刚-柔性桩复合地基荷载分担比研究  

Load sharing ratio of composite foundation with rigid-flexible piles

作　　者：朱奎[1] 徐日庆[1] 吴冬虎 周鹏飞[3] 

机构地区：[1]浙江大学土木工程学系,浙江杭州310027 [2]温州市民用建筑规划设计所,浙江温州325000 [3]温州大学,浙江温州325000

出　　处：《浙江大学学报（工学版）》2008年第2期359-363,共5页Journal of Zhejiang University：Engineering Science

基　　金：浙江省建设厅科研项目(20050568);温州市科技技术局资助社会发展项目(S2005A013);温州市瓯海区科技技术局资助社会发展软课题(200522)

摘　　要：为了分析刚-柔性桩复合地基的荷载传递机理,基于弹性计算模型,根据刚-柔性桩复合地基的荷载与沉降关系,通过理论推导获得了荷载分担比的解析解,该解析解全面考虑了褥垫层、刚性桩、柔性桩、地基土的性质、面积置换率等影响因素.根据有限元数值模拟结果,对影响荷载分担比的各因素分别进行拟合,建立了荷载分担比简单实用的拟合公式.对比研究发现,荷载分担比的解析解与实测结果吻合较好,拟合公式具有一定的地区性,但总体上可以满足工程要求,可以通过积累各地区的试验参数对该公式进行适当的修正.In order to analyze the load transferring mechanism of the composite foundation with rigid-flexible piles, the theoretical solution of load sharing ratio was obtained based on the elastic calculation model according to the relationship between load and settlement of composite foundation with rigid-flexible piles. The theoretical solution completely considers the influencing factors such as cushion, rigid pile, flexible pile, soil characteristics and area replacement ratio. The influences of various factors on the load sharing ratio were separately fitted, and a simple empirical formula was established according to the simulation resuits of finite element method. Comparison showed pronounced agreement between the theoretical solution and the in-situ test result. The fitting formula is restricted to specific area but can generally meet the engineering need. It is suggested that the formula could be amended appropriately based on the accumulation of regional test parameters.

关 键 词：刚-柔性桩复合地基 荷载分担比 解析解 拟合公式 原位测试 

分 类 号：TU473[建筑科学—结构工程]