摘要
根据实际工程,结合土岩组合地基中抗拔桩现场试验,通过FLAC3D数值模拟软件建立了合理的数值模型,定义抗拔桩破坏模式系数P(i=嵌岩深度/桩长,范围0～1),研究了不同桩长的抗拔桩在完全嵌土、完全嵌岩以及土岩组合地基中的桩顶位移及破坏模式。研究结果表明:1)数值模拟和现场试验对比分析可知,本文建立的抗拔桩模型是安全的、可靠的和合理的; 2)完全嵌土时,抗拔桩发生圆柱破坏、完全嵌岩时,抗拔桩发生倒圆锥破坏;土岩组合时,抗拔桩发生复合型破坏。随破坏模式系数的增大,其破坏模式先后发生圆柱型破坏、复合型破坏及倒圆锥破坏; 3)在不同地基中,相同条件下,抗拔桩的承载能力表现为完全嵌岩>土岩组合>完全嵌土。
According to actual engineering,combined with the soil rock uplift pile in composite foundation field test,through FLAC3 D numerical simulation software to establish the reasonable numerical model,definition of uplift pile failure mode coefficient of P( P = 0 ~ 1),to study the uplift pile embedded in a completely different pile lengths,completely embedded in rock and soil in the composite foundation pile top displacement and failure mode. The research results show that: 1) The comparison between numerical simulation and field test shows that the model established in this paper is safe,reliable and reasonable;2) When the soil is completely embedded,cylinder failure occurs to the pulling pile and obturation failure occurs to the pulling pile when the pile is completely embedded in rock. The composite failure of antipulling pile occurs when soil and rock are combined. With the increase of failure mode coefficient,the failure modes successively occur cylindrical failure,composite failure and inverted conical failure. 3) In different foundations,under the same conditions,the bearing capacity of the uplift pile is shown as complete embedded rock > soil-rock combination >complete embedded soil.
作者
刘梅
穆锐
Liu Mei;Mu Rui(School of Tourism and Aviation,Guizhou Minzu University,Guiyang 550025,China;School of Civil Engineering,Guizhou University,Guiyang 550025,China)
出处
《建筑结构》
CSCD
北大核心
2018年第S2期856-860,共5页
Building Structure
基金
贵州省科学技术基金项目(黔科合J字[2015]2037号)
