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为研究红粘土复合地基中CFG桩的变形特性,在CFG桩内埋设混凝土应变计进行监测,结合室内土工试验,分析了红粘土复合地基中CFG桩桩身不同部位应变随荷载、时间的变化规律及其内在作用机理。结果表明:CFG桩在施加上覆荷载之前就存在初始内应力,桩顶下一定部位存在一初始应变零点;红粘土的膨胀性对CFG桩桩体变形有重要影响,复合地基需要较长的时间进行内部变形调整;变形稳定后,桩体中存在两个应变零点,拉压区域交替出现。
In order to study the deformation characteristics of CFG piles in the red clay composite foundation, the concrete strain gages were embedded in the CFG piles for monitoring. Combined with the indoor geotechnical test, the variation of strain with load and time in different parts of CFG piles in red clay composite foundation was analyzed And its intrinsic mechanism. The results show that initial stress exists in CFG pile before overburden load and there is an initial strain zero point in certain place under pile top. Expansibility of red clay has an important influence on deformation of pile body, and the composite foundation takes a long time After the deformation is stabilized, there are two strain zero points in the pile body, and the tension-compression zone alternates.