提速对既有线路桥过渡段路基动力响应影响分析

英文篇名：Impact of speed raising on dynamic response of bridge-subgrade transition of existing railway
中文刊名：岩土工程学报
英文刊名：Chinese Journal of Geotechnical Engineering
作者：许杰 ; 王峰 ; 项宝余 ; 张旗 ; 轩振华
英文作者：XU Jie1 ; WANG Feng2 ; XIANG Bao-yu2 ; ZHANG Qi2 ; XUAN Zhen-hua1 (1.School of Naval Architecture and Civil Engineering ; Shanghai Jiao Tong University ; Shanghai 200030 ; China ; 2.Shanghai Railway Bureau ; Shanghai 210000 ; China)
中文关键词：既有线路基 ; 路桥过渡段 ; 动力响应 ; 无限元边界 ; 三维有限元方法
英文关键词：existing railway subgrade ; bridge-subgrade transition ; dynamic response ; infinite boundaries ; 3D FEM
出版日期：2010-08-15
机构：上海交通大学船舶海洋与建筑工程学院;上海铁路局;
年：2010
期：S2
出版单位：岩土工程学报

摘要

基于无限元人工边界建立了既有线有砟轨道路桥过渡段路基在动荷载作用下的三维有限元模型,模型考虑路桥过渡段倒梯形的结构形式,利用一系列移动轮载扩散到路基面的动面力模拟编组列车通过过渡段产生的动荷载,分析了既有线列车通行速度在现行速度80km/h和目标速度160km/h范围内变化时,路桥过渡段在动荷载作用下的路基动力响应规律。研究发现:列车速度从80km/h提升至160km/h后,路基面动应力峰值将增大20%左右;相比普通路基,路桥过渡段路基在提速条件下会产生较大的动应力;路基面动应力沿基面以下深度方向呈指数形态衰减。
Based on the infinite artificial boundaries,three-dimensional finite element model of existing railway subgrade of bridge-subgrade transition is established to study the response properties of the subgrade under moving load produced by trains of raising speed from 80 km/h to 160 km/h,considering the structure feature of inverse echelon.Moving load produced by trains passing through bridge-subgrade transition is simulated by a series of moving dynamic surface forces on subgrade surface due to wheel loads.It is pointed out that the peak value of dynamic stress on subgrade surface will increase by 20 percent when the train speed is upgraded to 160 km/h from 80 km/h,and vertical dynamic stress on the subgrade surface declines with depth in the form of exponential decay.Compared to the general subgrade,the brigde-subgrade transition produces greater dynamic stress on the conditions of the speedup of trains.

引文

[1]罗强,蔡英.高速铁路路桥过渡段的动力学性能分析[J].工程力学,1999,16(5):65-70.(LUO Qiang,CAI Ying.Dynamic performance analyses on high speed railway bridge-subgrade transition[J].Engineering Mechanics,1999,16(5):65-70.(in Chinese))
    [2]李献民,肖宏彬.行车速度对桥路过渡段路基动应力的影响[J].地震工程与工程振动,2005,25(1):50-53.(LI Xian-min,XIAO Hong-bing.Study on influence of train speeds upon the dynamic stress of bridge-approach roadbed[J].EarthQuake Engineering and Vibration,2005,25(1):50-53.(in Chinese))
    [3]刘升传,吴立坚.动荷载下路桥过渡段双线路基动力响应特性[J].交通运输工程学报,2009,9(6):26-31.(LIU Sheng-chuan,WU Li-jian.Dynamic response properties of two-way subgrade in bridge-subgrade transition under moving load[J].Journal of Traffic and Transportation Engineering,2009,9(6):26-31.(in Chinese))
    [4]郝瀛.铁道工程[M].北京:中国铁道出版社,2004.(HAO Ying.Railway Engineering[M].Beijing:China Railway Publishing House,2004.(in Chinese))
    [5]翟婉明.车辆-轨道耦合动力学[M].北京:科学出版社,2007.(ZHAI Wan-ming.Vehicle-track coupling dynamics[M].Beijing:Science Press,2007.(in Chinese))
    [6]陈果元.客运专线路桥过渡段动力特性的试验研究与数值分析[D].长沙:中南大学,2006.(YANG Guo-yuan.Experimental study and numerical analysis on dynamic properties of bridge-subgrade transition of passenger special line[D].Changsha:Central South University,2006.(in Chinese))