下穿运营桥梁公路路基设计方案研究  

Research on Design Scheme of Highway Subgrade Undercrossing Operating Bridge

作　　者：刘长伟 LIU Changwei(China Railway 19th Bureau Group First Engineering Co.,Ltd.,Liaoyang 111000,Liaoning,China)

机构地区：[1]中铁十九局集团第一工程有限公司,辽宁辽阳111000

出　　处：《路基工程》2022年第3期177-181,共5页Subgrade Engineering

摘　　要：依托某工点下穿既有线桥梁工程,运用有限元软件分析CFG桩复合地基施工、轻质土路堤填筑以及后期运营对已有桥墩桩基的影响,验证路基工程泡沫轻质土填方+CFG桩设计方案的可行性。研究结果表明:路基施工对桥桩基弯矩、位移变化有一定的影响,且对两侧桥桩基影响大于中间桥桩基,但整体变化量较小,符合工程要求。Relying on a work station undercrossing the existing line bridge project,it analyzes the impact of CFG pile composite foundation construction,light soil embankment filling and later operation on the existing pier pile foundation by using the finite element software and verifies the feasibility of subgrade engineering foamed lightweight soil fill+CFG pile design scheme.The results of the research show that the subgrade construction has a certain impact on the bending moment and displacement of the bridge pile foundation,and the impact on the bridge pile foundation of both sides is greater than that of the middle bridge,but the overall change is small,which meets the engineering requirements.

关 键 词：公路 下穿既有线 桥梁桩基 变形影响 设计方案 数值计算 

分 类 号：U416.1[交通运输工程—道路与铁道工程]