青岛海湾大桥大直径深嵌岩桩承载特性试验分析

Experimental Analysis of Bearing Characteristics of Large-diameter Deep Rock-socketed Pile in Qingdao Gulf Bridge

对青岛海湾大桥4根大直径嵌岩桩,利用自平衡测试技术进行静载荷测试,分析了大直径深嵌岩桩(嵌岩比大于3)的承载特性———荷载位移曲线、侧摩阻力与位移的关系、以及侧阻力与端阻力的分担比等,并与三种规范对比,分析了不同规范的取值大小及存在问题。对比分析了自平衡测试与锚桩法测试结果,为该地区大直径深嵌岩桩基承载力的确定提供依据。

Four large-diameter rock-socketed piles in Qingdao Gulf Bridge were tested for their static load using self-balanced testing technology. Then the bearing characteristics - load displacement curve of large- diameter rock-socketed pile （with rock ratio more than 3 ）, the relationship between lateral resistance and displacement, and the sharing ratio between lateral resistance and end resistance are analyzed. Through comparing three standards, the value and existing problems of different standard are analyzed. The results obtained from self-balanced testing method and anchor pile method are compared to provide evidence for determination of the bearing capacity of large-diameter rock-socketed pile foundation in this area.