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通过对16个场地中共36根桩的现场试验资料的分析,对比研究大直径超长桩桩身总侧阻力与端阻力的承载性状,研究发现:桩身总侧阻力、端阻力在初始阶段是异步发挥的,侧阻力先发挥,然后两者就开始同步发挥,同步发挥是主要过程,两者发挥的差异主要表现在时间、增幅、绝对值大小等方面。与端阻力一样,桩身总侧阻力达到极限状态时的桩顶沉降值没有确定值,与Vesic认为的以桩顶沉降10 mm来确定有区别,说明桩身总侧阻力达到极限状态时的桩顶沉降值受土的类型、桩的几何尺寸、施工方法等因素综合影响;侧阻力达到极限状态的12根桩中有4根桩的侧阻力存在软化现象,而端阻力一般没有软化现象;桩端岩土强度的提高,不仅可大幅度提高端阻力,同时也可大幅度提高桩身总侧阻力。
Through the analysis of the field test data of 36 piles in 16 sites, the bearing capacity of the total lateral resistance and the end resistance of the pile with large diameter is compared and analyzed. It is found that the total lateral resistance and the end resistance of the pile are in the initial stage Asynchronous play, the first resistance to play, then the two began to play simultaneously, simultaneous play is the main process, the difference between the two mainly in the time, increase, the absolute size of the other aspects. As with the end resistance, there is no definite value for the settlement of the top of the pile when the total lateral resistance of the pile reaches the limit, which is different from that of Vesic’s opinion that the settlement of the top of the pile is 10 mm, indicating that the pile The top settlement value is affected by the type of soil, the geometry of the pile, the construction method and other factors. The lateral resistance of four piles of 12 piles with lateral resistance softens, while the end resistance does not soften. The improvement of end rock strength can not only greatly improve the end resistance, but also greatly improve the total lateral resistance of the pile.