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阐述基于大直径钻孔灌注桩桩端位移观测和通过计算曲率极值的方法研究单桩极限侧阻力方法的优点。介绍观测桩端位移的方法,根据大直径钻孔灌注桩单桩竖向抗压静载试验中对桩顶荷载和桩端位移的观测数据特点,分别建立基于双曲线函数和指数函数的曲率极值模型,并通过针对现场实测数据的曲线拟合取得模型参数,求得桩极限侧阻力,并对上述两个模型进行对比.以清河试桩工程实例进行验证,结果表明,该方法对于研究端承摩擦桩的单桩极限侧阻力具有避免过多主客观因素干扰、便于程序实现、计算过程清晰、结果明确的特点.
The advantages and disadvantages of the method of single-pile limit-side resistance are described based on the observation of pile-end displacement of large diameter bored pile and the method of calculating the curvature extreme value. In this paper, the method of observing the displacement of pile tip is introduced. According to the observation data of pile top load and pile tip displacement in the test of vertical compressive static load of large diameter cast-in-place pile, the curvilinear poles based on hyperbola function and exponential function And obtain the model parameters through the curve fitting of the measured data in the field to get the ultimate resistance of the pile and compare the two models.According to the example of Qinghe pile test, the results show that this method is effective for the research side The ultimate resistance of the single pile bearing friction pile has the characteristics of avoiding the interference of too many subjective and objective factors, facilitating the realization of the program, the calculation process is clear and the result is clear.