Abstract: To study the mechanical deformation characteristics of pile foundations in slope filled areas, a numerical simulation method was used to study the effects of fill interface slope on negative frictional resistance, neutral point depth, fill surface settlement, and horizontal displacement of piles. The results show that as the slope of the fill interface increases, the negative frictional resistance decreases, the neutral point depth remains basically unchanged, and the surface settlement of the fill before the pile decreases, while the surface settlement of the fill after the pile increases; Therefore, when designing pile foundations, it is necessary to consider the impact of the slope of the fill interface on the axial force and horizontal deformation of the pile foundation. A composite loaded pile with side roots has been developed. The inverted conical plastic film can effectively reduce or even eliminate the impact of negative frictional resistance. The installation of side roots can reduce the settlement of underconsolidated soil, while also improving the ability of the pile foundation to resist horizontal deformation. The research results can provide theoretical support and technical reference for similar engineering design and construction.

Key words: Civil &, Construction Engineering, Slope Fill, Negative Friction, Horizontal Deformation, Axial Capacity