台背高填路基对墩桩影响的数值仿真模拟分析

Numerical simulation analysis on the effect of Abutment High Fill Subgrade on pile

高填路基对邻近墩桩结构会产生不利的影响,尤其当填方土体量较大,地基中含有一定厚度的软弱夹层时,其产生的不利影响更不容小视。文章结合工程实际,考虑台背填方自重、软弱夹层等因素,采用有限元软件,通过建立墩桩的内力与位移的计算模型及桥墩、地基与桩基础的空间计算模型,并比对现场实测位移数据,研究开挖卸载不同程度的台背填方路基下墩桩的力学与变形特性,同时,对比不同位置处的桩基计算结果。以期为同类桥梁工程的桩基础设计、施工规范及安全运营提供依据和经验。

High fill subgrade brings adverse effects on the structure of bridge pier and pile foundation, especially when the embankment fill is large and there is a certain thickness of soft interlayer under the subgrade should pay more attention to its unfavorable influence. Based on the engineering practice, considering the self - weight of bridge abutment back filled sub -grade and soft interlayer under the subgrade, etc. by using finite element analysis software, internal force and displacement of the bridge pile foundation calculation model is built in this paper. Comparing with the on - the - spot measurements, pile foundation of mechanical and displacement characteristics are studied under different excavation unloading degree working conditions of bridge pier, and the pile foundation calculation results of different location are compared, in order to provide theoretical basis and technical support for the design and construction of similar bridge substructure engineering.