双向增强体复合地基桩土应力比分析  

Analysis of pile-soil stress ratio for double reinforced composite ground

作　　者：陈昌富[1] 周志军[1] 

机构地区：[1]湖南大学岩土工程研究所,长沙410082

出　　处：《岩土力学》2009年第9期2660-2666,共7页Rock and Soil Mechanics

基　　金：国家高新技术"863"项目(2006AA11Z104);湖南省科技攻关项目(02GKY3024)

摘　　要：针对双向增强体复合地基,由于桩体与桩间土变形不协调,导致路堤填土内部垂直变形有差异,应力状态发生变化。引入剪切位移法来分析路基填土中水平加筋体的变形和应力传递规律,在综合考虑填土力学性质(c,?)和水平加筋体作用的基础上,通过微元体平衡分析推导得到了桩土应力比、桩顶刺入量等计算公式。通过工程实例验证公式的可靠性,并综合分析了相关因素对桩土应力比的影响,得到了一些有益的结论。In the study of double reinforced composite ground, the settlements of pile and soil of composite ground are different, which results in vertical relative displacement in fill column and change in stress state. The shear displacement method is adopted to analyze the strain and stress of horizontal reinforcement. Equations about pile-soil stress ratio and distance of pile sticking into embankment are deduced from analyzing the vertical mechanical equilibrium of soil unit, in consideration of the influence of soil mechanical properties （c, φ） and horizontal reinforcement. Finally, when the equations are used to analyze the practical project, its feasibility is proved by the reasonable agreement between the calculated and the measured values; meanwhile, all kinds of factors that affected pile-soil stress ratio are analyzed systematically; and some rules are obtained.

关 键 词：复合地基 双向增强体 剪切位移法 桩土应力比 

分 类 号：TU47[建筑科学—结构工程]