ANALYSIS ON REVIVAL MECHANISM OF AN ANCIENT LANDSLIDE AT SECTION K48+125～230 OF JINPING SPECIAL ROAD

An ancient accumulation landslide is located at the section K48+125～K48+230 of Jinping special road.During the rainy season in 2008(after the road is completed),a series of strong deformations occurred in the middle-lower of the landslide.According to analysis on revival deformation phenomena,geological and environmental conditions of the study area,it is derived that the revival deformation is mainly caused from cutting partly at the toe of the landslide.Heavy rainfall in 2008 has new slide-plane to be run-through and the middle-lower of the landslide to slide as a whole.The spoon-shaped slide-plane is a main internal factor controlling the development of deformation.The development process of new slide-surface is simulated by FLAC2D.After both the filling back and the sheet piled wall with anchor ropes are carried out,the sliding-mass stability factor will increase from 0.977 to 1.183 under rainfall conditions(design conditions)by Transmission Coefficient Method,which meet the safety requirements.It is shown by in-situ inspection that the landslide has no any new revival deformation phenomena to occur,which verifies the analysis on the genetic mechanism in this paper.