新建公路下穿高速铁路桥梁位移控制研究  

Study on Displacement Control of New Highway Undercrossing High Speed Railway Bridge

作　　者：徐有为 Xu Youwei

机构地区：[1]湖南聚创建筑科技有限公司

出　　处：《城市建筑》2023年第14期191-194,共4页Urbanism and Architecture

基　　金：湖南省交通科技项目(202103)

摘　　要：高速铁路运行对线路的竖向、水平变形要求极为严格,新建公路下穿高速铁路施工会对既有高速铁路桥梁的位移控制产生不利影响。据此提出了以轻质泡沫土代替普通土进行路基填筑的方法,并通过数值模拟分析了轻质泡沫土填筑方式对既有高速铁路桥梁的位移控制效果。结果表明,采用轻质泡沫土可有效减少60%的桥墩顺桥向位移与68%的桥墩竖向位移,同时可减少60%以上的桥梁桩基的负摩阻力与附加轴力。The operation of high speed railway has extremely strict requirements for vertical and horizontal deformation of the line.The construction of the new highway undercrossing the high-speed railway will adversely affect the displacement control of the existing high-speed railway bridge.Thus,the method of filling subgrade with light foam soil instead of ordinary soil is proposed,and the displacement control effect of light foam soil filling method on the existing high-speed railway bridge is analyzed through numerical simulation.The results show that the use of lightweight foam soil can effectively reduce the displacement of piers along the bridge direction by 60%and the vertical displacement of piers by 68%.At the same time,the negative friction and additional axial force of bridge pile foundation can be reduced by more than 60%.

关 键 词：位移控制 数值模拟 高速铁路 负摩阻力 

分 类 号：U455.4[建筑科学—桥梁与隧道工程]