隔离桩加固施工对邻近高铁桥梁沉降变形的影响分析  

Influence Analysis of Isolation Pile Reinforcement Construction on Settlement and Deformation of Adjacent High-speed Railway Bridge

作　　者：卢克晖 LU Kehui(China Railway 18th Bureau Group Co.,Ltd.,Tianjin 300222,China)

机构地区：[1]中铁十八局集团有限公司,天津300222

出　　处：《建筑施工》2020年第7期1313-1316,共4页Building Construction

摘　　要：采用数值模拟与现场实测相结合的方法,研究了隔离桩加固施工对邻近高铁桥梁桥墩及基础的影响,并对隔离桩的合理施工顺序进行了探讨。结果表明:桥墩不同方向的位移变形模拟值与实测值基本吻合,墩顶处的水平位移值最大,隔离桩施工数较多的一侧其竖向桥墩沉降量较大,桥梁桩基的变形呈“C”字形;隔离桩施工间隔越大,对邻近地基的影响越小;当采用“施一隔五”对称跳桩的隔离桩施工顺序时,对桥梁及已施工完成隔离桩产生的影响最小。相关研究成果可为盾构施工穿越既有铁路桥梁桩基的加固施工提供借鉴。By combining numerical simulation with field measurement, the influence of isolation pile reinforcement construction on adjacent high-speed railway bridge pier and foundation is studied, and the reasonable construction sequence of isolation pile is discussed. The results show that the simulated displacement and deformation in different directions of the pier are basically consistent with the measured values, the horizontal displacement value at the top of the pier is the largest, the settlement of the vertical pier on the side where there are many isolation piles under construction is large, and the deformation of the bridge pile foundation is in the shape of "C";the larger the construction interval of the isolation pile, the smaller the influence on the adjacent foundation;when the construction sequence of "one constructed isolation pile, five symmetrical jumping" is used, it has the least influence on the bridge and the completed isolation pile. The relevant research results can be used for reference in the reinforcement construction of the existing railway bridge pile foundation.

关 键 词：隔离桩 桥墩基础 数值模拟 现场实测 位移变形 施工顺序 

分 类 号：TU433[建筑科学—岩土工程]