Abstract
The characteristics of the vibrations induced by the passage of a high-speed train do not only depend on the train speed, axle load, and track irregularity but also depend on the properties of the foundation soil and the surrounding topography. Estimating the vibration characteristics in different terrains is therefore essential. This study investigates the characteristics of propagation and attenuation of the vibrations induced by high-speed trains in loess-terraced slopes. The influence of the soil mechanical properties on the propagation of vibrations is analyzed through a numerical simulation. Field experiments are conducted to measure the vibration induced by a high-speed train at a loess-terraced slope site in Qin’an, Gansu, China. The measured acceleration time history is analyzed in the time domain and frequency domain. The results show that, at the edge of each terrace level, the vibration in the Y direction is the strongest, followed by those in the X and Z directions. The peak ground acceleration values are amplified in all three directions at the fourth terrace level. A model describing the vehicle-roadbed-foundation-terraced slope system is established to study the influence of the elastic modulus of the soil on the vibration characteristics. A change in the elastic modulus of the foundation soil is found to have an evident influence on the horizontal and vertical vibrations in each terrace level. However, a change in the elastic modulus of the soil in a terrace only affects the vibration in that terrace and in the adjacent ones, whereas it has no effect on the vibrations in terraces located farther away. This study can provide some reference values for slope reinforcement along railways.
Highlights
Railways are important infrastructures and of great significance to the development of society and the improvement of the economy
Influence of Train Speed on Vibration Propagation. e acceleration in the vibration signal is the main information used for calculating the subgrade settlement, slope instability, and track deformation caused by a train load. e environmental vibration caused by train operation is mainly evaluated from the acceleration of the vibration signal, according to the stipulations of the “Measurement Method of Environmental Vibration in Urban Areas” [26]. erefore, in this study, the peak value of acceleration and the acceleration level
E = 75 MPa E = 105 MPa may be that the Rayleigh wave velocity of the soil is close to the vibration propagation velocity under the elastic modulus, which causes the resonance of the soil, so the peak acceleration of point B increases
Summary
Railways are important infrastructures and of great significance to the development of society and the improvement of the economy. Ang and Dai [11] used the moving element method to study the response of a nonuniform viscoelastic foundation under a moving load, and they considered the phenomenon of vehicle jump when wheel-rail contact is lost Among these approaches, field measurements are the most important. Eir results indicated that the vibration of the ground and buildings increased with an increase in train speed, whereas it attenuated with the distance from the railway lines. This study revealed the influence law of loess slope vibration under high-speed rail load to provide reference values for slope reinforcement along railways. E test point is located in the high-speed railway embankment section at the loess site. Test point 4 is located at the front edge of the fourth terrace level.
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