Discussion of 'Load Transfer Curve Analyses of Drilled Shafts Using Crosshole Sonic Logging Test' by Won-Taek Hong, Seung Yong Shin, Min-Chul Park, Jong-Sub Lee and Myung Jun Song

摘要

As a recent study (Fellenius 2017) reconfirmed, reliable prediction of drilled shaft (bored piles) performance has not yet become part of the geotechnical community's toolbox. This means that roughly one-half of the drilled shafts are overdesigned while the other half is not perfectly safe. Under such circumstances, engineers are compelled to take recourse to full-scale load testing. Such tests, when performed on instrumented piles and well documented, provide invaluable addition to the state of the art. Within this context, the authors have certainly made a useful contribution. Still, there are several items in this paper that call for clarification: