高速公路改建工程桩基自平衡试验及桩的受力特性研究

Study on Self-Balance Test of Pile Foundation and Force Characteristics of Piles in Highway Reconstruction Engineering

摘要: 相对于传统的堆载法或锚桩法，自平衡法具有省时、省力、安全、环保、占用场地少，适用范围广的特点。特别是对大直径、大吨位桩试桩，采用传统静载试验时试桩难度大，且不安全，得到的承载力数据也不够准确，造成承载力的浪费，在这种情况下，自平衡的优势也就更加的明显。本文以京港澳高速公路长沙段黎托段改造工程为基础，采用自平衡法测试大吨位桩的桩身轴力及侧摩阻力，既可确定实际承载力，又能测试桩的实测摩阻力与勘察所取侧摩阻力的差异，判断同一地质条件下桩基的承载性能。

Abstract: Compared with the traditional pile loading method or pile method, self-balancing method can save time and effort. It has the characteristics of safety, environmental protection, less occupied space, and a wide range of applications. Especially for large diameter and large tonnage piles, which is difficult and unsafe to test the pile with traditional static load test, the bearing capacity data ob-tained is not accurate enough, and the bearing capacity is wasted. In this case, the advantage of self-balancing method will be more obvious. Based on the reconstruction project of Changsha Liutuo section of the Beijing-Hong Kong-Macao expressway, self-balanced method is used to test the pile axial force and lateral friction force of the large tonnage pile, which can determine the actual bearing capacity and test the difference of the measured friction force and side friction resistance in survey , and judge the bearing capacity of pile under the same geological condition.