高铁路基动载沉降现场监测分析  

Field monitoring and analysis of dynamic load settlement of high speed railway subgrade

作　　者：王敏[1] 李义杰 徐林荣[1] 

机构地区：[1]中南大学土木工程学院,长沙410075 [2]中国铁路设计集团有限公司,天津300251

出　　处：《土木建筑与环境工程》2017年第6期22-29,共8页Journal of Civil,Architectural & Environment Engineering

基　　金：铁道部科技研究开发计划项目(2012G009-C);国家自然科学基金(51078358);高铁联合基金(U1134207)~~

摘　　要：高铁路基的工后沉降控制是一大难题,其中,动荷载影响的研究尚处于数值计算与试验阶段。依托沪宁城际铁路建设、运营监测数据,基于分离动、静荷载引起沉降的思路,通过静载作用沉降与实测运营沉降取差值,获取动载作用下的沉降测试值,分析了路基由动载引起的沉降特性。结果表明:动载引起的沉降对运营后实测沉降的贡献有限,并不是引起部分断面总体沉降偏大的主要原因;不同地质条件及路堤填筑高度对动载引起沉降的影响较小;动载引起沉降的速率在运营前期发展较快并达到最大,之后沉降速率减小,沉降趋于稳定,运营后的第4年累积沉降约为2~3mm。The control of settlement after construction of subgrade for high speed railway is a difficult problem,and the study of dynamic load is still in the stage of numerical calculation and experiment.Therefore,relying on the construction and operation monitoring data of Shanghai-Nanjing intercity railway,test values of settlement under the action of dynamic load are used to analyze the settlement characteristics caused by dynamic load based on the method of separating the settlement caused by static and dynamic load.The results show that settlement caused by dynamic load has limited contribution to the operation data of the settlement,while it is not the main reason causing settlement large.Different geological conditions and construction of embankment height have little influence on the settlement caused by dynamic load.Settlement rate caused by dynamic load is faster and reaches the maximum in the early development of the operation,then gradually decreases.The settlement tends to be stable after operationfour years is about 2~3 mm.

关 键 词：高速铁路 路基 动荷载 工后沉降 

分 类 号：U213.1[交通运输工程—道路与铁道工程] TU413.5[建筑科学—岩土工程]