Dynamic characteristics of track-ballast-silty clay with irregular vibration levels generated by high-speed train based on DEM

Zhang, Zhihua; Zhang, Xiedong; Qiu, Hongsheng; Daddow, Mohammad

doi:10.1016/j.conbuildmat.2016.08.079

Cited by 42 publications

(13 citation statements)

References 28 publications

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“…is method can be used in geotechnical engineering [25,[34][35][36], load transfer mechanism [31], soil failure [37,38], failure mechanism [39], micromechanisms [30], high-speed train operation [9], metro train operation [40,41], fluidization [27], particle migration [42], strain softening [43], and filling capacity of concrete [44].…”

Section: Discrete Element Methodmentioning

confidence: 99%

“…For axially loaded piles, various methods have been used, including field tests [1][2][3] and laboratory tests [4][5][6][7]. For the field tests, Zhang et al [8] examined the influence of the press pile on material strength, which can have positive impact on mobilizing the shaft resistance [9]. Comparing field tests with laboratory tests, the field tests are rather complicated and the laboratory tests are relatively simple.…”

Section: Introductionmentioning

confidence: 99%

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Dynamic Characteristics of the Surrounding Soil during the Vibrational Pulling Process of a Pile Based on DEM

Sun

Zhang

Yang

et al. 2020

Shock and Vibration

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When bridge construction has been completed, the temporary support system, such as a steel-pipe pile, is dismantled, and problems that are related to the steel-pipe piles pulling from the strata are encountered. It is difficult to measure the dynamic characteristics of the surroundings during the deep pile-pulling process. A numerical model of the pulling pile is established by using the discrete element method (DEM). A sinusoidal dynamic load is executed on the pile with various vibrational frequencies. The stress, bond, coordination number, porosity, and velocity field distribution of the surrounding soil during the pile-pulling process are studied. The results demonstrate that, during the pile-pulling process, the shearing state of the surrounding soil depends on the position of the pile. The number and area of bond fractures gradually increase, the coordination number decreases, and the porosity gradually increases when the pile-pulling distance increases. Under a vibrational load, the area that corresponds to particles with large velocity and displacement expands with the increase of the vibrational frequency. The major influence zone of the pile pulling on both sides is concentrated within 6dpile, which can be used to evaluate the safety of the existing bridge nearby during pile pulling.

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Section: Discrete Element Methodmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Dynamic Characteristics of the Surrounding Soil during the Vibrational Pulling Process of a Pile Based on DEM

Sun

Zhang

Yang

et al. 2020

Shock and Vibration

Self Cite

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show abstract

“…Benedetto et al [12] investigated the response of a rubber mixed ballast which would have low stiffness and the results should increase in vibration in low frequency bands of 10 -30 Hz. Zhang et al [13] found that the increase in thickness, decreases particle velocity. This would decrease the vibration levels as well.…”

Section: Selected Parametersmentioning

confidence: 99%

Suppression of Ground Borne Vibration Induced by High-Speed Lines

et al. 2018

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Abstract. Vibration of high-speed lines leads to annoyance of public and lowering real estate values near the railway lines. This hinders the development of railway infrastructures in urbanised areas. This paper investigates the vibration response of an isolated rail embankment system and modifies the component to better attenuate ground vibration. Mainly velocity response is used to compare the responses and the applied force is of 20 kN at excitation frequencies of 5.6 Hz and 8.3 Hz. Focus was made on ground-borne vibration and between the frequency range of 0 and 250 Hz. 3D Numerical model was made using SolidWork software and frequency response was produced using Harmonic Analysis module from ANSYS Workbench software. For analytical modelling MATLAB was used along with Simulink to verify the mathematical model. This paper also compares the vibration velocity decibels (VdB) of analytical twodegree of freedom model mathematical model with literature data. Harmonic excitation is used on the track to simulate the moving load of train. The results showed that modified analytical model gives the velocity response of 75 VdB at the maximum peak. Changes brought to the mass and spacing of the sleeper and to the thickness and the corresponding stiffness for the ballast does not result in significant vibration response. Limitations of two-degree analytical model is suspected to be the cause of this inactivity. But resonance vibration can be reduced with the aid of damping coefficient of rail pad. Statistical analysis methods t-test and ANOVA single factor test was used verify the values with 95% confidence.

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“…Thus, the effect of seepage is not taken into account in this study. As the silty clay being hard-solved problem in the world due to its low strength and strong plasticity [6], it is necessary to take silty clay into account in the model. Parameters of each stratum are shown in Table 1.…”

Section: Cross-river Tunnel Modelmentioning

confidence: 99%

Discrete element analysis of the excavation effect of cross-river tunnel on the surroundings

Liu

Zhang

2017

MATEC Web Conf.

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Abstract. Cross-river tunnel as one of the underground constructions is complicated during its construction. For stability of tunnel excavation, it is emergency to analyze the dynamic characteristics of tunnel deformation under high water pressure. Therefore, a cross-river tunnel model is proposed based on DEM in this paper. Stiffness of particles decreases during excavation process which is as one of excavation methods. Porosity ratio of original porosity over its value at different excavation time has been considered. Radial displacements of particles at different angle around the tunnel are detected during excavation process. It shows that large deformation occurs at the vault of the excavation zone which accompanies with large radial displacement. The upper half of the tunnel performs larger deformation than the lower half part which results in many cracks in the concrete lining, the high water pressure may play an crucial role in it.

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Dynamic characteristics of track-ballast-silty clay with irregular vibration levels generated by high-speed train based on DEM

Cited by 42 publications

References 28 publications

Dynamic Characteristics of the Surrounding Soil during the Vibrational Pulling Process of a Pile Based on DEM

Dynamic Characteristics of the Surrounding Soil during the Vibrational Pulling Process of a Pile Based on DEM

Suppression of Ground Borne Vibration Induced by High-Speed Lines

Discrete element analysis of the excavation effect of cross-river tunnel on the surroundings

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