Limit equilibrium analysis on stability of slope reinforced by anti-slide piles with the nonlinear strength criterion

Considering that the reinforcement mechanism for the slope reinforced by the anti-slide piles with the nonlinear strength criterion has not yet been revealed by the existing limit equilibrium methods, the earth theory was applied to simplify the mechanical model of the anti-side pile in the slope sliding body, and the effective pressure on the side of anti-slide pile was deduced according to its mechanical equilibrium condition. Then, based on the formula of stress on the slip surface obtained by the Swedish method, the limit equilibrium solution of slope stability with nonlinear strength criterion was established according to the definition of slope safety factor. Finally, the effectiveness of the proposed solution was validated by engineering practice. The results show that the nonlinear parameter of geotechnical body has significant influence on slope stability, and it is necessary to increase the length of anti-slide pile for achieving the design goal of the slope in stable state when the strength nonlinear of geotechnical body is considered. It is beneficial for the anti-slides piles arranged near the slope toe to improve the slope stability, but the slope local failure above the anti-slide piles should be prevented. The results from engineering case show that the proposed solution is effective for guiding the reinforcement design on the slope reinforced by the anti-slide piles. © 2020, Central South University Press. All right reserved.