Centrifuge modeling of multi-row stabilizing piles reinforced reservoir landslide with different row spacings

The multi-row stabilizing piles have been applied in the stabilization of large-scale reservoir landslides in recent years. However, the mechanical behavior and deformation characteristics of the multi-row stabilizing piles reinforced reservoir landslides have rarely been investigated. This study takes the Taping landslide, a large-scale reservoir landslide in China, as a prototype. Two centrifuge tests were conducted to study the deformation and failure characteristics of the multi-row stabilizing piles reinforced reservoir landslide with two different row spacings. The result shows that the reservoir water level (RWL) drawdown operation induced the soil movement and high downslope driving force, further causing a significant increase in bending moments at the lower section of the piles, with peaking near the sliding zone; eventually, bending deformation and failure occurred more easily near the sliding zone. The downslope part of the piles can change the mechanical transmission behavior of the multi-row stabilizing piles in reservoir landslides. Small row spacing can enhance the mechanical connection between the rows of piles and raise the overall reinforcement capacity of the piles. The large row spacing weakens the mechanical connection between the rows of piles, and the mechanical states of the pile in different rows are relatively independent. As a result, the piles are easily damaged one by one from the first row to the last row, and the overall reinforcement capacity of the multi-row stabilizing piles is poor.

Automated summary

This study investigates the deformation and failure characteristics of multi-row stabilizing piles reinforced reservoir landslides through two centrifuge tests. The results show that the lowering of the reservoir water level induces increased bending moments at the lower section of the piles, leading to bending deformation and failure near the sliding zone. A smaller row spacing enhances the mechanical connection between the piles and improves the overall reinforcement capacity, while a larger row spacing weakens the connection and results in independent mechanical states for each row of piles.