Analysis of bearing mechanism of single pile in sand under vertical load based on PFC-FLAC coupling method
The rapid development of offshore wind power industry has led to thewidespreaduseof single pile foundations due to their applicability and cost-effectiveness.Asthe design diameter and length of pile increase,the behavior of the pile-soil interaction model different from that of short pile,resulting in notable changes in the force transfer process.This paper aims to investigate the load-bearing mechanism of single pile under vertical load,soil parameters were calibrated based on indoor triaxial tests with dense Fujian standard sand as the material.Furthermore,a model was established using the continuous-discontinuous coupling method and PFC-FLAC software to simulate the vertical static loading process of pile foundation,and the interaction mechanism between pile and soil was studied from the perspective of macro and micro combination.The findings reveal that the axial force along the pile gradually engages with the increase of load and the pile tip scarcely bears any load at the initial loading stage.Throughout the loading process,the surrounding soilundergoes gradual densification because of the interaction with the pile.Significant changes in porosity and stress concentration,particularly in the regions 15D～30D where the load is primarily borne,indicate distinctive characteristics of friction piles.
pilevertical loadcontinuous-discontinuousdense sandcoupling analysisdiscrete element method
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