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为研究南京地区砂性土中预制管桩抗拔承载特性,基于8根抗拔管桩的现场单桩破坏性静载试验,对比分析采用JGJ94—2008规范公式、倒圆锥台破坏模型、复合剪切破坏面模型和圆柱形破坏模型等4种方法计算得的预制管桩抗拔承载力与实测承载力的关系;同时分别采用双曲线函数、指数函数及幂函数对所有试桩的荷载-位移曲线进行拟合分析。结果表明:采用JGJ94—2008规范公式计算所得的抗拔承载力明显小于实测值,而倒圆锥台破坏模型计算值又明显大于实测值,圆柱形破坏模型计算值接近实测值;指数函数拟合曲线与实测荷载-位移曲线吻合度较高,拟合效果较好。
In order to study the buckling bearing behavior of precast tubular piles in sandy soil in Nanjing area, based on the static single-pile destructive static load test of 8 pile exoskeleton piles, the JGJ94-2008 standard formula, inverted truncated cone failure model, Cut failure surface model and cylindrical failure model and other four kinds of methods to calculate the prestressed pipe pile pull-up capacity and measured bearing capacity; at the same time, respectively, using hyperbolic function, exponential function and power function of all test pile load-displacement Curve fitting analysis. The results show that the pull-out bearing capacity calculated by the formula of JGJ94-2008 is obviously smaller than the actual measured value, while the calculated value of inverted truncated cone failure model is obviously larger than the measured value. The calculated value of the cylindrical failure model is close to the measured value. The measured curve coincides well with the measured load-displacement curve, and the fitting effect is better.