Abstract: Because of the slope effect, conventional methods are not applicable to calculate the deformation of laterally loaded piles in the slope. The failure test of laterally loaded pile in slope is carried out to determine the failure mode. The soil wedge is divided into oblique elements along the direction of the slope. Strain wedge model considering the effect of slope is proposed. Key parameters, strain wedge depth and soil strain of strain wedge, are obtained by iteratively solving equations of pile-soil interaction using finite bar element method. When the difference between the ground displacement of the pile and the ground displacement of strain wedge model is less than a permissible value, the ground displacement and internal force of pile obtained through the finite bar element method are the final answer. By comparing the test data and results of the proposed method, the rationality of the proposed method is verified. Finally, the ratio of the depth of damaged soil and the slope is defined as the scope of slope effect, and the influence factors are compared and analyzed. Results show that, the scope of slope effect is related to the strength parameters of soil and the size of pile, it decreases with the increase of pile diameter and soil strength.

Key words: piles in steep slope, strain wedge model, beams on elastic foundation, laterally loaded pile