Centrifugal model tests on the structural response of the shield tunnel when constructing cross passages by mechanical methods

Lu, Ping; Yuan, Dajun; Jin, Dalong; Luo, Weiping; Liu, Minggao

doi:10.1016/j.tust.2022.104621

Cited by 14 publications

(4 citation statements)

References 17 publications

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“…Therefore, how to accurately predict and control the tunneling parameters has always been the research focus in the field of shield tunnel construction technology (Pan et al, 2022). At present, many scholars have studied the variation laws and theoretical calculations of cutter head torque, shield thrust, grouting pressure, tunneling speed and other parameters under different geological conditions during EPB shield tunneling, and established mathematical and physical models to predict tunneling parameters according to Hooke's law (Jie et al, 2017;Wei et al, 2017;Yang et al, 2017;Zhao et al, 2017;Boukhari, 2020;Cao et al, 2020;Gao et al, 2020;Al-Habahbeh, 2022;Lu et al, 2022;Lyu et al, 2022). Although these models can reflect the analytical relationship between tunneling parameters, shield tunneling is a complex and changing process, and the stratum it crosses is actually a non-uniform and discontinuous non-linear elastomer.…”

Section: Open Accessmentioning

confidence: 99%

Prediction method of shield tunneling parameters in pebble stratum formed by weathered granite and quartzite

Wang

Zhao

et al. 2023

Front. Earth Sci.

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The pebble formation formed by weathered quartzite and granite is usually of high strength, strong permeability and poor self stability, which brings great difficulties to shield tunneling. It is necessary to adjust the tunneling parameters at any time to prevent the consequences of instability of the tunnel face, loss of stratum and surface settlement caused by the imbalance of the soil bin pressure. GA algorithm is embedded into PSO algorithm for parameter optimization, and grey theory is combined to establish the prediction model of soil chamber pressure based on grey least square support vector machine, which can solve the problem of difficult control of tunneling parameters in pebble stratum formed by weathered quartzite and granite. Research indicates: GA-PSO-GLSSVM chamber Earth pressure prediction model enhances the EPB chamber Earth pressure forecast accuracy in complicated strata by integrating the global search capability of the GA algorithm, the quick convergence of the PSO algorithm, and the anti-disturbance capability of the GM model. The GA-PSO-GLSSVM model has high goodness-of-fit and accuracy compared with other prediction models. This model can successfully prevent the a series of undesirable consequences such as destabilization of the palm surface, missing strata and settlement due to ground surface due to pressure imbalance in the soil chamber pressure. The research results can provide reference for EPB shield tunneling parameter control in Grade V surrounding rock.

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Section: Open Accessmentioning

confidence: 99%

Prediction method of shield tunneling parameters in pebble stratum formed by weathered granite and quartzite

Wang

Zhao

et al. 2023

Front. Earth Sci.

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“…Liu et al [5] discovered that significant opening and dislocation along joints can result in the development of concrete cracking and water leakage through case study. Lu et al [6] measured and analysed the dislocation caused by construction load through a centrifuge model test of the shield tunnel structure. Shiba et al [7] proposed a typical theoretical model known as the equivalent axial stiffness model.…”

Section: Introductionmentioning

confidence: 99%

“…Lu et al. [6] measured and analysed the dislocation caused by construction load through a centrifuge model test of the shield tunnel structure. Shiba et al.…”

Section: Introductionmentioning

confidence: 99%

Machine learning-based identification of segment joint failure in underground tunnels

Jin

Yan

et al. 2023

Phil. Trans. R. Soc. A.

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Shield tunnels that reside deep within soft soil are subject to longitudinal differential settlement and structural deformation during long-term operation. Longitudinal deformation can be classified into two modes: bending and dislocation deformation. The failure of bolts and engineering treatment techniques differ between these two modes. Therefore, it is imperative to accurately identify the tunnel's longitudinal deformation mode to determine the validity of the segment joint and implement appropriate engineering treatment. Traditional methods for detecting dislocation or opening suffer from high labour costs. To address this issue, this study presents an innovative identification method using a back-propagation neural network (BPNN) to detect segment joint failure in underground tunnels. First, this study collects the tunnel settlement curves of various subways located in the East China soft soil area, and it calculates tunnel settlement-dislocation and settlement-opening datasets using the equivalent axial stiffness model. A corresponding BPNN regression model is subsequently established, and the new settlement curve is the input to this regression model to predict the dislocation and opening, thereby determining the validity of the segment joint. The efficiency of this method is demonstrated through its successful application to the Hangzhou Metro Tunnel. This article is part of the theme issue 'Artificial intelligence in failure analysis of transportation infrastructure and materials'.

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“…Many field tests and model tests, especially centrifuge model tests, were carried out under various conditions [25][26][27]. By creating equivalent stress levels as the full-scale prototype in a scaled-down model, centrifuge model testing offers a reliable means of simulating the response of tunnel structures under various external loads and evaluating their stress and deformation.…”

Section: Introductionmentioning

confidence: 99%

Centrifuge Model Tests on the Effects of Navigable Channel Excavation and Seawall Construction on a Subsea Shield Tunnel Below

et al. 2023

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As subsea shield tunnels are becoming increasingly popular, especially in coastal or river cities, the complicated construction environment poses multiple challenges that need to be addressed to ensure their safety and reliable operation. This study presents the results of centrifuge model tests that aimed to examine the impacts of navigable channel excavation and seawall construction on the deformation and forces acting on a subsea shield tunnel. The symmetry of the tunnel structure, as well as the loading and unloading effects from channel excavation and seawall construction in this engineering project, allow for the simplification of the problem. The centrifuge test model included a novel device to simulate the unloading action of channel excavation and the loading impact from seawall construction. The structural response of the tunnel was monitored using an innovative solution, and various parameters such as vertical displacement, opening of the circumferential joint, circumferential bending moment, and longitudinal stress were analyzed. The results reveal that both channel excavation and seawall construction have significant effects on the stress and deformation of the pre-existing tunnel. While the excavation of the navigable channel reduces the load on the tunnel from the overlying strata, resulting in uplifts in the tunnel structure around the excavation area, and the construction of the seawall causes settlement of the tunnel near the loading zone. The unloading effect of channel excavation leads to the opening tendency of the tunnel circumferential joints, while the loading effect of seawall construction has the opposite effect on the tunnel circumferential joints. The excavation of the channel induces tensile stresses on the tunnel crown around the loading zone, while the seawall construction causes significant compressive stresses on the tunnel crown around the loading zone. It is crucial to prioritize safety and ensure the tunnel’s load-bearing capacity through careful design and construction considerations in practical engineering. The study can guide the design and construction of future projects and help minimize the risk of damage to pre-existing structures.

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Centrifugal model tests on the structural response of the shield tunnel when constructing cross passages by mechanical methods

Cited by 14 publications

References 17 publications

Prediction method of shield tunneling parameters in pebble stratum formed by weathered granite and quartzite

Prediction method of shield tunneling parameters in pebble stratum formed by weathered granite and quartzite

Machine learning-based identification of segment joint failure in underground tunnels

Centrifuge Model Tests on the Effects of Navigable Channel Excavation and Seawall Construction on a Subsea Shield Tunnel Below

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