刚性基础下柔性桩复合地基有效桩长的一种改进算法  

Improved Calculation Method for Effective Length of Flexible Piles for Composite Foundation with Rigid Foundation

作　　者：肖耀廷 党发宁[2] 贵襄军[3] 

机构地区：[1]湖北文理学院土木工程与建筑学院,湖北襄阳441053 [2]西安理工大学岩土工程研究所,陕西西安710048 [3]襄阳市第二建筑设计院,湖北襄阳441000

出　　处：《湖北文理学院学报》2018年第2期22-26,共5页Journal of Hubei University of Arts and Science

基　　金：湖北省教育厅科研计划项目(B2016167)

摘　　要：将复合地基中所受的桩顶力和桩间土顶力分开进行计算,利用桩体微分方程求解桩顶位移;基于剪切位移传递法求解侧摩阻力作用下桩间土顶沉降;采用JGJ79-2012《建筑地基处理技术规范》中关于复合地基沉降的方法计算土顶荷载作用下桩间土的沉降.针对黏土地基问题,根据刚性基础下柔性桩复合地基的变形条件,并考虑土顶荷载作用,提出一种考虑置换率和桩土模量比等因素的柔性桩复合地基有效桩长的计算方法.通过与前人研究成果的对比,结果表明该算法计算精度有比较大的改进.The stress of composite foundation is calculated individually under the action of pile top force and soil top force. Displacement of pile top is solved according to differential equation of pile; based on shearing displacement method,displacement of inter-pile soil top is solved under the action of frictional force in side-pile; according to Technical Code For Building Foundation Treatment（JGJ79-2012）,displacement of inter-pile soil top is solved under the action of force in soil top. Using deformation condition of flexible pile for composite foundation with rigid foundation and consideration of the action of force in soil top,this paper raise an improved calculation method for effective length of piles which considered the factors of replacement rate and pile-soil modulus ratio. Through comparing with the method in this paper and previous researches,the validity of the method is illustrated.

关 键 词：复合地基 有效桩长 桩土应力比 桩土模量比 

分 类 号：TU43[建筑科学—岩土工程]