高速铁路埋入式桩板结构分界路基填高研究  

Research on Boundary Filling Height for Embedded Pile⁃Plate Structure of High Speed Railway

作　　者：徐玉龙[1] 孙红林[1] 曾长贤[1] XU Yulong;SUN Honglin;ZENG Changxian(China Railway Siyuan Survey and Design Group Co.Ltd.,Wuhan 430063,China)

机构地区：[1]中铁第四勘察设计院集团有限公司,武汉430063

出　　处：《铁道建筑》2023年第9期121-127,共7页Railway Engineering

基　　金：中铁第四勘察设计院集团有限公司软件开发课题(2020D036)。

摘　　要：针对高速铁路浅埋式和深埋式桩板结构存在分界路基填高不明确且与设计荷载不匹配的问题,采用理论研究方法对列车动应力、水平力及温度作用在路基上影响深度进行分析,确定了埋入式桩板结构分界路基填高。结果表明:列车动应力在3.0 m深度基本衰减为路基自重的20%以下;采用Holl弹性理论分析列车水平力在路基结构内扩散情况,列车水平力在路基结构内影响主要集中在1.5 m深度内;建立日照温差在路基结构内传导的非稳定态热传导偏微分方程,采用傅里叶正弦变换法求解获得日照温差影响主要集中在路基面以下0.5 m范围内;浅埋式桩板结构与深埋式桩板结构分界路基填高主要受动应力影响深度控制,建议分界路基填高按3.0 m控制。In response to the problems of unclear subgrade boundary filling height and mismatch with design load for shallow-buried and deep-buried pile-plate structures in high speed railways,theoretical research methods were used to analyze the influence depth of train dynamic stresses,horizontal forces,and temperature effects on the subgrade.The subgrade boundary filling height for the embedded pile-plate structure was determined.The results show that the dynamic stresses of the train would attenuate to less than 0.2 times the self-weight of the subgrade at a depth of 3.0 m.The diffusion of train horizontal force within the subgrade was analyzed using Holl’s elastic theory,and the influence of train horizontal force on the subgrade structure was mainly concentrated within a depth of 1.5 m.A non-steady-state heat conduction partial differential equation was established to describe the conduction of diurnal temperature variation within the subgrade,and the Fourier sine transform method was used to solve it.The impact of diurnal temperature variation was found to be mainly focused within a range of 0.5 m below the subgrade surface.The subgrade boundary filling height between shallow-buried and deep-buried pile-plate structures is mainly controlled by the depth influenced by dynamic stresses,and it is recommended to control the subgrade boundary filling height at 3.0 m.

关 键 词：铁路路基 分界填高 理论分析 桩板结构 动应力 水平力 日照温差 

分 类 号：TU318.1[建筑科学—结构工程] U213.1[交通运输工程—道路与铁道工程]