瞬态机械阻抗法在工程基桩缺陷诊断中的应用研究  

Application of Transient Mechanical Impedance Method in Construction Pile Foundation Defect Diagnosis

作　　者：哈图 刘俊霞 常智慧 Ha Tu;LIU Jun-xia;CHANG Zhi-hui

机构地区：[1]内蒙古自治区交通建设工程质量监督局,内蒙古呼和浩特010051 [2]内蒙古自治区道路结构与材料重点实验室

出　　处：《内蒙古公路与运输》2019年第1期11-17,共7页Highways & Transportation in Inner Mongolia

基　　金：国家自然科学基金项目(51308266)

摘　　要：以1根完整无缺陷基桩和3根预先设置缺陷的基桩为研究对象,采用奥地利德威DEWESoft振动测试系统,基于瞬态机械阻抗法,对比完整基桩,对3根有缺陷基桩进行了诊断分析,探讨了基桩固有频率测试的可行性及刚度测量的可重复性。结果表明:基于固有频率的机械阻抗法多次重复测试结果一致性较好,测试结果可以反映缺陷位置、缺陷处的有效桩径,基桩缺陷程度与其刚度值具有一定的正相关关系。因此,推荐采用同一工地、地质情况基本相同的基桩刚度测试统计值,运用数理统计等方法确定一个合理的刚度值界限作为基桩缺陷程度的划分依据,以达到定量评估基桩质量的目的。In this paper,one non-fault pile and three pre-placed piles with faults are taken as the object of study. The test is carried out using the Austrian DEWESoft vibration test system. In contrast to the intact foundation pile, three defective piles based on the transient mechanical impedance method are diagnosed and analyzed. The feasibility of testing the natural frequencies of piles and the repeatability of stiffness measurements are discussed. The results show that the mechanical impedance method based on natural frequency has good consistency in repeated test results. The test results can reflect the defect location and the effective diameter of the defect. The defect degree of the foundation pile has a positive correlation with its stiffness value. It is recommended to use the same statistic value of pile stiffness test in the same site and geological conditions,and to determine a reasonable limit of stiffness value by mathematical statistics as the basis for the classification of defect degree of pile,so as to achieve the purpose of quantitative evaluation of pile quality.

关 键 词：机械阻抗法 基桩 故障诊断 刚度 固有频率 

分 类 号：TU473[建筑科学—结构工程]