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对天津滨海地区76m钻孔灌注桩承载机理进行了研究,分析了其荷载传递机理及桩侧摩阻力和桩端阻力在总承载力中的发挥比重。研究结果表明:天津滨海地区超长钻孔灌注桩基本属于摩擦型桩,桩端阻力发挥比重很小;按照规范估算的桩侧摩阻力较小而桩端阻力较大,与实际两者发挥程度不符;合理的估算桩侧摩阻力及桩端阻力,不仅有利于基础的优化设计而且还将带来一定的经济效益。
The bearing mechanism of 76m cast-in-place bored pile in Tianjin coastal area was studied. The load transmission mechanism and the proportion of pile-side friction and pile-end resistance in the total bearing capacity were analyzed. The results show that the ultra-long bored piles in Tianjin coastal area are basically friction-type piles, and the proportion of pile-tip resistance exertion is very small. The pile-side frictional resistance is small and the pile-end resistance is large according to the specifications, Inconsistent; a reasonable estimate of pile side friction and pile resistance, not only conducive to the foundation of the optimal design but also will bring some economic benefits.