Abstract：To study the mechanism of deeply buried piles stabilizing the slope，a series of large-scale model tests are carried out. Several testing tools including rigid load cells are employed to measure the anti-sliding forces initiated by the piles and the sliding force exerted by the piles，especially the earth pressure cells are used to measure the variation of stress condition at the rear of the back of piles and upward to the top of piles as the sliding force impelled by the system of force output. On the basis of the variation process of measured data，the time and the location of slide surface in the slope are identified；and the maximal anti-sliding forces upward to the top of piles are calculated. Then，the failure modes and transformation were analyzed as the anti-sliding length of the piles changed. Physical conditions of the pile cross-section are determined；and the sliding force subjected to the piles was estimated. The mechanism of deeply buried piles for the slope reinforcement and the relationship between the sliding forces subjected to the piles and that supplied by the slope upward to the top of piles are analyzed to supply scientific basis for the design method of the deeply buried piles.
