摘要
大直径灌注桩通常桩径较大、桩长较长,在应用低应变反射波法检测其完整性时,桩顶部或浅部往往会有较明显的三维干扰,并易出现桩底反射波不明显、曲线复杂、难于判断等问题,从而对实测桩顶速度曲线的准确判断造成影响,甚至引起误判;同时,由于实测曲线反演解释的多解性,对桩身完整性的判断需要综合考量各种因素的影响。针对以上问题,根据大量的工程实践经验,提出了三维效应的简单识别方法,并得到了相关理论研究成果的印证,并结合典型工程实例,说明了对实测曲线进行综合分析判断的重要性。
Large diameter cast-in-place pile is usually bulky and longer, when testing the integrity by low strain reflection wave method, there is always obvious disturbance on the top or superficial part, and the unconspicuous bottom reflection wave, complicated curves also make the judgment difficult, even lead to a wrong judgment; at the same time, because of the multi solution of the measured curve inversion interpretation, to estimate the integrity of the pile body should consider all kinds of effects . Based on above problems and many project practices, simple method of 3D effect recognition is proposed, which is also verified by relevance theoretical research result. According to project practice, the importance of comprehensive analysis and judgement of measured curves is declined.
出处
《工程质量》
2009年第9期25-27,共3页
Construction Quality
关键词
大直径灌注桩
低应变反射波法
三维效应
large diameter cast-in-place pile
low strain reflection wave method
3D effect
