起伏地形上的铁路环境振动特性  

Effects of Rugged Topography on Railway Environmental Vibrations

作　　者：卢华喜[1] 万佳新 梁平英[1] 吴必涛[1] LU Hua-xi;WAN Jia-xin;LIANG Ping-ying;WU Bi-tiao(School of Civil Engineering,East China Jiaotong University,Nanchang 330013,China)

机构地区：[1]华东交通大学土木建筑学院,南昌330013

出　　处：《科学技术与工程》2020年第11期4520-4527,共8页Science Technology and Engineering

基　　金：国家自然科学基金(51868022);江西省教育厅科技项目(GJJ180300)。

摘　　要：越来越多的高速铁路修建在场地条件复杂的山区起伏地带,为了研究起伏地形对铁路环境振动的影响,建立了列车作用下路基-起伏地形的二维有限元计算模型,研究了4种起伏地形上的铁路环境振动特性。结果表明:4种起伏地形对地面加速度都存在减小效应;连续凸起地形上的竖向、水平振动位移均出现放大效应,而连续凹陷地形上的竖向、水平振动位移均出现减小效应;在凸起地形与凹陷地形组合的起伏地形上,凸起地形部分水平振动位移出现了明显的放大效应,凹陷部分水平振动位移又出现了明显的减小效应;先凸后凹地形对铁路环境振动的减弱作用比先凹后凸地形更明显。At present, more high-speed railways are being built in mountainous regions with complex and undulated topography. To study the influence of topographic relief on railway environmental vibration, two-dimensional finite element calculation models of subgrade vs undulated topography were established by finite element method. Four scenarios of topographic undulation were simulated, namely, continuous convex terrain(A), continuous concave terrain(B), first convex and then concave terrain(C), and first concave and then convex terrain(D). All the four scenarios could reduce the ground acceleration. In specific, the vertical and horizontal vibration displacements were increased in Scenario A while decreased in Scenario B. In the combination scenarios, due to the increasing effect in Scenario A and vice versa in Scenario B, in overall, Scenario C worked better in reducing the vibration displacement than Scenario D did. This conclusion can provide reference for railway design in mountainous areas.

关 键 词：起伏地形 铁路环境振动 地面加速度 振动位移 

分 类 号：U238[交通运输工程—道路与铁道工程]