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采用不同检测方法,通过某桥梁嵌岩灌注桩的检测实例,对基桩完整性及嵌岩性状进行了多种检测方法的对比分析,结合施工情况及地质资料分析了事故原因。研究结果表明,在嵌岩性状无法确定或有所怀疑时,可采用钻芯法或更为直接的静载试验进行验证;在基桩完整性检测上,可采用低应变法进行普查,再根据低应变法检测结果,结合声波透射法(基桩有预埋声波管时),选用钻芯法、静载试验对有缺陷的桩进行抽测,以综合判断缺陷的性质及区域大小。
By means of different testing methods, through a test example of a rockfill bored pile in a bridge, a comparative analysis on the integrity of the pile and the embedded rock properties was carried out, and the causes of the accident were analyzed according to the construction conditions and geological data. The results show that when the inlaid rock properties can not be determined or are in doubt, it can be verified by the core drilling method or the more direct static load test. In the detection of pile integrity, the low strain method can be used for census. According to Low strain method test results, combined with acoustic transmission method (when the pile has a buried acoustic tube), the choice of core method, static load test of the defective pile pumping test to comprehensively determine the nature of defects and the size of the region.