Abstract:

Due to its unique geographical and climatic conditions，Fujian Province often encounters

typhoons and rainstorms，resulting in frequent landslide disasters. Based on the strength reduction theory，

FLAC3D software is used to analyze the stability of a building slope affected by Typhoon Haikui in September

2023 in Longyan City，Fujian Province. The results show that the safety factor of slope is 1.676 under the

condition of self-weight，which is stable. After the typhoon rainstorm，the safety factor dropped to 1.230，

below the norm value，indicating the risk of instability and damage. Landslide risk increases significantly

during typhoon season. The plastic through failure area of slope section is about 5.0 m2 ，and the error is

11.1% of compared with the actual landslide area，which provides an important reference for slope stability

assessment under extreme weather conditions.

Key words:

slope, stability analysis, strength reduction method, typhoon and rainstorm