平潭海峡公铁大桥钻孔桩漏浆机理研究  

Study on Grouting Leakage Mechanism of Bored Pile of Pingtan Strait Highway and Railway Bridge

作　　者：范发财 FAN Facai(China Railway Construction Bridge Engineering Bureau Group Co.Ltd.,Tianjin 300308,China)

机构地区：[1]中国铁建大桥工程局集团有限公司,天津300308

出　　处：《铁道建筑技术》2022年第6期33-36,共4页Railway Construction Technology

基　　金：中国铁建股份有限公司科技研究开发计划项目(14-A01)。

摘　　要：平潭海峡公铁大桥基础采用钻孔灌注桩,由于水文、地质条件较为复杂,以B41号墩为代表的区域内海床面起伏明显且孤石数量较多,导致钢护筒无法打入足够深度,施工时出现严重漏浆现象。本文通过分析B41号墩漏浆特点,由压力平衡理论计算得出钢护筒理论埋置深度;考虑土层不均匀分布及孤石影响,采用Comsol Multiphysics软件构建渗流场计算模型,基于达西定律计算得到海床内孔隙水压分布情况及水力坡降,进而从本质上揭示该区域钻孔灌注桩漏浆机理,为类似地质条件下钻孔桩施工提供理论依据。The foundation of Pingtan Strait Highway and Railway Bridge adopts bored piles.Due to the complex hydrologic and geological conditions,the seabed surface in the region represented by B41 pier is obviously undulated and there are a lot of boulders,which leads to the failure of the steel casing to be driven into a sufficient depth and serious slurry leakage during construction.In this paper,by analyzing the characteristics of leakage of B41 pier,the theoretical buried depth of steel casing is calculated by the theory of pressure balance.Considering the influence of the soil is not evenly distributed and boulder,using Comsol Multiphysics software to build the seepage filed calculation model,based on Darcy’s law,the seabed in the distribution of pore water pressure and hydraulic gradient are calculated,and then the slurry leakage mechanism of bored piles in the region is essentially revealed,which provides a theoretical basis for the construction of bored piles under similar geological conditions.

关 键 词：跨海大桥 钻孔灌注桩 漏浆机理 渗流场 有限元分析 堵漏措施 

分 类 号：U448.121[建筑科学—桥梁与隧道工程] U443.154[交通运输工程—道路与铁道工程]