Revival Deformation Mechanism of Hefeng Landslide in the Three Gorges Reservoir based on FLAC Software

摘要

Based on groundwater flow equation and static equilibrium equations, coupling model of seepage and stress field of Hefeng landslide was built by FLAC3D software, and then revival deformation mechanism was analyzed. Results show that, landslide displacement constraint at the toe of landslide occurred for osmotic pressure while the reservoir water rises to 173 meters, and reservoir water don't lower the stability of accumulative landslide. But displacement constraint at the toe of landslide gradually reduced while reservoir water drops from 173 meters to 169 meters, and deformation at front border is bigger than rear border, and displacement vectors toward outside slope, so reservoir water dropdown would lower the stability of such accumulation landslide, and then the left part of landslide revived.