Propose of Tunnel Crack Index (Tci) as an Evaluation Method for Lining Concrete

Shigeta, Yasuteru; Tobita, T; Kamemura, Katsumi; Shinji, Masato; Yoshitake, Isamu; Nakagawa, Koji

doi:10.2208/jscejf.62.628

Cited by 8 publications

(10 citation statements)

References 4 publications

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“…But the evaluation standard was qualitative, and the results depended on the experience of engineer. As a solution of this problem, the tunnel lining crack index (TCI) was proposed to evaluate the severity of cracks quantitatively [16,17]. The conceptual diagram of TCI was shown in Figure 1.…”

Section: Research Backgroundmentioning

confidence: 99%

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Study on the Correlation of Vibration Properties and Crack Index in the Health Assessment of Tunnel Lining

Jiang

Masaya

et al. 2017

Shock and Vibration

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This paper examines the correlation of vibration properties and crack index of tunnel lining in evaluating risk of collapsing. The visual inspection method, which was widely used, was not reliable enough as the stability of tunnel lining was influenced by the voids and the cracks that were invisible. A new method for the health assessment of tunnel lining was proposed, which can evaluate the whole structural condition according to the vibration properties of tunnel lining. A series of field tests were conducted to evaluate the validity of this new method and to make a comparative analysis with the visual inspection test results. The resultant average spectrum (RAS) of tunnel lining was identified according to the acceleration data of ambient vibration test of Hidake Tunnel in Japan. The tunnel lining crack index (TCI) was also obtained by digital visual inspection test. The correlation between the vibration characteristics and the crack index of tunnel lining was confirmed. However, the voids and the cracks on the inside of the lining were neglected in visual inspection test, which could pose a serious threat to tunnel safety. The vibration measurements by seismometer are an effective way to evaluate the global stability of tunnel lining.

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Section: Research Backgroundmentioning

confidence: 99%

“…The concrete lining of spans 1, 49, 58, and 65 was located in the unhealthy area by both methods. Spans 12,16,35, and 42 were located in the healthy area by both methods. For these test points, the results by the two different methods were consistent with each other.…”

Section: Correlation Between the Crack Index And The Vibration Characmentioning

confidence: 99%

Study on the Correlation of Vibration Properties and Crack Index in the Health Assessment of Tunnel Lining

Jiang

Masaya

et al. 2017

Shock and Vibration

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“…The conceptual diagram of TCI [12] was shown in Figure 1. One span of the tunnel shown in the left side of the figure was spread out to a flat surface as shown in the right side.…”

Section: Concept Of Tunnel-lining Crack Indexmentioning

confidence: 99%

“…However, the evaluation standard was qualitative, and the results depended on the experience of different engineers. As a solution of this problem, the Tunnel-lining Crack Index (TCI) was proposed to quantitatively evaluate the severity of tunnel lining cracks [12]. It has been widely applied for the inspecting of surface defects of tunnels in Japan.…”

Section: Introductionmentioning

confidence: 99%

A New Health Assessment Index of Tunnel Lining Based on the Digital Inspection of Surface Cracks

Jiang

Wang

et al. 2017

Applied Sciences

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Abstract:The stability assessment of aged tunnel linings are mainly evaluated based on the visual inspection, and the Tunnel-lining Crack Index (TCI) is one of the most widely used tunnel lining health assessment indexes in Japan. However, the intersection and distribution of cracks, which could influence the stability of tunnel lining greatly, were not considered in TCI. A new method was proposed for the health assessment of tunnel lining, which evaluated the lining states according to the fractal dimension of cracks. Based on the machine vision-based method, the crack image could be extracted efficiently. The fractal dimension of lining cracks in one span could be obtained in a few minutes. A series of comparative tests and field tests were conducted to evaluate the validity of this new method. The comparative tests confirmed that fractal dimension was able to characterize the density, width, and distribution of cracks. The intersection of cracks, which would increase the risk of lining collapse, could also increase the fractal dimension. The fractal dimensions of tunnel lining cracks were obtained according to the digital inspection test of Hidake Tunnel in Japan for all the 65 spans. Moreover, the TCI was obtained through statistical methods. The correlation between fractal dimension and TCI of tunnel lining was studied. The significance of the new evaluation index is that it can identify the unusual spans of tunnel lining and provide a basis for further internal testing. As a complement to the conventional visual inspection method, the fractal dimension of the cracks is a promising health assessment index.

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“…Scholars from different countries have proposed different methods. Shigeta et al [3] of Yamaguchi University in Japan extracted two basic parameters of fracture width and length, and on this basis, introduced a new strike parameter; Xu Jieying et al [4] extracted three parameters of fracture area, concavity and compactness; Chiu et al [5] took mountain highway tunnels as an example, extracted the development of cracks in different directions within a certain time range as qualitative parameters, and took the crack development speed and crack length as quantitative parameters to clarify the relationship between slope deformation and tunnel service reliability; Wang Pingrang [6] established the safety grade evaluation factor of tunnel structure with the length and width of crack disease as the main index and the trend, distribution density and position of crack disease as the auxiliary index; Wu et al [7] of Nagasaki University introduced the concept of fractal dimension into the extraction of tunnel parameters, and proved that fractal dimension can describe the direction and complexity of tunnel cracks to a certain extent. Li Qingtong et al [8] took the binary image of the shield tunnel crack as the research object, and proposed a dynamic block method to calculate the length and maximum width of the crack disease, and used the difference box dimension method to calculate the fractal dimension of cracks, which can better describe the characteristics of crack distribution and strike.…”

Section: Introductionmentioning

confidence: 99%

Service reliability evaluation of highway tunnel based on digital image processing

et al. 2023

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China is gradually transitioning from the "tunnel construction exploration era" to the "tunnel high-quality construction and operation era", and the maintenance demand of highway tunnels has increased sharply. Therefore, there is an urgent need for an evaluation method to evaluate the service reliability of highway tunnels, so as to provide reference for tunnel maintenance personnel to carry out maintenance work. Taking highway tunnels as the research object, this paper extracts three parameters, including length, maximum width and fractal dimension, from the binary image of highway tunnel lining cracks. The standard for dividing the length of the highway tunnel section is 500m as the tunnel section, and a section disease sample space including multiple highway tunnels is constructed. The EM clustering algorithm was used to determine the number of graded grades of disease, and the relative Euclidean distance was used as the evaluation index to divide the safety grade of the tunnel into five grades: normal, degraded, inferior, deteriorated and hazardous. The partial least squares method is used to establish the lining service reliability evaluation formula and verify the residual of each sample point in the sample space. The smaller the average value of the residual, the better fitting effect of the established evaluation formula. The service reliability evaluation method proposed in this paper is applied to engineering practice and compared with the expert scoring method and the national standard method, which proves that the evaluation method in this paper has the advantages of strong visibility, simple evaluation method, and is conducive to engineering practice.

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Propose of Tunnel Crack Index (Tci) as an Evaluation Method for Lining Concrete

Cited by 8 publications

References 4 publications

Study on the Correlation of Vibration Properties and Crack Index in the Health Assessment of Tunnel Lining

Study on the Correlation of Vibration Properties and Crack Index in the Health Assessment of Tunnel Lining

A New Health Assessment Index of Tunnel Lining Based on the Digital Inspection of Surface Cracks

Service reliability evaluation of highway tunnel based on digital image processing

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