A bridge on 316 national road was put into use in 1990 and was found serious geological diseases in 1999. Now it has been put into use again after being repaired and reinforced.Taking the north bank of the bridge(Fuzhou bench) as an example,the paper analyses the genesis of the disaster based on the geologic conditions such as types and structures of stratigraphy etc.,calculates the stability of the bridge foundation and the slope,also analyses the monitoring information of displacement in deep part of the ...