地震-列车移动荷载耦合作用下高铁路基振动特性研究

基于轨道结构-路基-地基动力相互作用理论,建立考虑地震-列车移动荷载耦合输入的轨道结构-路基-地基动力学模型,研究高速铁路路基及轨道在耦合荷载作用下的振动响应问题.通过编制DLOAD子程序并与ABAQUS有限元计算程序联立,实现地震荷载与列车移动荷载耦合作用的施加,以高速铁路桩承式路基及自由式路基为研究对象,对地震-列...

Vibration Characteristics of High-speed Railway Subgrade under Earthquake-Train Moving Load Coupling

To analyze the vibration responses of high-speed railway subgrade and track under the coupling action of seismic load and train moving load, a dynamic model of track structure-subgrade-foundation considering the coupling input of earthquake-train moving load was established based on the dynamic interaction of track structure-subgrade-foundation. First, DLOAD subroutine and ABAQUS finite element calculation program were compiled to realize the coupling effect of seismic load and train moving load. Then, the numerical simulation was carried out to analyze the dynamic responses of pile-supported subgrade and free subgrade of high-speed railway under the coupling action of seismic load and train moving load, and the vibration response difference between them were compared. The numerical results showed that the coupling load has a significant effect on the dynamic response of pile-supported subgrade. Under the coupling load, the resonance phenomenon occurs on the pile-supported subgrade, which makes the vibration displacement amplitude of track and subgrade in pile-supported subgrade larger than that of free subgrade. The pile-supported subgrade will not affect the vibration frequency of subgrade system, but will change the vibration amplitude. The acceleration in the X direction of track on pile-supported subgrade, the vertical acceleration at the shoulder and toe of subgrade are reduced by 6.2%, 50%, and 28.6%, respectively.