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为研究超长桩在桩端与桩侧阻力之间的相互作用关系,设计实施了超长桩室内模型试验,分析了模型桩在不同桩顶载荷下载荷与沉降的关系、桩身轴力随深度的变化、桩侧摩阻力随深度的变化以及桩顶载荷与桩端土压力的关系.研究结果表明:超长桩桩侧摩阻力发挥作用的主要部位在桩身上部以及桩底以上10 d范围内,桩身中部侧摩阻力相对较小;当桩顶载荷达到1 039 N时,桩端阻力和桩侧阻力在桩端附近均出现增强现象.
In order to study the interaction between the pile tip and the pile side resistance, an ultra-long pile interior model test was designed and implemented. The relationship between load and settlement of the pile under different pile top loads was analyzed. The variation of depth, the variation of pile-side friction with depth, and the relationship between pile-top load and pile-top soil pressure are studied.The results show that the main part of the frictional effect of long piles is on the top of piles and 10 d Within the range, the lateral friction of the middle of pile body is relatively small. When the pile top load reaches 1039N, the pile end resistance and pile side resistance all appear to increase near the pile end.