Model Tests on Vertical Bearing Behavior of Single Pile Under Combined Loads in Sandy Ground

Abstract:

Based on five groups of tenpile indoor model test, considering the influence of lateral load size and its loading position, the vertical bearing capacity of the single pile under combined loads in sandy ground are studied. The results of model test show that without regard to vertical load, horizontal ultimate bearing capacity decreases of the single pile with the height of the point of application by lateral load apart from the ground increases, while its magnitude is reduced gradually. The settlement of pile top increases and vertical bearing capacity decreases with the increases of the preapplied lateral or moment loads of the single pile, and its effect on the magnitude is dependent on the lateral load. The vertical load produced a PΔ effect when it was applied after the lateral and moment loads, which causes the horizontal displacement increases and the ultimate horizontal bear capacity of the single pile decreases. The experiment data indicate that the horizontal displacement at the top of pile is positively associated with settling volume of single pile, tip resistance of pile.

Key words:sandy ground; lateral load; moment load; model test; vertical bearing behavior