既有建筑桩基础再设计地基承载力和沉降计算方法的试验研究  

Experimental Study on Redesign of Pile Foundation

作　　者：李勇[1] 滕延京[1] 

机构地区：[1]中国建筑科学研究院地基基础研究所,北京100013

出　　处：《建筑科学》2011年第3期84-86,共3页Building Science

基　　金：国家"十一五"科技支撑计划项目(2006BAJ03A03-07)

摘　　要：为了研究既有建筑桩基础增层改造前后地基基础的工作性状,进行了与工程实际相符合的现场试验。通过一组单桩持载与不持载试验、一组四桩承台基础持载与不持载试验,对既有建筑桩基础在长期荷载作用下地基土的性状改变、再加载时Q～s曲线变化情况以及直接增层时地基承载力和沉降计算方法做了有益探索。In order to study the characteristics of pile foundation before and after rehabilitation of increasing story for existing buildings,a field test was done to consist with the engineering.By a volume of single pile and a volume of 4 piles foundation,tests were carried out under long – term sustained loading individually and by loading directly,and some significant research was done about the subsoil variance and the Q-s curve under long-term sustained loading,to explore the bearing capacity of foundation for the rehabilitation of existing buildings and the calculation method of the settlement.

关 键 词：桩基础 持载 Q^s曲线 

分 类 号：TU413.24[建筑科学—岩土工程]