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本文通过对某产生浮桩的工程采用了有效、可控的自由落锤复打法加固,并在加固过程中结合高应变动力手段监控,对采集的信号采用实测曲线拟合法进行分析计算后得出以下结论:在自由落锤复打加固浮桩后,桩端土刚度有了显著提高,随着桩端土刚度的提高,桩端附近的桩侧阻力也有了明显的提高。并分析阐述了桩端土性状对桩侧阻力的影响机理,在高应变自由落锤复打法中,桩端土受挤密作用与径向应力共同增强作用下,形成类球形的“桩土共同体”的直径要大于桩身直径,因此其所贡献的摩阻力大于加固初期的摩阻力。
In this paper, an effective and controlled free-fall hammer strike method is used to reinforce a floating pile project, and the monitoring is performed during the reinforcement process combined with high-strain dynamic means. The collected signals are analyzed and calculated by using the measured curve fitting method The following conclusions are drawn: After the free-fall hammering and reinforcement of floating piles, the soil stiffness of the pile tip has been significantly improved. With the increase of the stiffness of the pile tip, the pile-side resistance near the pile tip has also been significantly improved. The influence mechanism of pile tip soil on the pile-side resistance is analyzed and explained. Under the high-strain free-fall hammer strike method, Soil community "diameter is larger than the diameter of the pile, so its contribution to the friction is greater than the initial resistance of the friction.