Stress waves in half-space due to moving train loads by 2.5D finite/infinite element approach

Yang, Y.B.; Liu, S.J.; Li, Q.M.; Ge, Pengbin

doi:10.1016/j.soildyn.2019.105714

Cited by 11 publications

(4 citation statements)

References 22 publications

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“…Figures [16][17][18] show the additional earth pressure at different depths under the 10 Hz excitation. Here, the additional earth pressure implies the difference in earth pressure before and after the application of the excitation load.…”

Section: Dynamic Response Of Earth Pressurementioning

confidence: 99%

“…The model results helped reveal the dynamic response of monolithic and segmented tunnels under the complied action of active ground fissures and traffic loads. Yang et al [16,17] established a tunnel-ground fissure-stratum interaction model with different lining types to investigate the basic characteristics of soil vibration adjacent to the ground fissure, and the influence of the size and shape of the tunnel section on the vibration response. Yang et al [18] analyzed the dynamic response among the ground fissure, subway tunnel, and surrounding rock under subway vibration load through the physical model test under the condition that the ground fissure and the shield tunnel were orthogonal.…”

Section: Introductionmentioning

confidence: 99%

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Model Test on Effect of Ground Fissure on the Behavior of Oblique Two-Section Subway Tunnel

Liu

Yan

et al. 2022

Applied Sciences

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The dynamic interaction between the ground fissure and an oblique two-section horseshoe-shaped subway tunnel under the subway dynamic load was investigated based on a series of model tests in this study. The results indicated that the subway subway-induced vibration attenuated in different degrees when propagating in the directions in the soil layer, while the ground fissure had an attenuation effect on subway vibration. Furthermore, the vibration of the soil layer below the tunnel near the ground fissure was stronger than that of the upper soil layer, and the vibration response at the tunnel bottom was stronger than that of the arch waist and the tunnel crown. The additional contact pressure between the tunnel bottom and the soil was relatively large when the ground fissure was not active, while the additional strain at the top and bottom of the tunnel caused by the excitation was small. Moreover, when the hanging wall of the ground fissure descended, the additional contact pressure at the tunnel crown in the hanging wall and the tunnel bottom in the footwall significantly increased, and a negative additional stain was identified at those two positions. Meanwhile, a positive additional stain was identified at the tunnel crown in the footwall and the tunnel crown in the hanging wall, increasing with the descent of the hanging wall.

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Section: Dynamic Response Of Earth Pressurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Model Test on Effect of Ground Fissure on the Behavior of Oblique Two-Section Subway Tunnel

Liu

Yan

et al. 2022

Applied Sciences

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“…Though some progress had been made in the dynamic stress accumulation of subgrade soil under cyclic loading, Yang et al [26] conducted a field test and numerical simulation for the spatial distribution and accumulative effect of dynamic stress. The field monitoring tests and model simulation recorded the relationship between dynamic stress accumulation in subgrade soil and the number of loading cycles.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Factors Affecting the Performance of Fiber-Reinforced Subgrade Soil Characteristics Under Cyclic Loading

Aneke,

Hanandeh,

Kalumba

2023

Civ Eng J

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This study is focused on evaluating the factors affecting the performance of fiber-reinforced subgrade under cyclic loading. To achieve the objectives of this study, a series of dynamic triaxial (DT) tests was performed, and the following parameters, such as resilient modulus (MR), number of loading cycles (N), cyclic stress (CS), resilient strain (RS), and stress-strain hysteresis response of both the reinforced and unreinforced subgrades were evaluated. Subsequently, a series of scanning electron microscope (SEM) tests was conducted to track the fiber-soil interfacial bonding after the completion of DT test. The results indicated that N and CS triggered an appreciable decrease in MR with significantly high RS deformation for the unreinforced subgrade. However, reversed responses were noted upon the inclusion of sisal fiber due to fiber-soil adhesion and a high ductility response was portrayed by the reinforced subgrades. A reversed response was significant upon 0.25% and 0.5% fiber inclusion, beyond which the CS resistance slightly decreased. The stress-strain hysteresis loop was observed to increase as the axial strain increased proportionally with an increase in fiber contents, thus causing a significant increase in energy absorption in specimens. The SEM micrograph showed tightly knitted fiber-soil adhesion after the DT test. This study indicated that the reinforced subgrade sustained the CS, N, and improved energy absorption capacity, and MRupon fiber inclusion. Doi: 10.28991/CEJ-2023-09-08-015 Full Text: PDF

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“…e maximum RSL, acting as the main parameter in the design and construction of railway tracks [1], needs to be calculated from the maximum axle load and the LSR. Moreover, recently increasing investigations have been devoted to reducing the model scale (for example, using 2.5D numerical methods) of the dynamic response prediction of railway tunnels [2] and the environment [3][4][5][6][7]. However, these models still include rail and fastenings, partly repeating with train-track coupling models.…”

Section: Introductionmentioning

confidence: 99%

Multi‐Factor Modeling Method of the Load Sharing Ratio under Moving Train Loads

Liu

Zhang

Jin

et al. 2021

Shock and Vibration

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In railway engineering, the load sharing ratio (LSR) is the ratio of the rail seat load (RSL) to the axle load, which is affected by many factors. The LSR can be used in the design and analysis of railway track structures as well as in the research of predicting the dynamic influence of railway tunnels and the environment. The “static loading method” commonly used to study the LSR does not conform to reality; using it, it is difficult to obtain a complete LSR curve, limiting its application. Besides, there is currently a lack of LSR prediction methods considering the impact of multiple factors. Therefore, this paper proposes a “moving loading method” for investigating the LSR under moving train excitation, verified to be rational by comparing with the experimental results. At the same time, a procedure for establishing the LSR multi-factor prediction model is put forward, namely, we (1) determine the LSR function form and the fitting algorithm; (2) perform parameter sensitivity analysis to determine the main influencing parameters of the LSR function; and (3) design a quadratic regression orthogonal test to obtain the prediction formula of the LSR function coefficients. Once establishing the prediction model for a type of train-track system, the LSR of similar systems can be calculated by adjusting the main parameters of the model. Shijiazhuang Metro Line 1 using the A-type vehicle and the monolithic trackbed is taken as a case study to develop a corresponding LSR multi-factor prediction model by the moving loading method and the procedure mentioned above. The results indicate that the proposed method performs well and can be adopted to enhance the accuracy of track design or tunnel and environmental vibration prediction.

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Stress waves in half-space due to moving train loads by 2.5D finite/infinite element approach

Cited by 11 publications

References 22 publications

Model Test on Effect of Ground Fissure on the Behavior of Oblique Two-Section Subway Tunnel

Model Test on Effect of Ground Fissure on the Behavior of Oblique Two-Section Subway Tunnel

Evaluation of Factors Affecting the Performance of Fiber-Reinforced Subgrade Soil Characteristics Under Cyclic Loading

Multi‐Factor Modeling Method of the Load Sharing Ratio under Moving Train Loads

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