特大桥桥墩基础对堤防渗流稳定影响的三维有限元分析
Three-dimensional finite element analysis of the influence of bridge pier foundation on the stability of levee seepage for a long bridge
卢书红1
作者信息
摘要
随着"十四五"交通规划的实施,跨河桥梁逐渐增多.为减小桥梁对行洪的影响,河道内跨径增大,但堤防跨径一般布置得较小,跨堤桥墩基础距离堤脚较近.桥梁桩基深度达20m～30m,容易扰动堤防临背河测土层形成渗流通道,影响堤防的安全.因此跨堤桥墩基础对堤防渗流稳定影响的计算分析对堤防工程安全具有重要意义.目前二维模型适用于均质土层的渗流稳定计算,而桥墩基础采用钢筋混凝土结构,与土层结合时容易形成空隙,采用三维有限元分析方法能够更好的模拟出不同介质的空间形态,计算结果更为准确.
Abstract
With the implementation of the 14th Five-Year Plan for Transportation,more and more cross-river bridges are being built.In order to reduce the impact of bridges on flood control,the river span is increasing,but the levee span is usually arranged smaller,and the bridge pier foundation is located close to the toe of the levee.The pile foundation depth of the bridge reaches 20m～30m,which easily disturbs the soil layers at the upstream and downstream sides of the levee to form seepage channels,affecting the safety of the levee.Therefore,the calculation and analysis of the influence of the levee on the seepage stability of the bridge pier foundation are of great significance for the safety of levee engineering.The two-dimensional model is suitable for seepage stability calculations in homogeneous soil layers,while the bridge pier foundation is made of reinforced concrete structure,which is easy to form voids when combined with the soil layers.The three-dimensional finite element analysis method can better simulate the spatial shape of different media,and the calculation results are more accurate.
关键词
特大桥桥墩/堤防/渗流稳定/三维/有限元Key words
large bridge piers/levees/seepage stability/3D/finite element引用本文复制引用
出版年
2025
NETL
NSTL
万方数据