![]() A limit decrease of the dragload induced by NSF was observed when the working load increased. ![]() The working load and the pile diameter affected the dragload and the position of the neutral plane less. It was found that higher backfills and higher consolidation degree were dominant in the formation of NSF, causing an increase of the dragload and an upward movement of the neutral plane. ![]() The height of backfills, the consolidation degree of soil, working loads on the PHC pile, and the pile diameter were analyzed in sensitivity analyses to investigate the influence on NSF. The formation of NSF on a pre-stressed high-strength concrete (PHC) pile under a control building in a Vietnamese project was investigated using a verified numerical model in FLAC3D. It is recognized that NSF on a pile affects the structural and geotechnical design. 2HydroChina Itasca R&D Center, Hangzhou, China.1PowerChina Huadong Engineering Corporation Limited, Hangzhou, China.Xiong Gen 1, He Ben 1, Pan Bing 1,2*, Ge Xiangming 1,2 and Chu Weijiang 1,2
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