摘要
负摩阻力问题广泛存在于新建填土地区的桩基工程中,对桩基础承载特性产生较大的影响。基于有效应力法和桩侧摩阻力发挥机理,建立单桩负摩阻力计算的分段模型;通过桩土体系的变形假设和静力学平衡方程,确定桩侧摩阻力分段区间及中性点位置;利用位移和桩截面轴力控制方程,推导分段区间内桩身位移及轴力解析解。验证结果表明:桩侧负摩阻力的传递特征及分布范围可以通过计算公式确定。
Negative skin friction problems of the pile foundation engineering widely exist in the new fill area. A thorough study of the calculation methods are of important practical significance. The piecewise calculation model of negative skin friction is established based on the effective stress method and pile skin friction occurring mechanism. According to the deformation assumption and the static equilibrium equation of the pilesoil system, pile side friction of piecewise interval and neutral point position are determined. The displacement and pile axial force control equation are used to derive a piecewise interval pile displacement and axial force of the analytical solution. Based on the engineering example, the rationality of the results is verified. The results show that the method can accurately describe the transmission characteristics and distribution range of negative skin friction, and the calculation parameters are easy to obtain. The results are of significant reference significance in the practical engineering.
作者
马露
王钰轲
于敏
王伟
徐晓阳
MA Lu WANG Yuke YU Min WANG Wei XU Xiaoyang(College of Architecture, University of science ＆ technology of Anhui, Fengyang, Anhui 233100, China College of Water conservancy and Environmental Engineering, Zhengzhou University, Zhengzhou, Henan 45000, China Department of Civil ＆ Environment Engineering, National University of Singapore, Kent Ridge 117576, Singapore Department of Civil Engineering, Shaoxing University, Shaoxing, Zhejiang 312000, China)
出处
《水文地质工程地质》
CAS
CSCD
北大核心
2017年第1期71-77,共7页
Hydrogeology & Engineering Geology
基金
安徽高校自然科学研究重点项目资助(KJ2016A181)
安徽科技学院高层次人才科研启动项目资助(ZRC2014464
ZRC2014465)
国家留学基金资助项目(201607910002)
浙江省自然科学基金项目资助(Y17E080066)
住房和城乡建设部科学技术项目(2015-k4-003
2016-k5-008)
关键词
桩基础
负摩阻力
有效应力法
桩土相互作用
pile foundation
negative skin friction
effective stress method
pile-soil interaction
