大型灌注桩桩土接触面法向作用力时空分布规律  

Time and Spatial distribution regularity of normal force at pile-soil interface of large-scale drilling pile

作　　者：李淼[1] 佴磊[1] 

机构地区：[1]吉林大学建设工程学院,长春130026

出　　处：《水文地质工程地质》2006年第4期20-22,共3页Hydrogeology & Engineering Geology

基　　金：吉林省交通厅科研项目资助(2003-1-13)

摘　　要：本文从桩土接触面法向作用力着手,应用工程实测资料,对大型钻孔灌注桩桩土接触面法向作用力时间和空间分布规律进行探讨,得出桩土接触面相互作用的法向应力随深度的增加而增大;对所测三个深度处应力值进行与时间关系的曲线拟合,得出桩土接触面法向作用力按σ=Ae-Bt+C规律递减,且当时间趋于无穷大时,稳定于C值;通过相关性分析,得出该法向作用力随时间变化的稳定值与深度相关程度很高,而与地层参数之间关系不大;应用有限元数值计算证实了实测数据分析结果的有效性。To study on the pile-soil interaction, this paper aimed at normal force at pile-soil interface, and used measured data of a certain project for time and spatial distribution regularity analysis of large-scale drilling pile. Conclusions were drawn that the normal force grows with the depth. The interaction force decreases with time according to function of σ=Ae^-Bt＋C, and finally comes to a constant C when time goes. Correlation analysis of coefficient C and its influence factors were carried out, which indicates that C is highly related to depth when no consideration of specific gravity and position＇s ratio. Furthermorc, FEM numerical analysis verified its validity of observed data.

关 键 词：灌注桩 桩土接触面 法向作用力 曲线拟合 

分 类 号：P631[天文地球—地质矿产勘探]