Numerical simulation of ground movement induced by water and sand gushing in subway through fault based on DEM-CFD

Chen, Fan; Wang, Yingchao; Jiang, Wen; Zheng, Shunhua

doi:10.1016/j.compgeo.2021.104282

Cited by 22 publications

(5 citation statements)

References 26 publications

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“…In the existing electrified railroad operation lines, according to the statistics of various accidents in the past years, the vehicle equipment failures caused by pantographs account for a relatively large proportion. Pantograph is an important part of the vehicle but also is in direct contact with the contact network part, in the vehicle high-speed travel by wear and tear, and has a high probability of failure [4][5][6]. Rail vehicle power supply and operation disruptions have a significant impact on line transportation order and are a major issue for rail cars.…”

Section: Introductionmentioning

confidence: 99%

Design of Faster R-CNN-Based Fault Detection Method for Subway Vehicles

Yao

2022

Computational and Mathematical Methods in Medicine

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A substantial amount of maintenance and fault data is not properly utilized in the daily maintenance of pantographs in urban metro cars. Pantograph fault analysis can begin with three factors: the external environment, internal flaws, and joint behavior. Based on the analysis of pantograph fault types, corresponding measures are proposed in terms of pantograph fault handling and maintenance strategies, in order to provide safety guarantee for the safe and effective realization of rail transit vehicle speed-up and also provide reference for the maintenance and overhaul of pantographs. For the problem of planned maintenance no longer meeting current pantograph maintenance requirements, a defect diagnosis system based on a combination of faster R-CNN neural networks is presented. The pantograph image features are extracted by introducing an alternative to the original feature extraction module that can extract deep-level image features and achieve feature reuse, and the data transformation operations such as image rotation and enhancement are used to expand the sample set in the experiment to enhance the detection effect. The simulation results demonstrate that the diagnosis procedure is quick and accurate.

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Section: Introductionmentioning

confidence: 99%

Design of Faster R-CNN-Based Fault Detection Method for Subway Vehicles

Yao

2022

Computational and Mathematical Methods in Medicine

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“…Among them, the prediction of the duration and scope of ground subsidence is of great significance for the prevention and control of actual engineering disasters. Some numerical methods were used to explore the ground collapse and formation failure modes under different strata [28][29].…”

Section: Introductionmentioning

confidence: 99%

“…The development and validation of theoretical models in both fields require necessary data from on-site or laboratory experiments. Model experiments held an advantage in reproducing the process of ground collapse triggered by shield tunnelling instability [32][33]. Currently, the model experiment research on the instability of shield tunnelling face in saturated sand mainly uses pre-installed tunnels with centrifuges or retractable face shields [34][35][36][37].…”

Section: Introductionmentioning

confidence: 99%

Unstable collapse analysis of SPBS in saturated sand based on model experiment

Li,

Wu,

Chen

et al. 2024

Preprint

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The instability of the tunnel face during shield tunnelling can lead to extensive surface subsidence in saturated sand, potentially leading to ground collapse accidents that pose a serious threat to the safety of surface infrastructure. In order to study the mechanism of ground collapse induced by face instability, a laboratory-scale slurry pressure balance shield (SPBS) machine system is employed to simulate the entire process of tunnelling. The soil pressure, pore water pressure, and surface subsidence response during unstable are revealed through multi-field monitoring. The morphological evolution characteristics of collapse pits are analyzed using 3D scanning technology. The experimental results indicate that: (1) The key to stable tunnelling is to balance the pressure in slurry chamber with tunnelling speed, which ensures the formation of filter cake in front of the cutterhead. (2) The torque of the cutterhead, soil pressure, and surface subsidence will respond significantly and synchronously when the tunnel face is unstable, whereas the soil and water pressures are relatively less noticeable. (3) Continuous tunnelling results in a gentler angle of repose and a wider range of collapse of the collapsed pit in the longitudinal direction. (4) The formula for predicting the duration of collapse is proposed which integrates the evolution patterns of the collapse pit effectively and has been well-validated by comparison with these experimental results. The study provides a reference for the safe construction of tunnel engineering in saturated sand.

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“…For the equivalent elastic modulus of composites, the Voigt model and Reuss model are most commonly used. However, the equivalent modulus of elasticity for composites is mainly applied to metals and composite materials and has rarely been used in geotechnical engineering [ 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 ].…”

Section: Introductionmentioning

confidence: 99%

Constitutive Model for Grouted Rock Mass by Macro-Meso Damage

et al. 2023

Self Cite

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Rock fractures have a significant impact on the stability of geotechnical engineering, and grouting is currently the most commonly used reinforcement method to address this issue. To ensure the stability of grouted rock mass, it is necessary to study its deformation law and mechanical properties. In this study, theoretical analyses and laboratory experiments were conducted, and the fracture width, Weibull model and effective bearing area were introduced to improve the applicability and accuracy of the original damage constitutive model. Moreover, the constitutive model of grouted rock mass was derived by combining it with the mixing law of composite materials. The main conclusions are summarized as follows: (1) Based on macroscopic damage tensor theory, the fracture width parameter was introduced, which effectively described the variation law of macroscopic damage with fracture width to improve the accuracy of the original damage constitutive model. (2) The effective bearing area was used to optimize the original Weibull model to match the stress-strain curve of the rock mass with fractures. (3) The grouting-reinforced rock mass was considered to be a composite material, the original equivalent elastic modulus model was improved by combining macroscopic damage with the Reuss model, and the constitutive damage model of the grouted rock mass was deduced.

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Numerical simulation of ground movement induced by water and sand gushing in subway through fault based on DEM-CFD

Cited by 22 publications

References 26 publications

Design of Faster R-CNN-Based Fault Detection Method for Subway Vehicles

Design of Faster R-CNN-Based Fault Detection Method for Subway Vehicles

Unstable collapse analysis of SPBS in saturated sand based on model experiment

Constitutive Model for Grouted Rock Mass by Macro-Meso Damage

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