摘要
根据竖向荷载作用下的桩-土相互作用机理,并考虑桩侧土体应力-应变的非线性特征,建立了基桩沉降的简化计算模型,计算了基桩沉降的理论值。以湘府路高架桥ZX49R墩中的基桩为工程实例,通过对比分析基桩沉降实测值和计算值,验证了用荷载传递法计算基桩沉降的合理性,探讨了桩径和桩长对基桩沉降的影响。研究结果表明:当其他条件相同时,基桩沉降随桩径和桩长的增大均呈非线性减小趋势,随桩顶竖向荷载的增加呈非线性增大趋势。增大桩径和桩长均能在一定程度上减小基桩竖向受荷沉降,但当其增大到一定程度后,桩径和桩长已不再是控制桩顶沉降的关键参数,以期为桩基工程的设计提供参考。
According to the mechanism of pile-soil interaction under vertical load,a simplified calculation model for foundation pile settlement was established considering the nonlinear characteristics of soil stress and strain on the pile side.The theoretical solution of foundation pile settlement calculation was derived.Taking the foundation pile in ZX49R pier of Xiangfu road viaduct as an engineering example,the calculated settlement value of foundation pile using the load transfer method was verified by measured value,and the influence of pile diameter and pile length on foundation pile settlement was discussed.The results show that the settlement of foundation pile decreases with the increase of pile diameter and pile length,and increases with the increase of vertical load on pile top.The vertical settlement under load can be significantly reduced by increasing the pile diameter and pile length.However,when certain point is reached,the vertical settlement is impacted slightly by pile diameter and length.This study is considered to provide reference for the design of pile foundation engineering.
作者
胡超
HU Chao(Hunan Xiangjiang New Area Development Group Co.,Ltd.,Changsha 410205,China)
出处
《交通科学与工程》
2020年第2期98-103,共6页
Journal of Transport Science and Engineering
关键词
桩基
沉降
荷载传递法
双曲线函数
敏感性分析
pile foundation
settlement
load transfer method
hyperbolic function
sensitivity analysis
