Experiment and Application of NATM Tunnel Deformation Monitoring Based on 3D Laser Scanning

Hu, Da; Li, Yongsuo; Yang, Xiaolin; Liang, Xiaoqiang; Zhang, Ke-neng; Liang, Xiaodong

doi:10.1155/2023/3341788

Cited by 30 publications

(7 citation statements)

References 46 publications

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“…The reliability of the algorithm was verified through field experiments. Hu et al [ 41 ] processed 3D laser scanning point-cloud data using the Kriging filtering algorithm. The point-cloud data were extracted and analyzed through field monitoring of the test section, and the deformation data obtained from the test were compared with the measurement data obtained using the traditional method to verify the precision of the algorithm.…”

Section: Introductionmentioning

confidence: 99%

Full-Section Deformation Monitoring of High-Altitude Fault Tunnels Based on Three-Dimensional Laser Scanning Technology

Tan,

Tao,

et al. 2024

Sensors

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In traditional tunnel monitoring, the characteristic points of an object within a tunnel are measured to obtain information about the object. Considering the limitations of the traditional method in measuring the complex surface structure of tunnels, such as limited monitoring points, a long measurement period, and low precision, this study introduces an approach that uses three-dimensional (3D) laser scanning for monitoring tunnel cross-section deformation. Using this approach, the soft surrounding rock of a high-altitude ultralong tunnel was taken as the monitoring object. The test tunnel was first scanned using a 3D laser scanner, and the collected data were processed. The internal structural data of the tunnel were subsequently compared with its actual contour lines and the data of its primary branch and secondary lining on different dates. The results indicate that the arch roof of the tunnel tended to be stable within a certain time range when the positions of the primary branch and secondary lining were at different measuring points with different pile numbers. The deformation of the pile number on the left and right sides did not generally exceed 0.02 m, except at a few measuring points. A comparison between the actual cross section of the initial branch and that of the designed section showed that the actual elevation of the arch of the initial branch of the tunnel was greater than its designed elevation by no more than 0.3 m. Hence, through this study, a convenient and practical method is presented for monitoring deformation in complex curved tunnel structures.

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Section: Introductionmentioning

confidence: 99%

Full-Section Deformation Monitoring of High-Altitude Fault Tunnels Based on Three-Dimensional Laser Scanning Technology

Tan,

Tao,

et al. 2024

Sensors

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“…A significant portion of recent literature highlights the positive effect of newly developed technology on diverse engineering domains 1 – 5 . These developments include new approaches, devices, and software that assist experts towards facilitating data acquisition, simulation, and eventually solving complex engineering problems 6 – 10 . Taking image processing as an evident example of these sophisticated techniques, Jafarzadeh et al 11 used it along with experimental data to validate their analytical model for simulating flexible circular submerged mound motion in gravity waves.…”

Section: Introductionmentioning

confidence: 99%

Integrated machine learning for modeling bearing capacity of shallow foundations

Liu,

Liang

2024

Sci Rep

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Analyzing the stability of footings is a significant step in civil/geotechnical engineering projects. In this work, two novel predictive tools are suggested based on an artificial neural network (ANN) to analyze the bearing capacity of a footing installed on a two-layered soil mass. To this end, backtracking search algorithm (BSA) and equilibrium optimizer (EO) are employed to train the ANN for approximating the stability value (SV) of the system. After executing a set of finite element analyses, the settlement values lower/higher than 5 cm are considered to indicate the stability/failure of the system. The results demonstrated the efficiency of these algorithms in fulfilling the assigned task. In detail, the training error of the ANN (in terms of root mean square error—RMSE)) dropped from 0.3585 to 0.3165 (11.72%) and 0.2959 (17.46%) by applying the BSA and EO, respectively. Moreover, the prediction accuracy of the ANN climbed from 93.7 to 94.3% and 94.1% (in terms of area under the receiving operating characteristics curve—AUROC). A comparison between the elite complexities of these algorithms showed that the EO enjoys a larger accuracy, while BSA is a more time-effective optimizer. Lastly, an explicit mathematical formula is derived from the EO-ANN model to be conveniently used in predicting the SV.

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“…In numerical analysis, the Burger-creep viscoelastic CVISC model is used to study the long-term deformation of the existing tunnel [6]. In Reference [7], a two-stage analysis method based on the Tymoshenko beam model and the Kerr foundation model was proposed to estimate the response of the in-service tunnel, including the influence of the shear of the shield tunneling section and the reduction of the stiffness of the circumferential joints. Considering the circumferential joints, a new longitudinal deformation analysis method for shield tunnel is proposed [8].…”

Section: Introductionmentioning

confidence: 99%

Characterization of Shear Damage and Channel Reinforcement of Circumferential Joints between Shield Tunneling Segments Based on Numerical Simulation

Su,

Deng,

Yang

et al. 2024

Buildings

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Shield misalignment is a common problem in shield tunnels, which seriously affects the safety and durability of tunnels. However, at present, there is a lack of research on the influence of shield misalignment on the shear capacity of the circumferential joint structure, and the failure mechanism of the circumferential joint structure before and after reinforcement is not clear. Therefore, this paper simulates the influence of misalignment on the performance mechanism of segmented circumferential connection and the effect of channel reinforcement on the ABAQUS platform. The simulation results are compared with the full-scale test results, and the results show that the shear failure process of the circumferential joint can be divided into three stages under the condition of no reinforcement. In the first stage, the vertical load increases, but the misalignment between the shield tunneling sections is very small. In the second stage, the load almost does not increase, but the degree of misalignment increases. In the third stage, the load–displacement relationship is nonlinear, indicating that the bending bolt has been sheared. Under the condition of unreinforced, the bolt will form two plastic hinges when it fails. After reinforcing the channel, the removal of the bolt forms only one plastic hinge. After channel steel reinforcement, the boundary area between the channel steel web and the steel plate first reaches the ultimate tensile strength of the steel plate, and the failure mode becomes channel steel reinforcement failure. Under the same shear load, the misalignment of the circumferential joint reinforced with channel steel is reduced. In this paper, the misalignment relationship of shear load and the yield of the bending bolt obtained through numerical calculation is consistent with the conclusion of the full-scale test. However, the circumferential connection misalignment obtained via numerical calculation is relatively small. The yield position of the bending bolt is also in good agreement with the test results, and the bolt strain obtained through the test is relatively small.

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Experiment and Application of NATM Tunnel Deformation Monitoring Based on 3D Laser Scanning

Cited by 30 publications

References 46 publications

Full-Section Deformation Monitoring of High-Altitude Fault Tunnels Based on Three-Dimensional Laser Scanning Technology

Full-Section Deformation Monitoring of High-Altitude Fault Tunnels Based on Three-Dimensional Laser Scanning Technology

Integrated machine learning for modeling bearing capacity of shallow foundations

Characterization of Shear Damage and Channel Reinforcement of Circumferential Joints between Shield Tunneling Segments Based on Numerical Simulation

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