PHC管桩荷载传递的试验研究和数值分析  

Testing and numerical analysis of load transfer mechanism of PHC pile

作　　者：律文田[1] 王永和[1] 冷伍明[1] 

机构地区：[1]中南大学土木建筑学院,长沙410075

出　　处：《岩土力学》2006年第3期466-470,共5页Rock and Soil Mechanics

摘　　要：通过在预应力高强混凝土管桩(PHC桩)的桩顶、桩端及桩周各主要土层的分界面埋设应变计的静荷载试验,研究了PHC管桩的荷载传递机理,分析了轴力和桩侧摩阻力的变化规律。并以工程中PHC管桩的竖向抗压静载试验为基础,运用有限单元法对软土地区的PHC管桩桩-土相互作用进行模拟,在分析中采用弹塑性模型,引入了非线性接触面单元,并且考虑了土体的材料非线性。分析结果表明,计算值和实测值有一定的差别,但是变化趋势基本一致。Base on the static loading tests on prestressed high-strength concrete piles with strain gauges at the top and toe of pile and at interfaces of soil layer, the load transfer mechanism of PHC piles was studied; and the behaviors of skin resistance and inner force were analyzed. Based on the static load test on prestressed high-strength concrete piles （PHC piles） of a practical engineering, using the elastoplastic model, nonlinear interface elements and nonlinear soil elements, by the finite element method, pile-soil interaction of PHC pile in the soft soil area were simulated. The results of analysis indicate that there are many differences between the numerical predictions and the experimental results; however, it shows that the calculated distribution trend is in good agreement with the experimental results.

关 键 词：PHC管桩 有限单元法 荷载传递机理 桩侧摩阻力 

分 类 号：TU473[建筑科学—结构工程]