The Badong Yangtse Bridge is a large highway bridge across the Yangtse River

connecting the No.209 national highway to the new town of Badong County. The bridge is a kind of simply supported cable stayed bridge of 900.5 m length

of which the 388 m main span has two towers of 218 m high. The bridge’s weight is huge and the safety requirement is high

The bridge lies in the middle part of the Three Gorges where the geological condition is the most complex area. There are cliffy landform

sharply incised valley

complicated geo-structure

heavily cracked rock mass

frequent landslide and common debris flows. The slope stability has directly effect on the safety of bridge. On the basis of investigating the bridge site’s geotechnical condition

the stability of slope was simulated by nonlinear elastoplastic finite element method and block limit equilibrium principle. At the same time

the developing trend of the slope’s stability was predicted while the reservoir storing and the bridge building up. The researches show that the bridge’s weight

fluctuating water lever and earthquake are induced factors of slope’s failure. The stability of the slope is sharply decreased after the reservoir storing and the bridge building up. The slope may slide along the interface between T2b3 and T2b2. Some control measures must be taken. In this paper the effect of slope failure on the bridge was analyzed. Finally

some suggestions about existed problems are proposed.