黄土地区路基地段高速铁路无砟轨道环境振动研究

项目名称： 黄土地区路基地段高速铁路无砟轨道环境振动研究

项目编号： No.51468036

项目类型： 地区科学基金项目

立项/批准年度： 2015

项目学科： 建筑环境与结构工程学科

项目作者： 李斌

作者单位： 兰州交通大学

项目金额： 48万元

中文摘要： 黄土地区高速铁路无砟轨道在列车动荷载作用下将产生周边环境的振动，对临近建筑物及地下管道、精密仪器和设备等产生不利影响，目前国内外对该问题还缺乏系统研究。本项目拟针对黄土环境振动问题，对路基地段高速铁路无砟轨道列车动荷载作用条件下，黄土地区环境振动的传播机理进行理论与试验研究。采用车辆-轨道耦合动力学理论，研究高速列车动荷载的幅值和频率等振动特征；在弹塑性本构理论基础上，通过室内黄土特性参数试验，建立原状黄土的动本构模型，然后研究列车动荷载诱发的黄土振动传播计算方法；基于无砟轨道-路基-黄土地基有限元模型，研究列车荷载作用下黄土地基的振动特性和相关影响因素，并通过现场试验研究黄土振动传播特性。通过对计算结果和实测结果的对比分析，揭示路基地段高速铁路无砟轨道列车动荷载诱发黄土环境振动的传播机理。研究成果将为丰富和完善黄土地区高速铁路无砟轨道环境振动理论，降低黄土地区环境振动提供参考。

中文关键词： 高速铁路；无砟轨道；环境振动；黄土

英文摘要： Ballastless track of high speed railway on subgrade section in loess area will make the surrounding environment vibration under the action of the train, the impact is more prominent on nearby buildings, underground pipes, precision instruments and other equipment produced. The systematic research on the issue is lack at home and abroad. This project aims at research of environmental vibration propagation mechanism under the action of train load on high-speed railway ballastless track in loess area by the research method of theory and experiment. The wheel-rail coupling dynamics theory is applied to analyze the action characteristics of the high-speed dynamic train load including amplitude and frequency. With the theoretical parameters through laboratory tests and elastic plastic theory, dynamic constitutive model of undisturbed loess is established. The vibration propagation theory and dynamic constitutive model of loess is applied to analyze the calculated method on vibration propagation caused by the action of dynamic train load. Based on the finite element model including track, subgrade and loess, the vibration characteristic of loess and its influence of correlative factors is researched with the dynamic train load acting. The data support on the vibration propagation characteristics of loess is provided with field test of ballastless track of high-speed railway. Combined the theoretical analysis, laboratory and field test, the propagation mechanism of the Loess vibration is revealed caused by the dynamic loads of high speed trains. The research will be helpful to enrich the environmental vibration theory and to reduce the environmental vibration in loess area in ballastless track of high-speed railway.

英文关键词： high-speed railway;ballastless track;environnent vibration;loess