnel, calculates the stability of the slope, and investigates the defects and material performance in the tunnel. The water leakage in the tunnel mainly occurred at the mid-partition wall and the drainage pipe was clogged severely. The largest width of the crack detected is 15 mm. Material performance tests indicated that the concrete material strength exceeded the design values. In the loading test, the largest displacements of the tunnel arch and haunch were 1.73 and 1.32 mm, which verified the safety of heavy vehicles in construction. Finally, suggestions are given to avoid similar phenomena in other tunnels during the design, construction, and operation phase. The novelty of this study lies in its comprehensive analysis of a tunnel demolition project. The findings of this study contribute to enhancing the knowledge and understanding of tunnel demolition and support the safe and efficient execution of future demolition projects.

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“…A standard for the determination of the effect of the tapping sound on the damage state in the concrete is not presented. 13 Researchers have been studying on how to use tapping sound data to determine the presence of defects in concrete. For example, we selected three fundamental feature values of the sound pressure-time history, such as amplitude ratio, duration of oscillation, and vibration frequency and used them to investigate the diagnostic accuracy of the presence of defects inside concrete.…”

Section: Introductionmentioning

confidence: 99%

“…A standard for the determination of the effect of the tapping sound on the damage state in the concrete is not presented. 13…”

Section: Introductionmentioning

confidence: 99%

Basic research on usefulness of convolutional autoencoders in detecting defects in concrete using hammering sound

Sonoda

Yin

2022

Structural Health Monitoring

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Because hammering sound tests are inexpensive and can be performed easily, they are commonly used as an inspection method for examining the presence of defect areas (voids or peelings) in aged concrete structures. However, the evaluation of the health of concrete using hammering sounds depends on the subjective experience of the inspector. Therefore, there is a demand to develop a highly reliable and objective diagnostic method that is accurate and efficient. In this study, we used a convolutional autoencoder (CAE) to develop a diagnostic method that could assist the inspectors with quantitative diagnostic results of tapping sound when detecting defect areas in concrete. In particular, we verified the anomaly detection accuracy of hammering sound data of actual bridges that have deteriorated over time using the proposed CAE model.

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Evaluation of spalling of concrete pieces from tunnel lining employing joint shear model

Cited by 12 publications

References 17 publications

Exploration of Tunnel Lining Falling Block Remediation Using Polyurea Material

Exploration of Tunnel Lining Falling Block Remediation Using Polyurea Material

Research on the dismantling of double-arch tunnel after long-term service—the case study of Huangmeishan Tunnel demolition project

Basic research on usefulness of convolutional autoencoders in detecting defects in concrete using hammering sound

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