高速公路工程中粉喷桩复合地基最大侧向变形研究  

Maximum lateral deformation of dry mixing column composite foundation in expressway engineering

作　　者：邓永锋[1] 刘松玉[1] 洪振舜[1] 

机构地区：[1]东南大学交通学院,南京210096

出　　处：《岩土力学》2005年第4期604-607,共4页Rock and Soil Mechanics

基　　金：教育部博士点基金项目资助(No.2001028618);东南大学优秀博士学位论文基金资助(No.YBJJ0411)

摘　　要：分析了粉喷桩复合地基路堤填筑过程中最大侧向变形发展的特性,确定了坡脚处最大侧向变形与路中沉降呈双直线的关系,坡脚处最大侧向变形在大部分填筑过程中与路中沉降呈=Sy d/d m0.115的关系。对比分析了粉喷桩复合地基和天然地基侧向变形发展规律的差异,并基于复合地基理论分析,认为导致它们差异变化的原因是粉喷桩复合地基桩-土应力分担比的变化。This paper investigated the relationship between the maximum lateral deformation and the vertical settlement of dry mixing column composite foundation under embankment loads. The relationship is a bilinear one which is the same as that reported for natural soft ground. But for the dry mixing column composite foundation, the incremental ratio of maximum lateral deformation over vertical settlement at the second stage is much smaller than that at the first stage. This result is contrary to that reported for natural soft ground under embankment loads. The reason responsible for the difference is contributed to the change in the stress ratio of pile to soil. The analysis also indicates that the deformation of the second stage mainly controls the construction quality of embankment for the dry mixing column composite foundation. Based on the compiled data of dry mixing column composite foundation, the incremental ratio of maximum lateral deformation over vertical settlement at the second stage is about 0.115.

关 键 词：粉喷桩 复合地基 侧向变形 桩土应力比 

分 类 号：TU473[建筑科学—结构工程]