The mechanical behavior of bridge pile foundation were complicated because overlaying mantle rock always has lateral thrust on piles foundation and free face of slope would have an influence on distribution of lateral resistance. The factors mentioned above could make it significantly different for piles foundational mechanical characteristics in slope from flat ground. Based on model tests on piles foundation in slope, the distribution of thrust, lateral resistance and its influence scope were discussed. According to the study of piles foundation stress in different loads combination and pier-column length, the mechanical characteristics of bridge foundation in slope were analyzed. The tests results show slope thrust distribution shape was simplified as a parabola. Approaching to certain depth of pile foundation, thrust would decrease with depth. Due to the existence of free face of slope, the lateral resistance was small and lateral resistance could be fully exerted when soil layer thickness is five or six times that of pile diameter. With an increase of the pier-column length, the moment of piles foundation has greatly increased and P-Δ effect of piles foundation in slope was more significant than in flat ground.
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