Report to ITA Working Group on Maintenance and Repair of underground structures: State-of-the-art of non-destructive testing methods for determining the state of a tunnel lining

Haack, Adriana; Schreyer, Jan; Jackel, G.

doi:10.1016/0886-7798(95)00030-3

Cited by 35 publications

(13 citation statements)

References 3 publications

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“…If there is a boundary invasion, the equipment will sound an alarm. Because of the limitations of the equipment itself, this method is prone to equipment damage or providing an insufficient measurement range [ 5 ]. In the noncontact detection method, the total station, measuring robot [ 6 , 7 ], laser profiler, three-dimensional laser scanner, and other equipment are often used.…”

Section: Introductionmentioning

confidence: 99%

Deformation Detection Method of Mine Tunnel Based on Mobile Detection System

Sun

Zhong

et al. 2020

Sensors

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Subway structure safety detection is an important method to ensure the safe operation of trains. Efficient, high-precision, and automatic tunnel clearance detection is the key to ensure safe operations. This study introduces a mobile tunnel scanning system that integrates a scanner, an inertial measurement unit (IMU), and a rail car. Global Navigation Satellite System (GNSS) time and system hardware calibration are used to synchronize time and space information of the system; the attitude and speed are corrected using the control points from the tunnel to improve the accuracy of absolute positioning. The section coordinate system is converted using the control points and system calibration parameters to complete the tunnel clearance inspection, and the distance between the nearest point of the section and the clear height of the vault is given. Taking Fengxi Road’s Bashan tunnel section of Chongqing Metro Line 5 as an example, the overall system accuracy was tested. The accuracy of chord line measurements was within 1 mm, the internal coincidence accuracy of repeated measurements of the vault clear height was 1.1 mm, the internal coincidence accuracy of repeated measurements of the closest gauge point was 4.8 mm, and the system calibration accuracy was approximately 2 mm. Compared with the existing scheme, the system combines absolute measurement and relative measurement mode to judge the structural safety of tunnel section from multiple angles, high precision, and high efficiency.

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Section: Introductionmentioning

confidence: 99%

Deformation Detection Method of Mine Tunnel Based on Mobile Detection System

Sun

Zhong

et al. 2020

Sensors

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“…Hence, timely and effective condition monitoring during construction and operation of the shield tunnel is essential ensuring the safety and preventing property losses. Presently, methods that have been used to monitor the deformation of the shield tunnel include automatic total station, ground‐penetrating radar, close‐range automated monitoring technologies, and conventional direct measurement methods . The automatic total station documents the overall geometric deformations of a tunnel .…”

Section: Introductionmentioning

confidence: 99%

Monitoring the behavior of segment joints in a shield tunnel using distributed fiber optic sensors

Wang

Shi

Wei³

et al. 2017

Struct Control Health Monit

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SummaryShield tunneling is a popular tunnel construction technique for its efficiency and speed. However, uncertainties associated with site soil conditions, past loading histories and analytical modeling, can result in performance issues. To monitor shield tunnels and ensure performance and safety, fiber optic sensing technique is proposed. Based on Brillouin optical frequency domain analysis, the technique can monitor the opening and closing of segmental joints in shield tunnels with high sensitivity. To determine tunnel lining segment displacement, different fixed-point spacings have been tested in the lab. The test results show that the difference in fixed-point distances had no impact on the test accuracy and the sensing cable with 0.9-mm polyurethane sheath coater has the best performance. For demonstration, the Brillouin optical frequency domain analysis-based monitoring technique is applied to the Suzhou Metro Line 1 tunnel for tunnel lining segment joint monitoring. The technique detected minor deformation of the segment joints in tunnels in operation and located leakages within the tunnel. The technique further identified that the minor deformations of the segment joints and track bed expansion were closely associated with temperature variations.

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“…For this purpose, infrared thermography is powerful technique that is particularly suitable for detailed inspection. Haack et al [3] point out that thermal infrared imaging is useful for promptly detecting damaged and humid sites in tunnel construction, and the technique works better than other non-destructive techniques. Sakagami and Kubo [4] develop a method using an infrared thermalgraphic device with a heating system that can identify defects in reinforced concrete (RC) objects.…”

Section: Introductionmentioning

confidence: 99%

Visualization of the thermal environments of RC and composite-wall constructions

Liu¹

2011

WIT Transactions on Ecology and the Environment

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In recent years, the promotion of environmental conservation, energy-saving methods and carbon reduction has led to the implementation of a number of new energy codes in many countries to increase building efficiency. The ultimate goal is to create a comfortable and healthier living environment and reduce issues arising from climate-related factors. The aims of this study are to discuss several cost-effective methods that can reduce energy consumption and further improve the thermal environment of buildings in a subtropical country. This research utilizes a portable infrared thermography device to closely inspect and analyze the outdoor and indoor heat-environments of buildings built with reinforced concrete (RC) or of a composite-wall construction through visualization and comparison of thermographic images. By conducting cross-comparison and analysis, various dominant factors in the heat-environment are identified. This paper compares the effect of two different construction methods on the thermal environment and identifies the benefits of using proper materials with a low heat capacity to improve the energy-saving performance. The impacts of the two construction methods on carbon reduction and the heat island effect are also explored. The results of this study can serve as a useful reference and could form the basis of recommendations for building restoration or construction.

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Report to ITA Working Group on Maintenance and Repair of underground structures: State-of-the-art of non-destructive testing methods for determining the state of a tunnel lining

Cited by 35 publications

References 3 publications

Deformation Detection Method of Mine Tunnel Based on Mobile Detection System

Deformation Detection Method of Mine Tunnel Based on Mobile Detection System

Monitoring the behavior of segment joints in a shield tunnel using distributed fiber optic sensors

Visualization of the thermal environments of RC and composite-wall constructions

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