桩身质量检测的一种新方法——桩形估计法

A New Method for the Pile Quality Detection——Estimation of the Shape of Piles

本文提出了桩身质量检测的一种新方法——桩形估计法,或称“ESP”(Estimation of theShape of a Pile)法。该法基于一维杆应力波理论,将桩划分为N 个单元,根据波在各单元界面处反射与透射的传波原理,推导出在桩顶进行瞬态激振时桩顶的速度响应与界面反射系数以及桩的形状之间的关系。对几种典型缺陷桩进行了计算机模拟,其结果证明作者所提出的桩形估计法是可行的和有效的。现场试验更进一步证明:该法能够较准确地估计出缺陷桩或好桩的形状。

In this paper,a new method for the pile quality detection is developed,which is the estimation of theshape of a pile(ESP method),Based oh the stress wave propagation theory of one dimentional rod,dividinga pile into N elements,from the principle of the wave reflection and transmit at the junction between theneighbouring elements,the authors have derived a relation between impulse velocity response of the pile,boundary reflection coefficients and its shape as the head of the pile is excited.The computer simulationsare carried out for some typical defect piles.The results obtained show that the method proposed by the au-thors is feasible.The experiments of piles prove that the size,type and site of a defect in a pile can be accu-rately determined,and more than one defects in a pile can be identified using ESP method.