基桩缺陷定量识别研究

Research on Quantitative Analysis Foundation Pile Defects

针对低应变动测技术不能定量识别基桩缺陷的问题,利用频率摄动理论对基桩进行定量识别.首先定义损伤识别参数,然后将基桩振动理论与矩阵摄动理论相结合推出基桩缺陷定量识别公式,用优化法或筛选法对公式进行求解,得出损伤识别参数,从而可以确定损伤位置和损伤程度.实验室制作5根混凝土模型桩,通过设置不同位置、不同程度的缺陷对该方法进行验证,实验结果表明,该方法既可以识别基桩的缺陷位置又可以识别基桩的缺陷程度.

Low strain reflected wave method can detect the defect location of a pile but can＇ t d verity in integrity testing. Relative to the defect position, defect severity is more important. The turbation theory is adopted to quantitatively detect the foundation pile defects in this paper. The fication parameters were defined at first. Then, the formulae and method of quantifying identi were presented by perturbation matrix and dynamics theories of foundation pile. rameter was determined by the optimization method. At last, the accuracy and verified seve etect defect se- frequency per- damage fication The damage identifi feasibility of this metho identi- defects pa- d were by model pile experiments, and the experiment results show that the method could accurately detect rity of pile defects.