反褶积对桩基础低应变检测适用范围的验证

Application of uniform design method for determining the applicable scope of deconvolution in low strain integrity testing of pile foundation

地震勘探中的反褶积积分广泛地应用于地层系数的反演,但在桩基础完整性检测方面的应用还是空白。根据这两方面应用的相似性,尝试将反褶积应用于桩基检测中。由于每种方法都有一定的适用范围,因此以桩径和桩长为变量,各取10组常用值进行组合,通过均匀设计法选出最有代表性的10组组合值,使结果具有普遍意义且避免了繁重的计算过程。通过有限元软件ANSYS/LS-DYNA建模以及对所得时程曲线结果的分析,证明了反褶积在桩基检测中的适用性,为该方法的进一步研究和实际工程应用提供了理论依据。

Deconvolution is one of the methods of seismic exploration engineering,which is used in the reflectivity sequences extraction widely,but not used in the detecting of pile foundation integrity up to now.In this thesis,we try to use the method of deconvolution to detect the integrity of piles,which is based on the similarity of each other.Every method has its applicable scope,so we use the uniform design method to choose ten groups of common examples to show the range of length and radius of pile individually.We use the ANSYS/ LS-DYNA software to establish different models,and then extract the velocity-time curves through low strain integrity testing of the pile.According to the analysis of curves with deconvolution method,the position of pile bottom is shown.Based on the result,we give the applicable scope of deconvolution,which provides a basis for further research on the method and project application.