路堤下刚性桩复合地基的设计计算方法研究  

Design and calculation method for rigid pile composite foundation under embankments

作　　者：何宁[1] 娄炎[1] 

机构地区：[1]南京水利科学研究院岩土工程研究所,江苏南京210024

出　　处：《岩土工程学报》2011年第5期797-802,共6页Chinese Journal of Geotechnical Engineering

摘　　要：路堤下刚性桩复合地基中填土在桩与桩间土之间发生了不等的沉降变形,导致路堤土产生拱效应;桩身受力分布随中性点的变化而改变,使得复合地基分层沉降和总沉降变形发生改变。根据土力学基本原理,结合已有刚性桩复合地基的桩、土压力、桩身荷载传递的研究成果,提出了刚性桩复合地基的设计计算方法,通过对工程实例的验证,计算结果比较合理,与工程实例实测结果吻合较好,可以满足工程设计需要。Differential settlement occurs in the fill between piles and soils in rigid pipe composite foundation,resulting in the occurrence of soil arch effect in the embankments.The distribution of forces acting on the piles changes with the variation of the neutral point,and it leads to variation of the layerwise settlement and the total settlement of the composite foundations.According to the fundamental principles of soil mechanics,a design method for the rigid pipe composite foundation is proposed based on the research achievements of forces acting on piles,earth pressures and load transfer mechanism of piles for the existing pile-supported rigid composite foundations.Through the validation by engineering cases,the calculated results are rational and agree with the observed ones and may satisfy the demand of project design.

关 键 词：路堤 复合地基 土拱效应 桩身荷载传递 沉降变形 

分 类 号：TU473[建筑科学—结构工程]