桩基承载力自平衡测试技术及应用研究

Application of Self-balanced Method in Bearing Capacity Testing of Pile

结合工程实例,介绍了桩承载力自平衡试验的原理和方法.探讨了大直径、超长钻孔灌注桩的竖向承载性状,分析了桩端压浆对于提高桩基承载力的作用,研究了桩侧阻力和桩端阻力的发展规律及注浆前后的变化.测试结果表明:桩端压浆对提高桩基承载力,改善桩基沉降效果显著;桩端承载力提高3264kN,桩侧摩阻力提高较多,为6290kN;同时也表明自平衡技术可广泛应用于桩基承载力测试.

In this paper,the self-balance test principle and method are introduced in combination with a case-study.The vertical bearing behavior of large diameter and super-longhole bored pile are analyzed,and the effect of grouting on improving the bearing capacities of piles is discussed.The development of the pile side resistance and pile tip resistance at the pre and post of grouting are investigated.The results show that the grouting can improve the bearing capacities of piles and decrease the settlement obviously,3 264 kN for the tip resistance and 6 290 kN of the pile side resistance are achieved.The application suggests that the proposed test method has numerous advantages in the testing of large capacity pile in the sea,and the method is expected to be extended in its applications.