新建桥桩施工对既有设施结构桩基础的影响分析

Analysis on Influence of Bridge Pile Construction on Existing Facilities Foundation

新建桥梁桩基施工过程中会扰动桩周土体,使周围土体和既有设施结构桩基础发生相互作用,严重者将导致既有设施结构桩基随之发生移动和变形,从而引发重大安全事故。采用三维有限元方法,对某新建桥桩的施工过程进行模拟计算,研究在各步序施工条件下新建桩基施工对周围土体变形的影响,并分析了新建桩基各施工步序对既有排污管道桩基础与既有桥梁桩基变形的影响。结果表明,在充分考虑新建桩基施工对周围土体扰动的情况下,对既有设施桩基的变形影响有限,均在现行规范控制标准内。

The construction of the new bridge pile foundation has the impact on the soil around piles,making the surrounding soils and existing facilities interact with each other,resulting in existing facilities movement and deformation,and causing significant safety accidents. Based on the construction of pile foundation of a new bridge,by using 3-D finite element method,the influence of surrounding soil deformation under step construction condition is researched,and the influence of steps of the construction sequence on the deformation of existing sewage pipelines and bridge are analyzed. The research results provide technical guidance and practical experience for similar engineering.