Numerical Analysis of Flaw Sizes Detection in a Bored Pile Using Surface Reflection Method

摘要

The main purpose of this paper is to investigate the ability of thernsurface reflection method, namely the sonic echo method and impulsernresponse method, for flaw size assessment in a pile. Three dimensionalrnaxisymmetric finite element models were performed to investigate therneffects of the flaw size, flaw depth-to-pile diameter ratio, and pile-tosoilrnstiffness ratio on the response of the surface reflection test.rnAccording to the results from the numerical simulations, some usefulrnformulas for flaw size assessment in a pile are proposed, consideringrnthese factors simultaneously. Some other factors, such as the flawrnlength and pile diameter and length, were also discussed to show theirrneffects on the proposed formulas.