桥梁抬桩钻孔施工对临近旧桩的影响分析  

The Impact Analysis of Drilling Piles Reinforcement Construction on the Near Old Pile

作　　者：李传生 周欢 周华威 朱慈祥 LI Chuansheng;ZHOU Huan;ZHOU Huawei;ZHU Cixiang(Anhui Expressway Company Limited, Hefei 230088, China;CCCC Road & Bridge Special Engineering Co., Ltd., Wuhan 430071, China)

机构地区：[1]安徽皖通高速公路股份有限公司,合肥230088 [2]武汉二航路桥特种工程有限责任公司,武汉430071

出　　处：《交通科技》2019年第5期47-51,共5页Transportation Science & Technology

基　　金：2016年度安徽省交通科技进步计划项目资助

摘　　要：以桥梁抬桩加固施工为背景,采用有限元分析方法,研究了旧桥新增钻孔桩施工过程对既有邻近桩基与及周边土体内力和变形的影响及其规律,得出了旧桩桩身弯矩、剪力、位移,以及周边土体应力、位移的变化规律。结果显示,开挖初期桩身位移较小,新桩钻孔穿出钢护筒后,桩身最大弯矩位置逐渐下移直至稳定,最大剪力显著增大,桩基及土体应力波动明显。In reference to the construction of bridge foundation reinforcement with adding pile, the effect and rule of the newly added bored pile construction process on the internal forces and deformations of the existing adjacent pile foundations and the surrounding soil are studied. The law of change in bending moment, shear force, displacement of the old pile body and the stress and displacement of the soil around are obtained. The results show that the deformation of pile body is small at the initial stage of excavation. The maximum bending moment position is moved gradually down until it comes to a stable value, the maximum shear is significantly increased, the stress fluctuation of pile and soil is changed obviously.

关 键 词：桩基加固 新桩开挖 邻近旧桩 变形规律 

分 类 号：U445.6[建筑科学—桥梁与隧道工程]