基桩动力检测的问题及改进方向

有关桩质量及承载能力的动力检测方法很多,各有特色,很多文献有详细介绍,一些方法还列入有关规程或规范中。实际上,桩基是隐蔽工程,桩质量受施工技术的影响可能出现多样性的缺陷;桩承载能力的动力分析又必须依据规范规定的静载试验结果来校核、修正。因此,动力试验方法的准确性受多种因素的影响。本文依据实践工作中的体会和认识,明确指出现有的主要动力检测方法在判别桩可能存在的缺陷性质、位置、程度方面各自存在的局限性,以及在判断桩承载力的试测方式和分析方法上存在的问题,并就噪声干扰及桩动静试验可比性等问题提出一些改进的思路及设想。

Problem and improvement in pile dynamic testing

There are a lot of methods for pile dynamic testing in many literatures,and each method has special features.Some of them were already listed in some relevant guides or codes.Actually,pile foundation is a hidden project.The quality of piles is affected by making techniques. Various types of defect may be found.Meanwhile dynamic analysis of pile bearing capacity has to be modified according to the static load testing which is ruled by codes.For these reasons,the accuracy of dynamic method is affected by various factors.This paper points out the limitation of existing methods of pile dynamic testing in detecting defect type,location and extent,and the problem of existing methods of pile dynamic testing in deducing pile bearing capacity.At the same time,aiming at some problems,such as noise and comparability of pile dynamic-static testing,the author puts forward some improvement thoughts and directions.