In-situ test and analysis of subgrade vibration with ballasted track in deep seasonally frozen regions

Li, Shanzhen; Ling, Xianzhang; Tian, Shuang; Ye, Yangsheng; Tang, Liang; Cai, Degou; Wang, Ke

doi:10.1016/j.trgeo.2021.100658

Cited by 9 publications

(7 citation statements)

References 37 publications

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“…Additionally, the waiting hall's second floor registers its peak acceleration at 10.81 Hz. In the course of vibrations transmitting from the waiting hall's first floor to the second floor, a rapid attenuation is observed in the high-frequency range (30)(31)(32)(33)(34)(35)(36)(37)(38)(39)(40). This attenuation phenomenon is primarily induced by interference from diverse structural and additional elements.…”

Section: Analysis Of Measured Acceleration Datamentioning

confidence: 99%

“…Ju et al [29,30], based on extensive field investigations, revealed a correlation between domain frequency and train speed. Li et al [31] and Tian et al [32] performed field vibration tests to explore vibration characteristics and the seasonal variation's impact. Celebi et al [33] conducted a series of field tests to investigate embankment vibrations under varying site conditions, analyzing the influence of HST speed and terrain on environmental ground vibrations.…”

Section: Introductionmentioning

confidence: 99%

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Research on vibration characteristics of a straddle-type station induced by moving trains

Lu,

Zhu,

Zhou

2024

Eng. Res. Express

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The novelty of straddle-type railway stations as a modern railway infrastructure necessitates thoroughly examining their vibration behavior under high-speed train-induced vibrations. This study focuses on Shangrao station, the inaugural straddle-type high-speed railway station in China, to investigate its vibration properties induced by high-speed trains. A comprehensive finite element model is developed and validated against empirical data to ensure accuracy. The vibration response and propagation patterns induced by railway operations are extensively studied under diverse operational conditions. The results illustrate that the peak acceleration in the vertical (Z) direction significantly exceeds that in the horizontal (X and Y) directions in most test cases. Moreover, under consistent train speed and axle load, the multiple parallel traffic scenario results in higher peak accelerations in all directions compared to the grade separation traffic scenario. Additionally, a positive correlation exists between the railway platform's maximum amplitude, corresponding frequency, and train speed. Furthermore, increased train axle load leads to higher peak accelerations in the station building. The findings of this research offer valuable insights for the predictive modeling and design of high-speed straddle-type railway stations, providing essential technical support for future station projects.

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Section: Analysis Of Measured Acceleration Datamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Research on vibration characteristics of a straddle-type station induced by moving trains

Lu,

Zhu,

Zhou

2024

Eng. Res. Express

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“…The influence of track mainly lies in the selection of track type (Li et al, 2021) and the height of subgrade (Mosayebi et al, 2017). Li et al (2018) proposed the attenuation formula of subgrade dynamic stress along depth as shown in Eq.…”

Section: Track Typementioning

confidence: 99%

A New Classification Method of Mine Goaf Ground Activation Considering High-Speed Railway Influence

Ren

Zou

et al. 2022

Front. Earth Sci.

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With the rapid development of high-speed railways in China, it is inevitable that some of the lines will have to traverse through the mine goaf ground, and there is little research on whether the “activation” of the foundation of the mine goaf ground occurs under the influence of train loads. In order to provide a safe and reliable basis for the construction of high-speed railway in mine goaf ground, a new classification method of mine goaf ground activation is proposed considering the stability and railway influence. First, the stability evaluation system of the mine goaf site is established with 3 primary indexes and 12 secondary indexes. The 47 groups’ data of the mine goaf ground site are collected as learning samples. Five machine learning methods including decision tree, discriminant analysis, support vector machine, and classifier ensemble are used to learn and test the data. The optimal algorithm is selected and the stability evaluation model is established to classify the stability of the mine goaf site. Second, influencing factors of railway are graded to establish an extension comprehensive evaluation model. Finally, based on the above two models, a new classification method of high-speed railway goaf ground activation considering the two factors and five sub-factors is proposed. Through the verification of two engineering examples, the prediction result of this method is “easily activation” and the need to treat the goaf area, and the actual construction is also taken to grouting treatment, proving that the method has certain guiding significance for the project.

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“…Under the tra c load, the subgrade soil is directly subjected to the large-cycle cyclic shear effect transmitted from the upper part. The strength of the subgrade continues to deteriorate and the permanent deformation continues to accumulate, resulting in many diseases such as wrinkles and cracks in the pavement structure, which seriously affects the safety, comfort and durability of the highway (7,8).In the cold region, due to the periodic change of temperature, the road pavement in the seasonal frozen region is more vulnerable to damage during the periodic freezing and thawing process of the roadbed (9)(10)(11).…”

Section: Introductionmentioning

confidence: 99%

“…As shown in Table 1, although domestic and foreign scholars have done a lot of research on the mechanical properties and deformation mechanism of railway subgrade in cold regions, and have made some academic achievements (12)(13)(14)(15). However, there are few studies on highway subgrade in cold regions, especially on the mechanics and deformation mechanism of thawed soil after freeze-thaw cycles.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on mechanical properties of subgrade soil in cold region under different conditions

Wang,

Li,

Jia

et al. 2023

Preprint

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In order to study the change of mechanical properties of subgrade under the condition of thawing after the highway in cold region is subjected to freeze-thaw action all the year round. In this paper, the effects of freeze-thaw cycles, freezing temperature, water content and confining pressure on the mechanical properties of subgrade soil in cold regions after thawing were studied by carrying out indoor mechanical tests, and the mechanical properties of subgrade soil in cold regions after thawing under different conditions were measured. The test results show that : 1 ) after 7 freeze-thaw cycles, the failure stress of subgrade soil decreases from 321.7 kPa to 289.9 kPa, with a decrease of 9.9%, and the elastic modulus decreases by 19.9%. 2 ) When the freezing temperature is reduced from − 5°C to − 15°C, the failure stress of subgrade soil is reduced from 303.9 kPa to 290.1 kPa, which is reduced by 13.8 kPa. The reduction range is about 4.5%, and the elastic modulus is about 1.6%;3 ) When the water content increased from 6–12%, the failure stress decreased from 405.43 kPa to 288.4 kPa, with a decrease of 29.1%, and the elastic modulus decreased approximately linearly, with a decrease of 50.4%. 4 ) When the confining pressure increases from 50 kPa to 150 kPa, the failure stress increases from 194.7 kPa to 367.7 kPa, and the failure stress increases by 88.8%. The elastic modulus increases by 154.1% with the increase of confining pressure. The research results can provide reference for highway and engineering construction in the western silty sand distribution area.

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In-situ test and analysis of subgrade vibration with ballasted track in deep seasonally frozen regions

Cited by 9 publications

References 37 publications

Research on vibration characteristics of a straddle-type station induced by moving trains

Research on vibration characteristics of a straddle-type station induced by moving trains

A New Classification Method of Mine Goaf Ground Activation Considering High-Speed Railway Influence

Experimental study on mechanical properties of subgrade soil in cold region under different conditions

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