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为研究桩底沉渣对嵌岩桩承载性能的影响,开展室内模型试验。对试验数据进行分析,对比有、无沉渣的嵌岩桩的整体承载性能、桩端阻力及桩侧阻力的差别。结果表明:桩端沉渣严重影响嵌岩桩整桩的承载性能,有沉渣的嵌岩桩不仅极限承载力远低于无沉渣嵌岩桩,在相同荷载作用下,桩顶位移也远大于后者。桩端沉渣的存在不仅导致桩端几乎没有承载力,同时也严重影响了桩侧摩阻力的发挥,尤其是对桩端附近的摩阻力削弱较多。
In order to study the influence of pile bottom sediment on the bearing capacity of rock-socketed pile, indoor model test was carried out. The experimental data were analyzed to compare the overall bearing capacity of the rock-socketed pile with no sediment, the difference between the pile-end resistance and the pile-side resistance. The results show that the pile bottom sediment has a serious impact on the bearing capacity of the rock-socketed pile, the squealed rock-socketed pile not only has a lower ultimate bearing capacity than the rock-socketed pile with no sediment, but also displaces the pile top under the same load . The existence of pile-end sediment not only leads to almost no bearing capacity of the pile tip, but also seriously affects the pile-side frictional resistance, especially the friction near the pile tip is weakened more.