Predicting sinking resistance of jacked piles with CPT in a multilayer soil at the pearl river delta alluvial plain

摘要

Comparative tests between a new type of cone penetration, which an auxiliary total force sensor has installed, and model piles in same site are done in the Pearl River delta region typical strata. The relationships of the shaft resistance and total resistance between the model piles and the new type of CPT are analyzed, and the characteristics and working mechanism of the shaft and tip resistance of pile in the pile penetration process are investigated. Through analyzing the phenomenon of penetration of the model pile and the CPT, a novel empirical method is proposed, and a new simple empirical formulation that can be used to estimate the total resistance of jacked pile is presented at last. The influence of sliding friction and the share of tip resistance should be considered when the shaft resistance of pile is calculated. The continuous injection mobilization coefficient η, the share ratio n, and its correction coefficient ξ of the total shaft resistance are introduced to calculate the total resistance.