作　　者： ;

机构地区： 华南理工大学土木与交通学院

出　　处： 《地下空间与工程学报》 2019年第S01期243-248,共6页

摘　　要： 对于桩顶有上部结构的既有桩基,基于应力波传播速度的旁孔透射法一般难以准确判别出桩身中长度较小的缺陷。本文提出基于应力波首至波波幅的旁孔透射法,进行了不同入土深度和不同长度及位置缺陷桩基的旁孔透射波法检测模拟分析,对比了两种旁孔透射法的分析结果。由分析结果发现,应力波的首至波波幅在桩基缺陷段的两端及桩基底部会发生明显的突变,从而可以判断出缺陷段的大小及位置和桩基的入土深度。基于应力波首至波波幅的旁孔透射法可以识别桩身中长度较小的缺陷,在既有桩基缺陷和入土深度的检测中将两种方法结合起来使用,可以提高检测准确性。 For existing piles with superstructures,the traditional parallel seismic method is based on the propagation velocity of the stress wave,and it is difficult to identify more short defects of piles.The parallel seismic method based on the first wave amplitude of the stress wave is proposed in this paper,and the detection process for piles with different buried depths and different length and location defects is simulated.Analysis results of two detection methods are compared.From these results,it is found that the first wave amplitude suddenly changes on two ends of the defect or the pile bottom,so the location and the length of the defect or the buried depth of the pile could be determined And the parallel seismic method based on the first wave amplitude has useful to identify more short defects of piles.Two detection methods could be combined to use in the practical detection of existing piles in order to improve the accuracy.

关 键 词： 旁孔透射波法 既有桩基 入土深度 桩基缺陷

领　　域： []