摘要
通过建立三维数值模型,对地面超载条件下自由场土体侧向位移模式进行了探讨,得出了土体侧向变形规律。在此基础上,建立了地面堆载条件下对邻近桩基影响的实用计算模式,将被动桩分为受土体位移作用的被动部分和受土体抗力作用的主动部分分别考虑,以Itos土压力为依据,考虑土体的实际分层和被动区侧移土体成拱效应,计算被动部分桩侧土压力,主动侧作用于桩身上的土体抗力与桩的变形成正比。通过桩的平衡建立位移协调方程,采用有限差分法求解建立的微分方程,最后通过一个工程实例对被动桩实用计算方法进行了验证。
3D finite element method is adopted to analyze lateral deformation mode of soils in the free field state.On this basis,a computation model is set up to analyze passive piles subjected to adjacent surcharge loads.In the computation model,passive piles are divided into passive parts subjected to soil deformation induced by adjacent surcharge loads and active parts resulted from passive loads.The passive parts of passive piles are calculated according to the Itos soil pressure theory considering the layered soils and the arching effect of lateral displacement soils in passive parts.The active parts of passive piles are calculated according to the traditional method considering soil resistance.The bending moment and deformation of passive piles are solved based on the displacement compatibility differential equation by finite difference method.Finally practical calculation method brought forward is verified by an engineering example,in the paper.
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2010年第S1期128-134,共7页
Chinese Journal of Geotechnical Engineering
关键词
堆载
被动桩
计算模式
数值分析
surcharge load
passive pile
calculation model
numerical analysis
