声波透射法桩基检测缺陷范围确定方法研究

Study on the method for determining defect ranges of bored piles by using cross hole sonic logging

本文对目前声波透射法桩身完整性判定的判据进行分析,讨论其各自的优势与局限性;结合现场钻孔灌注桩桩身常见弊病,提出可能造成的漏判误判情形;结合工程实例,依据桩身完整性检测的综合判定的方法,对桩身缺陷在横截面上的分布范围进行了分析。在采用综合判定的方法获取较为全面的测试参数基础上,以声速和首波波幅作为首要判据,结合细测、几何投影的方式能够对桩身有无缺陷、缺陷范围大小做到较为准确的判断。

The criterions for the integrity evaluation of bored pile integrity by using cross hole sonic logging are analyzed, and the advantages and disadvantages of the criterions are discussed. Referring to the common problems of bored piles, some situations of the miscarriage of justice are put forward. Based on the comprehensive judgment method and combined with engineering examples, the distribution ranges of bored pile defects at cross section are analyzed. After obtaining the comprehensive test parameters by using the integrated judgment method, the sound velocity and the initial amplitude are taken as the primary criterion of the integrity of the bored piles. Then, the method with fine measurement and geometric projection is combined with to deduce the exact range of defects.