沿海潮汐环境下灌注桩负摩阻力产生机理  

Generation mechanism of negative skin friction for cast-in-place piles in offshore tidal environment

作　　者：吴继敏[1] 魏继红[2] 杜金新[2] 彭森良[2] 冯贤[2] 

机构地区：[1]河海大学科学研究院,江苏南京210098 [2]河海大学土木工程学院,江苏南京210098

出　　处：《河海大学学报（自然科学版）》2009年第3期299-303,共5页Journal of Hohai University(Natural Sciences)

摘　　要：对欠固结饱和软黏土环境中灌注桩负摩阻力的产生条件和产生机理进行分析.在考虑沿海潮汐环境下灌注桩双中性点产生机理的基础上,得出双中性点的产生条件,推导了双中性点条件下桩侧负摩阻力的解析解;针对双中性点出现的边界条件,在假设负摩阻力随桩体深度呈双曲线形式变化的基础上,推导了总负摩阻力的计算表达式.The generation conditions and mechanism of negative skin friction for the cast-in-place piles in underconsolidated saturated soft clay were analyzed. Based on the generation mechanism of the two-neutral point of the cast-in-place piles in an offshore tidal environment, the generation conditions for the two-neutral point were proposed. The analytic solutions for the lateral negative skin friction of the two-neutral point were deduced. The equation for the total negative skin friction was derived under the occurring boundary conditions of the two-neutral point and on the basis of the hypothesis of the hyperbolic curve for the negative skin friction of piles with depth.

关 键 词：灌注桩 负摩阻力 双中性点 潮汐环境 

分 类 号：TU473.1[建筑科学—结构工程]