大直径超长PHC桩缺陷类型分析

结合国外某大型工程中应用PDA进行超长大直径PHC桩的高应变检测工程实例,根据高应变初打和复打检测桩身完整性的结果对比,对出现在桩身、桩顶、接桩位置以及桩身下部的缺陷进行分析。对于超长大直径PHC桩的桩身完整性判断提出一些建议和看法:不能完全以桩身完整性系数作为唯一判断标准。

Analysis of defect types of large diameter super-long PHC pile

With the application of high strain dynamic pile test on large diameter super-long PHC piles of major project abroad,the pile defect types are concluded by comparing the PDA test results of the end of drive and restrike.The defects are found out at the pile head,pile body,the joint position and the bottom of pile etc.New proposals about the large diameter super-long PHC pile integrity judgment are put forward that the integrity coefficient of pile is not the only criterion.