铁路列车荷载下桩承式路堤动力响应特性分析  

Dynamic Response Analysis on Pile-Supported Embankment under High Speed Train Load

作　　者：王有昌 余涛 付强 WANG Youchang;YU Tao;FU Qiang(Kunming Survey and Design Institute of State Forestry and Grassland Administration,650031,Kunming,PRC;Kunming Ambo Construction Engineering Co.Ltd.,650501,Kunming,PRC;College of Civil Engineering,Guangzhou University,510006,Guangzhou,PRC)

机构地区：[1]国家林业和草原局昆明勘察设计院,昆明650031 [2]昆明安博建筑工程有限公司,昆明650501 [3]广州大学土木工程学院,广州510006

出　　处：《江西科学》2023年第2期349-355,共7页Jiangxi Science

摘　　要：软土地区列车荷载作用下的路基沉降问题是高速铁路安全运行的主要影响因素,桩承式路基则可有效地降低铁路整体沉降。因此,创建铁路桩承式路基三维动力模型,模拟列车动荷载作用下铁路桩承式路基动力响应,同时进行轨道线下各结构参数影响因素分析。结果表明:管桩封顶后,桩与垫层接触面积随之增加,桩土荷载分担比相应地增加,路堤整体动位移以及影响范围也减小;桩与垫层动力相互作用大于桩与土相互作用;刚性桩体有向上刺入垫层的趋势,沿垫层底部动位移曲线形式类似于“W”型,并且沿中心桩向外,动位移变化曲线逐步变缓,到路堤坡脚处接近于0;桩和垫层承担了大部分振动荷载,减弱了上部荷载在复合地基内部的影响以及动力波传播影响范围,同时有效地控制路堤和地基沉降,确保高速铁路列车平稳安全运行。The settlement of subgrade under train load in soft soil area is the main influence factor to the safe operation of high-speed railway.The pile-supported subgrade can effectively reduce the settlement of the railway.This paper has established a three-dimensional dynamic coupling finite element model of tracks-embankment-pile-soil composite foundation,to simulate the dynamic response character and propagation mechanisms of embankment and composite foundation.Parameters studies of modulus changes are also presented on the dynamic response of pile-supported foundation.The results show that the interface area between cushion and pile increases with the closing of pipe pile top,the load-sharing ratio of the pile and soil increases significantly.The magnitude and scope of dynamic displacement for subgrade decrease.The dynamic interaction between pile and cushion layer is getting greater than that between soil and cushion layer.Rigid piles tend to penetrate into cushion layer,the dynamic curve along the cushion layer surface is similar to type‘W’,the dynamic displacement decreases from the center pile to outward,comes close to 0 at embankment foot.The pile-supported embankment can bear most of the dynamic load,reduce the dynamic load on foundation soil,the dynamic wave propagation influence range and the influence of upper load on composite foundation effectively.The pile structures can control the settlement of embankment and foundation effectively,and keep high speed railway train operating with steady and safety.

关 键 词：高速铁路 振动荷载 桩土复合地基 动力响应 动力波传播 

分 类 号：TU435[建筑科学—岩土工程]