Reinforcement Mechanism of New Flexible Combined Piles (FCP) for Rocky Slopes Under Earthquake

The combined anti-slide piles can well prevent the sliding failure of the slope under earthquakes. In this study, based on a flexible combined anti-slide piles with synergistic seismic resistance, numerical models of bedding rocky slope containing soft and hard rock layers are established by Finite Difference Method. Then, the dynamic deformation characteristics of the bedding rocky slope are studied, and the reinforcement effects and mechanism of flexible combined anti-slide piles are compared and analyzed. The main findings are as follows: Flexible combined anti-slide piles have good reinforcement effect. Compared to no-piles support condition, the displacements of slope top and foot are reduced to 51% and 24%, and the maximum shear strain increment is significantly reduced to 51%. Meanwhile, flexible combined anti-slide piles can well reduce the displacement of the front and rear pile head, which are about 50% and 10% of single-row piles. In addition, the reinforcement mechanism of the new flexible combined anti-slide piles is mainly manifested that the pre-stressed flexible structures are interconnected to share the sliding force, which is a demonstration of good synergistic seismic resistance. These findings provide a reference for the supports of stratified rocky landslides in strong earthquake areas.