Study Of The Design Method Of Slope Reinforced With Anti-sliding Piles Considering Pile-Soil Interaction

The anti-sliding piles are widely used in the reinforcement engineering of slopes and mitigation and prevention of natural geological disasters induced by landslides. However, because of its rather sophistication, the working mechanism of anti-sliding piles and stability of piles in the slopes are not clarified. The design theory of anti-sliding piles need to further develop, the traditional theories avoid pile-soil interaction to some extent.The paper mainly focuses on critical pile spacing, slope stability and soil arch effect simulated by 3-D finite element method with ABAQUS softwarte. The main research work done in this thesis consists of the following parts.1. The critical spacing between anti-sliding piles is analyzed by combining the theory of Ito's plastic deformation with that of soil arch strength. Results computed from typital example shows the formula is reasonable and correct.2. The partial differential equation for governing deflection of anti-sliding piles based on theory of Ito's plastic deformation is used to solve the deflection, bending moment and shear force of anti-sliding piles. Moreover, the effect of various restrains conditions, parameters as pile and soils on the lateral forces of bearing piles are also discussed.3. The stability of slope stabilized by a row of piles is analyzed by Simplified Bishop Method based on the software of GEO-SLOPE. Especically, the lateral forces acting on the anti-sliding piles are achieved from the theory of Ito's plastic deformation. Furthermore, the rational reinforced position is also discussed through the comparison of safety factor for various conditions.4. The soil arching effect have been simulated using a large general 3D-FEM analysis software ABAQUS. The result indicates that the restrain condtion of pile head, deformation modulus and Poission ratio of rocks and soils have a remarkable effect on soil arching action. The distribution and magnitude of lateral force for various conditions are also analyzed. Numerical analysis shows the lateral force of anti-sliding piles is not only related with properties of rock and soil, but also related with retrain conditions of pile head, the strength of anchorage zone below the sliding surface.