基坑开挖对邻近桥桩影响的实测及数值分析

Actual Measurement and Numerical Analysis of Adjacent Bridge Piles in Foundation Pit Excavation

基坑开挖对邻近桩基的位移场和应力场的变化成为关注的热点。本文以广州东濠涌竖井基坑工程为对象,通过有限元数值模拟和监测数据的对比,分析基坑开挖过程中高架桥桩基的位移和附加弯矩变化情况。并分析不同影响因素下高架桥桩身位移和弯矩的变化特性,得到桩身位移随着桩基与基坑距离和桩身直径的增大而减小,弯矩随着桩基与基坑距离减小而减小,随着桩身直径增大而增大等结论,为类似工程提供参考。

The displacement field and stress field of the adjacent pile foundation in foundation pit excavation has become a hot spot of concern. This article, taking the Donghaoyong shaft project in Guangzhou as the object, analyzes the displacement and additional bending moment of the pile foundation during the foundation pit excavation through finite element numerical simulation and monitoring data comparison. This paper analyzes the variation characteristics of the displacement and bending moment of the viaduct pile under different influencing factors. In conclusion, the displacement of the pile foundation decreases with the distance between the pile foundation and the foundation pit and the diameter of the pile body. The bending moment decreases with the decrease of the distance between the pile foundation and the foundation pit, and increases with the diameter of the pile body. The results will be referenced for similar projects in the future.