摘要
为了明确紧邻既有结构灌注桩施工力学行为,以典型工程实例为依托,借助数值法建立了灌注桩施工过程的三维模型,分析了桩基施工诱发的既有结构变形特性,并通过实测数据验证,同时探讨了桩基孔壁的稳定性。研究表明灌注桩施工过程中,虽采用钢护筒和泥浆护壁,但受钻孔开挖应力释放作用,依然产生了一定程度上的位移;基坑设计制定围护结构变形控制标准时,应考虑支护桩施工阶段的位移;桩基施工诱发的既有结构位移小于预警值,既有结构整体处于安全状态;实例钻孔桩设计的泥浆重度偏小,施工过程出现了孔缩和局部塌孔的现象。基于本文研究成果,及时调整了护壁泥浆重度,对于项目顺利实施提供了技术支持。
To clarify the mechanical behavior of bored pile construction adjacent to the existing structure,numerical analysis method was applied in this paper.A three-dimensional model of the construction process of bored pile was established based on a typical case of project.The deformation characteristics of the existing structure induced by the bored pileconstruction were analyzed and verified by the measured data.The stability of hole-wall is discussed.The results show that in the construction process of bored pile,the steel tube and mud wall are used,but in the process of drilling,the stress is released and some degree of displacement is produced.For the deformation control standard of supporting structure in foundation pit design,the displacement of supporting pile during construction stage should be considered.The displacement of the existing structure induced by pile foundation construction is less than the warning value,so the existing structure is in a safe and stable state.In the actual case,the slurry density of the bored pile design is small,so the phenomenon of hole shrinkage and hole collapse occurs in the construction process.Based on the research results of the paper,the slurry density of the wall protection is adjusted in time,and the technical support was provided for the implementation of the project.
作者
王雅甜
杨春山
黄福杰
WANG Yatian;YANG Chunshan;HUANG Fujie(School of Civil and Traffic Engineering,Guangdong University of Technology,Guangzhou 510006,China;Guangzhou Municipal Engineering Design & Research Institute Co.Ltd.,Guangzhou 510060,China)
出处
《南昌工程学院学报》
CAS
2022年第3期41-46,共6页
Journal of Nanchang Institute of Technology
基金
国家自然科学基金资助项目(51878192)
广东省自然科学基金资助项目(2020A1515011058)。
关键词
灌注桩
施工影响
变形特性
孔壁稳定性
数值分析
bored pile
construction influence
deformation characteristics
hole-wall stability
numerical analysis
