The variation law of pile-side friction and pile-end friction in horizontal seismic vibration process of piles foundation in liquefiable sandy soil was studied. Firstly, through shaking table tests, the feasibility of MIDAS-GTS finite element software was verified. Through FE analysis, the settlement time histories of the piles foundation under 3D, 3.5D and 4D working conditions and its load-settlement (Q-S) curves during different vibration time durations were obtained. Based on relevant literatures, the curves were analyzed and the pile-side friction and pile-end friction were calculated. When the piles foundation was in a liquefiable soil layer, the modified formula for the vertical force-bearing capacity of the piles foundation under dynamic load was proposed to provide a reference for the relevant design.
Key words
liquefiable soil /
piles foundation /
pile-skin friction /
pile-end friction /
reduction factor
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