桩基础非线性工作性状的室内模型试验分析  

Model Testing Analysis on Nonlinear Behavior of Piles Foundation

作　　者：张鹤年[1] 汤劲松[2] 何立明[1] 

机构地区：[1]南京工业大学,江苏南京210009 [2]石家庄铁道学院,河北石家庄050000

出　　处：《岩土工程技术》2005年第2期87-92,共6页Geotechnical Engineering Technique

基　　金：江苏省六大人才高峰基金首批资助项目 (5 12 130 2 8)

摘　　要：通过对单桩、带承台单桩和不同桩距群桩的模型试验结果分析 ,并与群桩试验的数值计算结果对比 ,总结了群桩中桩体的荷载传递规律 ;描述了板底土体反力和板下土体附加应力分布特性 ;比较了不同桩距群桩的荷载分担状况。通过试验结果的分析 ,得出桩的遮拦作用提高了承台下土体极限承载力的结论 ,为理论研究提供了试验依据 ;同时对桩的非线性工作状况进行分析 ,得出大桩距群桩受荷时桩先进入非线性然后承台下土体再进入非线性的结论。试验结果即验证了复合桩基非线性理论的若干假定 ,又为进一步研究提供了试验依据。Through the comparison of the model test result s and the numerical ana lysis, the loading transfer mechanism of pile in four?pile foundation is summar i zed, the back pressure characteristic of the cap and the additional pressure dis tribution in the soil are depicted, and the load sharing behavior of piles and s oil is compared. By the analysis of the tests results, the conclusion is drawn a s follows: the resist and strengthening action of piles in piles?soil?cap inte raction are proved by tests results; the pile shows a nonlinear working behavior b efore the soil turn into nonlinear working period. The tests results not only va lidate some aspects of the suppositions of the composite pile foundation theory, but also provide the proof for further research.

关 键 词：模型试验 非线性 应力场 位移场 荷载分担 桩的遮拦作用 复合桩基 

分 类 号：TU473.1[建筑科学—结构工程]