This paper presents the analytical methods of slope-stabilizing piles using the three-dimensional (3-D) Finite Element (FE) analysis with the Strength Reduction Method (SRM). This 3-D finite element model is employed to overcome the limitations observed in 2-D FE analysis. The method adopted in this paper can avoid the assumption of soil movement and the pressure distribution along the piles subjected soil movement. The spacing effect of the pile is considered in the 3-D model, the S/D (S: center to center, D: diameter of pile) ratio, equal to 4.0, is found to be equivalent to the single pile stabilization. The middle portion of the slope is identified as the optimal location to place the piles. The proper length of the pile, which can be used to stabilize the slope, is also examined using 3-D FE analyses. It is concluded that L/H greater or equal 0.70 is recommended (L: pile length, H: slope height). The failure mechanisms of the pile-slope system subjected to the pile locations, pile head conditions and pile length are each discussed. The contact pressure, shear force and moment along the piles are presented to illustrate the pile stabilizing mechanism herein.
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