摘要
针对目前JGJ94-2008《建筑桩基技术规范》关于桩基水平承载力计算中存在的水平抗力系数比例系数m取值模糊、未考虑黏性土黏聚力引起的表层土水平抗力影响等问题,根据常微分方程的幂级数解法,在考虑黏性土黏聚力引起的表层土水平抗力影响下,通过数学推导给出了双层土地基中的桩基水平承载力及变位计算解析通解。基于通解,利用Matlab软件给出了半刚性桩桩顶水平位移及转角的半解析计算式;同时,推导了由地基土抗剪强度指标c、φ计算其水平抗力参数的解析式,推求了新的桩基水平承载力计算式;在此基础上,给出了桩身最大弯矩处深度及最大弯矩值的简化计算式。依托于浙江省一桩基工程案例,运用研究的计算方法,对桩基水平承载力进行了计算,同时将计算结果与现场试桩的水平承载力检测值进行了验证对比。验证结果表明:根据地基土抗剪强度指标推求出的桩基水平承载力计算方法具有较强的工程应用价值。
In view of the problems in horizontal bearing capacity calculation of pile foundations in Technical Specification for Building Pile Foundations(JGJ94-2008),such as the fuzzy determination of the horizontal resistance coefficient proportional coefficient m, and the ignorance to surface soil horizontal resistance generated by the cohesion, the horizontal bearing capacity and displacement analytical analysis of the pile foundation in the double-layer soil foundation are given by power series solutions in ordinary differential equation.Based on the newly derived general solution, the semi-analytical formulas for the horizontal displacement and rotation of the semi-rigid pile top are calculated by using Matlab.And a new calculation formula for the horizontal bearing capacity of the pile foundation is derived based on the shear strength index c and φ,and a simplified calculation formula that calculate the depth and value of the maximum bending moment of the pile body is also given.Finally, relying on a pile foundation project in Zhejiang Province, the horizontal bearing capacity of the pile foundation is measured and compared with the values given in this paper.The verification shows that the proposed method on the horizontal bearing capacity of pile foundation has strong engineering application values.
作者
刘越
黄朝煊
LIU Yue;HUANG Chaoxuan(Zhejiang Design Institute of Water Conservancy and Hydroelectric Power,Hangzhou 310002,China)
出处
《人民长江》
北大核心
2022年第7期187-192,共6页
Yangtze River
基金
浙江省水利厅科技计划项目(RB2122,C2205)
国家自然科学基金项目(41641040)。
关键词
桩基水平承载力
地基土水平抗力系数
表层土水平反力
虚拟桩法
抗剪强度指标
解析解
多层软土地基
horizontal bearing capacity of pile foundation
horizontal soil resistance coefficient of ground soil
horizontal resistance force of ground soil
virtual pile method
shear strength index
analytical solution
multi-layered soft soil foundation
作者简介
刘越,男,高级工程师,主要从事岩土工程及地质勘察研究工作。E-mail:57362466@qq.com;通信作者:黄朝煊,男,高级工程师,硕士,国家注册土木工程师,主要从事水工结构及岩土工程设计与研究工作。E-mail:516227811@qq.com。