CAJ | 학술논문

静钻根植竹节桩是由预应力竹节桩和桩周水泥土构成的一种新型组合桩基，该新型桩不仅承载性能较好，而且可以大量减少桩基施工过程中所产生的泥浆污染。通过静钻根植竹节桩和钻孔灌注桩的静荷载对比试验及埋设在竹节桩桩身上的应变计对桩身轴力进行测量，分析了静钻根植竹节桩桩身的轴力分布情况以及侧摩阻力的分布，用有限元软件ABAQUS对静钻根植竹节桩进行三维建模计算，详细地分析这种新型组合桩的荷载传递机制。结合现场试验与模拟计算可以得到：在软土地区，静钻根植竹节桩这种新型组合桩的承载力比普通钻孔灌注桩要高；静钻根植竹节桩桩身变形由预制桩所控制，竹节桩与桩外围水泥土近似变形协调；竹节桩竹节的存在对组合桩承载性能有着极其重要的作用；在软土中静钻根植桩侧摩阻力是灌注桩侧摩阻力的1.05～1.10倍。
정찬근식죽절장시유예응력죽절장화장주수니토구성적일충신형조합장기，해신형장불부승재성능교호，이차가이대량감소장기시공과정중소산생적니장오염。통과정찬근식죽절장화찬공관주장적정하재대비시험급매설재죽절장장신상적응변계대장신축력진행측량，분석료정찬근식죽절장장신적축력분포정황이급측마조력적분포，용유한원연건ABAQUS대정찬근식죽절장진행삼유건모계산，상세지분석저충신형조합장적하재전체궤제。결합현장시험여모의계산가이득도：재연토지구，정찬근식죽절장저충신형조합장적승재력비보통찬공관주장요고；정찬근식죽절장장신변형유예제장소공제，죽절장여장외위수니토근사변형협조；죽절장죽절적존재대조합장승재성능유착겁기중요적작용；재연토중정찬근식장측마조력시관주장측마조력적1.05～1.10배。
The static drill rooted nodular pile is a new type of composite pile foundation which consists of precast nodular pile and the cemented soil along the pile shaft. This kind of composite pile has a good bearing capacity, and the mud pollution will largely be reduced in its construction process. A group of experiments were conducted to provide a comparison between this composite pile and the bored pile. The axial force of the nodular pile was measured by the strain gauges attached on the pile shaft to analyze the distribution of the axial force and the skin friction along the shaft; and then a three-dimensional model was built by using the ABAQUS finite element program to investigate the load transfer mechanism of this composite pile in detail. The results of the field tests and ABAQUS simulation showed that:the bearing capacity of the static drill rooted nodular pile is better than that of the bored pile in soft soil area. The settlement of the composite pile is controlled by the precast pile, and the deformation of the precast pile and the cemented soil can be considered as deformation compatibility. The nodes on the nodular pile play an important role during the load transfer process;and the skin friction of the static drill rooted nodular pile is about 1.05-1.10 times of the skin friction of the bored pile in the same soil layer.