西宝高铁黄土地区路基振动效应空间分析研究  

Spatial Analysis and Study of Roadbed Vibration Effect on Loess Area for Xi'an-Baoji High-speed Railway

作　　者：孟祥连[1] 周福军[1] 

机构地区：[1]中铁第一勘察设计院集团有限公司,西安710043

出　　处：《铁道工程学报》2017年第8期28-33,共6页Journal of Railway Engineering Society

基　　金：国家自然科学基金项目(41272322):高速铁路列车特殊振动的地质环境效应及其成灾机理的研究;中铁第一勘察设计院集团有限公司院属科研课题"黄土地区高速铁路列车特殊振动的不良地质环境效应及其成灾机理研究"(院科13-11)

摘　　要：研究目的:伴随我国西部大开发、"一带一路"、"八横八纵"高速铁路网等重大工程战略的深入建设,西部黄土地区高速铁路、客运专线等高等级的轨道交通项目越来越多。为研究高速列车通过时对周边地面地层体的环境效应,本文选择某典型路基工程开展现场振动效应实测,分析振动沿地表、地下深度的强度、时程、频谱等空间特征,以期为同类工程设计和工程措施设置提供基础支持和理论借鉴。研究结论:(1)黄土地区高速列车运行产生的振动荷载,对周边地面地质体沿地表、地下深度产生空间环境效应;(2)列车引起的振动强度随距离增大、深度增加而衰减,衰减快慢在一定位置产生变化;沿水平、垂直方向振动强度与列车速度、列车轴重呈正比例关系,振动持续时间与列车长度呈正相关关系;振动频率分布沿地表与列车速度呈负相关关系,在垂直方向随深度增加越集中;(3)黄土的结构性、非均匀性,使得振动在局部位置产生反弹增大现象;(4)该研究成果可为高速铁路路基工程设计提供技术支持,并可为同类岩土工程建设提供理论借鉴。Research purposes： With the construction and development oi China＇s western region, the Belt ano Road initiatives, high - speed railway net and other major projects, there are a large number of rail transit project on western loess area. The typical roadbed has been selected, and field tests have been carried out, in order to study the environmental effects of ground near the railway, when the train passes. In this paper, the strength, time and frequency spectrum and other spatial features of vibration have been analyzed to provide support for design and measures of similar engineering on loess area. Research conclusions： （ 1 ） The vibration load produced by high speed train running, caused the spatial effect on ground surface and underground depth for strata. （2）The strength of vibration caused by train running decreased with the increase of distance and depth. The reduced acceleration changes at certain location. The strength is directly proportional with the train speed and weight along both horizontal and vertical directions, the mathematical relationship is the similar between vibration time and train length. But the distribution of vibration frequency is inversely proportional with train speed along ground surface, and the vibration frequency is concentrated along depth. （3）The vibration produces a rebound and increases in the local position, due to the structural and nonuniformity of loess strata. （4） The research resuhs can provide technical support for high -speed railway subgrade engineering design, and provide theoretical reference for similar geotechnical engineering.

关 键 词：高速铁路 黄土地区 路基工程 振动效应 现场测试 空间分析 

分 类 号：P642.13[天文地球—工程地质学] U212.22[天文地球—地质矿产勘探]