公路路基穿越高铁桥墩墩顶变形敏感因素分析  

Analysis of sensitive factors of pier Top deformation of highway subgrade crossing high-speed railway bridge

作　　者：冯志文 晏长根[2] FENG Zhiwen;YAN Changgen(Shanxi Chengda Highway Survey and Design Co.,Ltd,Taiyuan 030006,China;Highway College,Chang'an University,Xi'an 710054,China)

机构地区：[1]山西诚达公路勘察设计有限公司,太原030006 [2]长安大学公路学院,西安710054

出　　处：《内蒙古工业大学学报（自然科学版）》2023年第2期178-183,共6页Journal of Inner Mongolia University of Technology：Natural Science Edition

基　　金：国家自然科学基金项目(42077265)。

摘　　要：针对干线公路采用路基形式穿越高速铁路桥墩所导致的墩顶变形,为明确墩顶变形的主要影响因素及其相关性,以实际项目为依托,采用数值模拟分别从公路与铁路的交叉角度、公路路基的填筑高度、路基换填深度、原地层土体的内摩擦角4个方面计算分析桥墩顶部各点的位移变形。结果表明:随着交叉角度的减小,桥墩顶部的变形变大,同时横向倾斜差也在增加;路基填筑高度越大,桥墩顶部的变形越大,且影响十分显著;路基换填深度的增加会导致桥墩顶部的变形明显增加;桥墩所在地层土体的内摩擦角增大,桥墩顶部的变形减小。In view of the pier top deformation caused by the trunk highway crossing the high-speed railway pier in the form of subgrade,in order to clarify the main influencing factors of pier top deformation and their correlation,based on the actual project,numerical simulation is used to calculate and analyze the displacement and deformation of each point on the pier top from the intersection angle of highway and railway,the filling height of highway subgrade,the subgrade replacement depth,and the internal friction angle of the original ground soil.The results show that with the decrease of the crossing angle,the deformation of the pier top becomes larger,and the lateral inclination difference also increases;the higher the subgrade filling height is,the greater the deformation of the pier top is,and the influence is very significant;the increase of subgrade replacement depth will lead to the obvious increase of pier top deformation;the internal friction angle of the stratum soil where the bridge pier is located increases,and the deformation of the top of the bridge pier decreases.

关 键 词：岩土工程 公路穿越铁路 数值模拟 交叉角度 桥墩顶部变形 填筑高度 

分 类 号：U416.1[交通运输工程—道路与铁道工程]