Abstract:
An analysis method is presented for slope stabilization involving the use of micropiles extending through a sliding mass into more stable material. This type of wall typically consists of a line of micropiles placed into the soil mass at alternating batter angles. The micropiles are fixed at the ground surface by means of a concrete cap beam running the length of the wall, effectively creating a structural A-frame to resist landslide forces. The proposed analytical model involves using a computer program that accounts for the group behavior of a single-row group of micropiles framing into the cap beam. The calculated axial, shear, and moment resistances mobilized in the micropiles can then be input back into a limit equilibrium slope stability analysis to establish the increased factor of safety provided by the A-Frame micropile wall.