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由于施工场地条件的限制,大直径深嵌岩短桩在桥梁工程中得到了使用,而相应的原位试验研究比较缺乏。该文基于自平衡试桩法,对大直径深嵌岩短桩的承载特性进行了分析与研究,主要内容包括桩身轴力的分布形态、桩侧阻力与位移关系、桩端阻力与位移关系以及桩侧阻力桩端阻力分担比等。研究结果表明:大直径深嵌岩短桩其桩身轴力分布主要集中在嵌岩段部分且轴力的变化幅度较为显著,而上部上覆土层的轴力变化较小且数值较小;从桩侧摩阻力分布来看,深嵌岩短桩桩侧阻力也主要集中在嵌岩段部分且数值较大;最后对自平衡试桩法所获得的Q-s曲线进行了比较分析,研究发现:在软岩地区大直径深嵌岩短桩与一般的大直径深嵌岩长桩明显不同,其Q-s曲线出现了明显的弯曲段。
Due to the restriction of the construction site conditions, large-diameter deep-buried rock short piles have been used in bridge engineering, and the corresponding in-situ experimental research is relatively lacking. Based on the self-balancing test-pile method, the bearing characteristics of large-diameter deep-buried rock short piles are analyzed and studied. The main contents include the distribution of pile axial force, the relationship between pile-side resistance and displacement, As well as pile end resistance pile end resistance sharing ratio. The results show that the axial force distribution of deep-buried rock-socketed short piles mainly concentrates in the section of embedded rock and the variation of axial force is significant, while the axial force of the upper overburden changes little and has a small value. Side frictional resistance distribution of pile side view, the resistance of deep embedded rock short pile is also mainly concentrated in the embedded rock section and the larger the value; Finally, the self-balance test pile method Qs curves were compared and analyzed, the study found that: in The large-diameter deep-socketed short piles in soft rock area are obviously different from the general large-diameter deep piles embedded in rock, and the obvious curve section appears on the Qs curve.