Geo-reinforcement foundation (GRF) is a new type of reinforcement pile foundation of which the bearing mechanism is not clear at the present time. By building the 3D nonlinear model of geo-reinforcement foundation

considering the contact effects between pile and soil and that between anchors and soil

utilizing geotechnical professional calculating software FLAC3D

the pile and soil displacement of geo-reinforcement foundation is analyzed; and the soil yield characteristics

variation regularity of pile shaft force

side resistance and end resistance are also studied. The numerical calculation results show that geo-reinforcement foundation can arouse the soil around pile to bear load more efficiently; and the side resistance

end resistance

ultimate bearing capacity of geo-reinforcement are larger than that of straight pile with equal diameter; because of the anchor function

the pile shaft force is suddenly decreased

like a “step”

near the anchors; the function of anchors is closely related with the displacement of pile top. Anchors function the bearing capacity only on the condition that the pile top displacement reached a curtain number. Relaxation region appears in the soil up the anchors and compaction zone occurs in the soil down the anchors; anchors move downward together with pile body and they interact with each other

which causes tensile stress in the lower part of the anchors and pile body near the anchors. The study has laid some basis for the extension and application of geo-reinforcement foundation in projects

which is valuable

to some extent

during the process of designing the geo-reinforcement foundation.