Based on strength reduction technique and geotechnical plastic limit analysis theory

an analyfical method about the location of anti-slide pile

anti-slide pile length and stability of slope reinforced by multiple piles is studied in terms of the functional balance principle

in which the pre-reinforcing effect of anti-slide pile is taken into account. Provided that a simple logarithmic spiral failure mechanism and a safety factor expression calculation of the pre-reinforcing slopes with anti-slide piles is derived. Provided that a simple logarithmic spiral failure mechanism

the expression to calculate the safety factor of slope pre- reinforced by anti-slide piles is derived. The iteration interior point method is used to calculates the objective function of safety factor incorporating the theory of minimized energy dissipation. The examples comparison illustrate the validity of this method and program.The local stability of slope reinforced by the single-pile is analyzed; and then the expression to evaluate the stability of slope reinforced by multiple piles is derived. The results show that the location of pile has significant influence on the safety factor

the location of critical slip surface and the pile length. And the best position for re-reinforcing slope with piles should be located in the lower slope region.