<p>Over the past few decades, it has become a global imperative to safeguard against reservoir-induced landslides. Yet current studies have primarily focused on a single-slip-surface failure mode, leading to limited research on landslides with multiple slip surfaces. Consequently, traditional stabilizing pile designs struggle to accurately evaluate the stability of multiple-slip-surface landslides. This study proposes a calculation method based on the residual thrust method, considering the interaction between slip surfaces and the transmission of forces in stabilizing piles, to evaluate the stability of multiple-slip-surface reservoir landslides with stabilizing piles. Taking the Shijiapo landslide as an example, this study examines the variation in landslide stability under different reservoir water level conditions and explores the influence of various depths of stabilizing piles on landslide stability. The results indicate that the calculation method effectively reproduces the reduction in the stability of the Shijiapo landslide as the reservoir water level decreases and reveals the phenomenon of a shallow slip mass driving deep slip mass sliding after applying stabilizing piles. Furthermore, when the reservoir water level drops to an elevation of 145&#xa0;m, failure occurs along a deep slip surface, which is in accordance with the actual failure evolution process. This method offers valuable recommendations for landslide protection and management.</p>