下穿便道对桥梁的影响及深厚软基加固方案研究  

Study on the Impact of Underpasses on Bridges and Reinforcement Options for Deep Soft Foundations

作　　者：彭宇肸 王琦 姜波 PENG Yuxi;WANG Qi;Jiang Bo(Guizhou Transportation Planning Survey&Design Academe Co.,Ltd.,Guiyang 550081,China)

机构地区：[1]贵州省交通规划勘察设计研究院股份有限公司,贵阳550081

出　　处：《交通科技》2025年第2期12-16,共5页Transportation Science & Technology

基　　金：贵州省交通运输厅科技项目(2022122003)资助。

摘　　要：基于软土地区地面荷载造成地基侧向变形的问题,文中结合某深厚软土地区既有高速公路下穿临时便道时的不同施工加固方案,综合考虑既有桥梁安全及重载车辆要求,探究不同车辆荷载及车辆间距对桥梁桩基影响,并进行监控实测验证。结果表明,车辆荷载与桩基水平位移呈正相关,采取钢板桩加固方案较无加固方案可有效限制桩基变形,数值模拟与监测数据相符。当车辆间距大于30 m时,车辆间距增大对桥梁桩基影响甚微。Based on the problem of lateral foundation deformation caused by ground load in soft soil areas,and combined with different construction reinforcement schemes for existing highway underpasses in a deep soft soil area,the effects of different vehicle loads and different vehicle spacing on bridge pile foundations were investigated,and the monitoring and verification was conducted,with taking into account the safety of existing bridges and the requirements of heavy-duty vehicles.The analysis results show that with the increase of vehicle load,the horizontal displacement of the pile foundation gradually increases,and the steel sheet pile reinforcement solution can effectively limit the pile foundation deformation compared to the solution without reinforcement,and the numerical simulation is consistent with the monitoring data.At the same time,when the vehicle spacing is greater than 30 m,the increase of vehicle spacing has little effect on the bridge pile foundation.

关 键 词：数值模拟 水平位移 桩基础 软土地基 

分 类 号：U415[交通运输工程—道路与铁道工程]