基坑开挖对邻近桥梁桩基的影响与加固分析  

Behaviors and Strengthening of Bridge Piles Subjected to Excavation-induced Soil Movement

作　　者：王恒[1] 陈福全[1] 林海[1] 

机构地区：[1]福州大学土木工程学院,福州350108

出　　处：《地下空间与工程学报》2015年第5期1257-1265,共9页Chinese Journal of Underground Space and Engineering

摘　　要：基坑开挖引起的环境效应越来越受到重视,特别是基坑开挖对邻近桥桩的影响。以厦门地区某水闸深基坑工程为背景,采用有限元软件建立三维数值分析模型,研究水闸深基开挖时邻近桥梁桩基的响应性状,对土体采用HS本构模型模拟,考虑桩土相互作用,桥桩采用Embedded桩单元模拟。分析了桩基两侧土体明显的位移,对比二维与三维得到的结果,验证了大间距桩基二维等效是合理可行,归纳总结二维简化分析注意的事项,提出了相应的加固措施,取得了基坑施工与邻近桩基相互影响的基本认识,可为数值模拟在基坑工程中的应用提供借鉴。Environmental effects caused by excavation attracts more and more attention,especially the influence of excavation on adjacent bridge piles. Based on the deep foundation pit of a sluice in Xiamen,three dimensional numerical analysis are performed to simulate the process of excavation and the behaviors of adjacent piles are studied. Considering the soil behaviors and the interactions between piles and soils,the embedded pile model is used to model the pile behavior,and the Hardening-Soil model is adopted for soils. The effects of lateral soil movement on the both sides of a pile are serious. Compared with 2D and 3D results,it is shown that the large spacing of pile foundation plane equivalent is reasonable,several issues that should be paid attention to in the plane equivalent are investigated. Finally the corresponding reinforcement measures are put forward. Through this study, the basic knowledge of the interaction between the excavation and the adjacent piles are initially obtained. It provides a reference for the application of numerical simulation in the foundation pit engineering and has the practical significance.

关 键 词：基坑开挖 桩基加固 邻近桥桩 数值分析 

分 类 号：TU443[建筑科学—岩土工程]