Analysis of track-soil spatial mapping relationship and evaluation of vehicle-induced vibrations considering deformation of ground
This paper focuses on the deformation spatial mapping relationship between ballast track structure and soil under ground deformation,besides,the vehicle-track-soil coupled vibration problem under the ground deformation-induced additional track deformation excitation was analyzed.The basic analysis framework consists of two models:1)the vehicle-track-soil dynamic interaction model;and 2)the track-soil deformation spatial mapping analysis model.Model 1 was the basic model for the dynamic analysis in this paper,which was established based on the conventional wheel-rail contact and finite element couplingmethods.Model 2 was used to analyze the track-soil deformation spatial mapping relationship,and the incremental and iterative methods were introduced for dealing with the nonlinear relationship of track-soil contact/separation,and verified with the ANSYS model.The ground deformation-induced additional track deformation and interlayer void were calculated by model 2,and were regarded as the external geometric excitation of the dynamic interaction model 1.The effects of long-wavelength additional track deformation and the interlayer dynamic contact on the vehicle-induced vibrations were analyzed based on the integration of the conventional track irregularity excitation.In the case studies,the mapping relationship between the additional deformation of the track structure and the ground deformation was analyzed by taking the surface settlement problem of a certain railway line in Guangzhou as a case study,and the coupled vibration law of the system under the condition of surface deformation was revealed from the viewpoint of dynamic interaction.The simulation results show that there is a strong mapping relationship between the additional deformation of the track structure and the soil settlement,but the interlayer between the track and the surface will not be completely in the contact state,but there is a localized void.The vibration of the system has obvious enhancement at the larger interlayer void area,in which the long-wavelength(low-frequency)components are caused by the lack of stiffness.Moreover,the ride safety and comfort of the vehicle deteriorate to different degrees in the ground settlement region.
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