厚承台下的桩顶应变异常规律及其解释  

Abnormal Rule and Explanation of Pile Top Strain under Thick Pile Cap

作　　者：唐勇[1] 

机构地区：[1]福建省建筑科学研究院,福州市350025

出　　处：《勘察科学技术》2011年第5期5-7,共3页Site Investigation Science and Technology

基　　金：国家重点基础研究发展计划(973计划)(2002CB412707)

摘　　要：苏通大桥主塔墩基础是由131根钻孔灌注桩组成的群桩基础,其承台采用厚承台形式。实测数据表明,厚承台下的桩顶应变规律具有特殊性,即多数桩的桩顶应变呈现一侧受压一侧受拉的特性。该文利用有限元法对这一规律进行了解释,并推导了厚承台下的桩顶实测轴力计算公式。The main pylon foundation of Sutong bridge is pile-group foundation composed by 131 bored piles, and the pile cap uses thick pile caps form. The measured datum show the strain regularity of pile top under the thick pile cap has special, that is, the regularity of majority piles top strain present that one side is compressed, the other is pulled. In the paper the regularity is illustrated by finite element method, and the formula for calcu- lating the measured pile top axial force under the thick pile cap is derived.

关 键 词：苏通大桥 厚承台 应变异常 轴力 

分 类 号：TU473.1[建筑科学—结构工程]