Automatic detection method of tunnel lining multi‐defects via an enhanced You Only Look Once network

Zhou, Zhong; Zhang, Junjie; Gong, Chenjie

doi:10.1111/mice.12836

Cited by 103 publications

(50 citation statements)

References 60 publications

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“…Given the failure mechanism of immersed tunnels, the key to the tunnel structure design lies in using accurate identification methods [18] and formulating effective prevention and control measures for standard joint failure modes. e shear key end angle, joint, and pipe segment connection should be optimized and strengthened.…”

Section: Damage and Failure Mechanism Of Tunnel And Design Key Pointsmentioning

confidence: 99%

Mechanical Characteristics of Variable Cross-Section Immersed Tunnels under Spatial Differential Settlement

Yang

Wang

Wei

et al. 2022

Advances in Civil Engineering

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This work establishes a fine model reflecting the characteristics of immersed tube structures to study the spatial mechanical characteristics of variable cross section immersed tunnels. Then, the mechanical behavior of the pipe segments under differential deformation is explored, based on which we propose a formula for estimating the shear key force and analyze the corresponding failure mechanism and failure mode. Thus, the critical points of the pipe segment design are specified. The results show that, first, the variable cross section segment bears more sectional internal force (over 47%) than the uniform cross section segment in actual cases, which should be fully considered in practical reinforcement design. Bearing deformation alternatively occurs at different shear keys, implying an apparent spatial stiffness matching problem. Second, the pipe segments show overall settlement under longitudinal bending, failing to satisfy the assumption of deformed plane sections. The force on the shear keys varies with the quadratic function of the longitudinal bending degree, and the dislocation magnitude has a positive near-linear relationship with the bending degree. Third, when subjected to torsion, the shear keys of the weak sidewalls are sheared to resist torsion. Then, this force is laterally transferred to the top and bottom plates and jointly shared by the adjacent shear keys, explaining why shear is adjusted with structural deformation. Fourth, under the action of spatial differential deformation, the shear force is mainly undertaken by the vertical shear keys. When the structure is subjected to bending, compression and shear failure occur at the end angle of the middle wall shear key, and its root junction experiences tension and shear failure. When subjected to longitudinal torsion, the local tension and shear failure at the root of the shear key on the soft subgrade side cause a joint failure. Finally, based on the bearing characteristics, failure mechanism, and failure mode of variable cross section immersed tunnels, the idea of strengthening immersed tube structures is put forward, which can guide similar engineers.

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Section: Damage and Failure Mechanism Of Tunnel And Design Key Pointsmentioning

confidence: 99%

Mechanical Characteristics of Variable Cross-Section Immersed Tunnels under Spatial Differential Settlement

Yang

Wang

Wei

et al. 2022

Advances in Civil Engineering

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“…According to projections from the United Nations [5], if there is no change in how the construction sector operates, these impacts will be exacerbated by the scarcity of material resources, land use changes, and growing populations. In order to reduce the impacts of construction, the incorporation of waste as a raw material [6,7] or proposals to improve the mechanical properties of the material or the maintenance of buildings [8,9] are essential.…”

Section: Introductionmentioning

confidence: 99%

Assessing Durability Properties and Economic Potential of Shellfish Aquaculture Waste in the Construction Industry: A Circular Economy Perspective

et al. 2022

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The construction industry’s high demand for natural resources, combined with the waste generated by agriculture, creates an opportunity for the circular economy. This experiment used the CaCO3 found in scallop shells as an ingredient for the manufacture of fire-resistant materials, replacing gypsum in compositions of 40% and 50% by weight. The mechanical compressive strength was estimated for both freeze-thaw cycles and acid and sulfate attacks. The cost of disposing of scallop shell waste in landfills, savings from substitution, and the payback period relative to the amount of production were determined. The compressive strength of the materials decreased by 80% when subjected to freeze-thaw cycles and sulfate attack. In response to acid attack, they showed a 100% increase in strength during the first three weeks and a decrease thereafter. The savings amounted to $46.36 (22.4%) for 40% replacement and $58.93 (28.4%) for 50%. Respectively, return on investment is achieved at 800- and 630-per-metric ton produced. The difference between the costs of waste disposal (in aquaculture) and the potential savings from using CaCO3 as a raw material (in construction) creates an opportunity for commercialization between the two industries, serves as a reference for decision-makers, and complies with circular economy principles, reducing both inputs of raw materials and outputs of waste.

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“…Actually, proximity detection can be referred to as obstacle recognition as well. If any vehicle/infrastructure in the vicinity can be inspected in advance, and the warning signals can be sent out accordingly, the successful rate of collision avoidance can be improved, and the false alarm problems can be also alleviated [ 5 , 6 ]. Decision-making subsystems consolidate the information obtained from the proximity detection subsystem to determine whether there is an imminent hazard.…”

Section: Introductionmentioning

confidence: 99%

Survey of Collision Avoidance Systems for Underground Mines: Sensing Protocols

Qian

Zhao

et al. 2022

Sensors

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With the growing number of unintentional interactions occurring in underground mines, Collision Avoidance System (CAS) establishment and maintenance has become an urgent need for mining industries to enhance their risk profile and improve construction safety. Usually, most collision accidents can be divided into three different categories in line with the involved participants and infrastructure condition. The accidents pose a great risk of financial cost to mining companies and even cause casualties. In detail, this paper presents an intensive study survey of positioning techniques, including ranging algorithms, to accommodate the demands of various proximity sensors and improve the capability of situational awareness. Then, we exploit the importance of the communication system, prevalent low-power wide-area technologies and related communication protocols. The effectiveness of communication systems decides and facilitates the success of the final integrated system that can be used to fundamentally address the problem of collision avoidance. For the purpose of collaboration between communication systems and other executive departments, a series of systematic comparisons of pertinent technologies and algorithms is given near the end, followed by a brief discussion on the best choice among these options. In the proposed solution, the overall end-to-end delay can be minimised to a few nanoseconds and the localisation accuracy can achieve centimetre level when operating in the range of 100 m.

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Automatic detection method of tunnel lining multi‐defects via an enhanced You Only Look Once network

Cited by 103 publications

References 60 publications

Mechanical Characteristics of Variable Cross-Section Immersed Tunnels under Spatial Differential Settlement

Mechanical Characteristics of Variable Cross-Section Immersed Tunnels under Spatial Differential Settlement

Assessing Durability Properties and Economic Potential of Shellfish Aquaculture Waste in the Construction Industry: A Circular Economy Perspective

Survey of Collision Avoidance Systems for Underground Mines: Sensing Protocols

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