软土地基水平受荷桩基础力学性能研究  

Study on Mechanical Properties of Horizontal Load Pile Foundation in Soft Soil Foundation

作　　者：张凯[1,2] 刘旭锴 周燕[4] ZHANG Kai;LIU Xukai;ZHOU Yan

机构地区：[1]天津大学建筑工程学院,天津市300072 [2]天津市赛英工程技术咨询有限公司,天津市300072 [3]天津市市政工程设计研究院,天津市300191 [4]天津城建大学天津市土木建筑结构防护与加固重点实验室,天津市300384

出　　处：《城市道桥与防洪》2020年第5期253-256,265,M0025,M0026,共7页Urban Roads Bridges & Flood Control

基　　金：天津市自然科学基金项目(17JCYBJC22300,18JCQNJC08300);天津市应用基础与前沿技术研究计划(15JCYBJC48800);天津市企业博士后创新项目择优资助计划(2015-003);道路结构与材料行业重点实验室基金项目(310821171114);天津市交通运输科技发展计划项目(2014KYJJQL23)。

摘　　要：通过国内不同规范和文献的对比研究以及工程实例分析,建议以桩基地面水平位移达到6 mm的水平荷载作为桩基横轴向容许承载力,或者采用建筑桩基规范桩基水平承载力公式估算。考虑到软土地基桩土作用非线性的特点,引入了NL法对水平受荷桩内力和变形进行分析,建立了软土地基桩基在水平荷载作用下的精确分析方法;在相同的水平荷载作用下,采用m法计算的水平受荷桩变形值和内力值要比采用NL法计算的数值分别增大150%、15%左右,采用m法进行水平受荷桩设计时偏于保守。Through the comparative study of different domestic norms and literatures and the analysis of engineering cases,it is suggested that the horizontal displacement of pile foundation up to 6-mm horizontal load should be regarded as the allowable lateral axial bearing capacity of pile foundation,or the horizontal bearing capacity of pile foundation can be estimated by the formula of building pile foundation standard.Considering the nonlinear characteristics of pile-soil interaction in soft soil foundation,the NL method is introduced to analyze the internal force and deformation of horizontally loaded pile and an accurate analysis method of pile foundation in the soft soil foundation under the horizontal load effect is established.Under the same horizontal load effect,the deformation value and internal force value of the horizontally loaded pile calculated by the NL method are about 150%and 15%higher than the m method.The m-method is conservative in the design of horizontally loaded pile.

关 键 词：桩基 水平荷载 非线性地基反力系数 NL法 横轴向承载力 M法 

分 类 号：TU473.1[建筑科学—结构工程]