Abstract: A landslide in Pingnan County has experienced significant instability due to excavations from residential construction and rainfall, posing a severe threat to the safety of nearby residents’ lives and property. To address this hazard, this study integrates field investigation results to systematically analyze the geological conditions and deformation-controlling factors of the landslide. The stability of the landslide under natural and storm conditions was quantitatively evaluated using the strength-reduction method. Based on the stability analysis results, referring to similar engineering cases, a comprehensive remediation plan, “retaining panels + active protection nets + drainage interception + slope vegetation,” was proposed. The stability of the landslide after remediation was further analyzed. The results indicate that the stability coefficients of the landslide under the two conditions were 0.833 and 0.965, respectively, both indicating an unstable state. After reinforcement, the stability coefficients increased to 1.240 (natural condition) and 1.186 (storm condition), satisfying the relevant specifications. The research findings provide a theoretical basis and engineering references for the prevention and control of similar landslide hazards.

Key words: Landslide, Stability Analysis, Landslide Remediation, Strength-Reduction Method