Luohangtan landslide is one of the important landslides in Gushan hydropower station of Hanjiang

it is an accumulational landslide of collapsing soil

the volume is about 70 × 104 m3

it is a medium-sized landslide. According to a field survey

preliminary analysis shows landslides are stable for current state overall. For status quo，heavy rain and reservoir impoundment

the landslide stability is calculated

the results show that：in status quo conditions

the landslide is stable; under heavy rain and reservoir impoundment conditions

landslides on both sides are in poor stability

the landslide stability of middle part is better

however

the instability of landslides on both sides is bad for the stability of middle part. Landslide failure is more harmful to the project; using lardslide treatment combining with filling materials for cofferdam as removal measure is proposed