Abstract: A landslide occurred at the slope of a factory area in Dalongli, Zijin Mountain in Fujian Province after experiencing several heavy rains. The original slope stabilizing measures were ineffective, resulting in cracks at the top of the slope, and the slope was in an unstable state. To analyze the instability mechanism of this slope, on-site undisturbed soil samples were collected and the triaxial as well as the direct shear tests were conducted to analyze the impact of rainfall on the mechanical parameters of the slope soil in the factory area. Based on the damage of the landslide, a typical section is selected, and the arbitrary slice method is used to analyze the factor of safety of the sliding surface by using the Geo-slide slope stability analysis software. The comprehensive mitigation measures such as slope cutting, ground anchor, anti-slide caisson, etc. are utilized for reinforcement. The stability check of the mitigation plan is also performed. The results show that the slope stability factor of safety increases from 0.943 to 1.359, which meets the design requirements. The slope is stable, and the expected mitigation goal can be achieved.

Key words: Slope Stability, Rainfall, Arbitrary Slice Method, Slope Treatment