基于沉降控制的超长桩有效桩长的确定  

Determination of Critical Pile Length for Super-Long Pile Based on Settlement Control

作　　者：夏力农[1,2] 苗云东[1] 朱惠民[2] 

机构地区：[1]湘潭大学土木工程与力学学院,湖南湘潭411105 [2]长沙学院土木工程系,湖南长沙410003

出　　处：《湘潭大学自然科学学报》2010年第3期44-47,54,共5页Natural Science Journal of Xiangtan University

基　　金：长沙市科技计划项目;长沙学院引进人才科研基金

摘　　要：Cooke的剪切变形传递法的基本假定与超长桩的实际工作性状吻合良好.在分析超长桩荷载传递特点的基础上,以基桩沉降为控制目的,按照剪切变形传递法分析了超长桩的有效桩长.对于常用的设计指标,提供了设计图表.结果表明,摩擦桩的有效桩长与桩土的弹性模量比有很大关系,比值越长,有效桩长就越长,另外,桩径对于有效桩长也有影响,桩径越大,有效桩长就越长.Based on the analysis of character of load-transfer of super-long pile,for the purpose of pile settlement control,critical pile length for single friction pile was determined by Cooke＇s shear deformation-transfer model,because the assumption of Cooke＇s model is similar with working condition of super-long pile.The design chart is provided for normal design index.The results show that critical pile length is greatly concerned with ratio of Young＇s module of pile and soil,the greater the ratio is,the longer the critical pile length is.In addition,pile diameter also affects the critical pile length,the larger the diameter is,the longer the critical pile length is.

关 键 词：超长桩 沉降控制 有效桩长 剪切变形传递 

分 类 号：TU473.1[建筑科学—结构工程]