116
DOI10.7672/sgjs2016010116
施工技术
CONSTRUCTION TECHNOLOGY
高速铁路路基动力响应研究
韩宜康
210031)
（南京铁道职业技术学院电力工程学院，江苏
南京
2016年1月上
第45卷
第1期
【摘要】针对京沪高速铁路上一处典型路基，利用Fortran语言编制车辆-轨道-路基动力大耦合计算程序，考虑轨道的不平顺性，对高速铁路路基的动力学特性进行了研究，得出以下结论：加速度、动应力以及位移随深度的增加而呈非线性减小，前两者最后趋于稳定：总体来讲，路基内的动应力值随列车速度的增大而增大。然而，路基本体内部不同埋深处的峰值加速度和峰值动应力、基床表层处的水平和竖向位移随着列车行驶速度的增加呈现多峰值现象。列车的轴重对基床表层处的竖向位移和路基本体内的动应力具有显著影响，但是对前者的影响要明显强于后
者，在后续重载铁路设计中需要重点考虑。【关键调】高速铁路；路基；动力响应；加速度
【中图分类号】TU758.11
【文献标识码】A
[文章编号】1002-8498(2016)01-0116-03
ResearchonDynamicResponsesofHigh-SpeedRailwaySubgrade
Han Yikang
(School of Electrical Engineering, Nanjing Institute of Railway Technology,Nanjing, Jiangsu 210031,China)
Abstract: Aiming at the typical subgrade in Beijing to Shanghai High-speed Railway, this paper establishes the vehicle-railway-subgrade coupled system by using the Fortran program which combines the ride performance, and then makes the parameter research, and the conclusions are shown as follows. Acceleration, displacement and dynamic stress decreases with the depth, and they reach to the stability. The dynamic stress increases with the velocity of the track, but the acceleration, displacement and dynamic stress with velocity of the track is the several peak phenomena, which shows that they do not increase with the velocity of track simply, but there are two discontinuity points. And this is very important for the operation, The dynamic responses increases with the axial load, but the most effect is displacement, the second is stress, and the last is acceleration. When the axial is bigger, its effect will
be bigger, and then we should pay more attenuation to the dynamic responses. Key words:high-speed railway; subgrade; dynamic responses; acceleration
高速铁路车辆-轨道-路基大耦合系统
为了研究高速铁路路基的动力学特性，本文选
取京沪高速铁路DK386+435.5工点为研究对象建立了车辆-轨道-路基耦合系统垂向动力学分析模型，如图1所示。在模型中，车辆采用CRH380型动车组的相关参数，通过刚性质量块进行仿真；轨道采用15kg/m型钢轨铺设，通过线性梁单元进行仿真分析，本构模型为线弹性模型；基床表层、基床底层、路基填土、轨道为莫尔-库仑模型。
2
高速铁路路基动力响应数值分析
2.1数值分析模型
·江苏省高等职业院校高级访间工程师计划资助项目(2013）[作者简介】韩宜康，讲师，硕士，E-mail：hyk1583@163.com
【收稿日期】2015-02-22；【修订日期】2015-11-10 万方数据
钢软-
轨道板
南心
基床表层
基保康世路基本体鲁
地基
图1 Fig.1
以此类推
x 地基
高速铁路车辆-轨道-路基大耦合系统 Vehicle-track-subgrade coupled system
of high-speed railway
基于上述大耦合系统，针对京沪高速铁路 DK386+435.5工点，依据设计图纸建立数值分析