The Outang landslide

a typical large consequent bedding rockslide in Three Gorges Reservoir

is situated on the south bank of the Yangtze River at Anping Town in Fengjie County.The volume of Outang landslide is about 6.4×107 m3.In 2003

the 180

2

20mplatform at the front of the landslide was chosen as a new site of Anping Town

and protection engineering was implemented for shallow slide mass.But since October 2008

the deformations gradually emerged at pace with the first time of water storage in Three Gorges Reservoir.In 2013

the complete relocation of Anping Town was restarted by Fengjie County government.After investigating the physical characteristics

comp

osition and monitoring data of Outang landslide

the Discontinuous deformation analysis（DDA）method is used to simulate the deformations of the landslide in natural state and rainfall state

the failure mode is studied by analysing the velocity of blocks in representative positions.Results show that the whole landslide remain basically stable in two states.If the mechanical parameters of the frontal part further decreased

the possibility of landslide along the top of bed rock is little for the rock-layer is reversed at the front

while there is possibility that the landslide will occur along a new inner potential slip surface.