Granite spreads widely around our country

which has commonly better engineering geology quality

but its physical mechanics property will become poor dramatically and a kind of disposal-difficult rock mass after suffering from corrosion

denudation and weathering

etc.Some weathered granite slopes are very common in the road-building process.Owing to special lithology characteristics

such slopes will easily lose stability to be destroyed in some conditions

which brings serious damage to both construction and use of road.Therefore

study on slope deformation mechanism and stability-losing pattern is very important not only for slope excavation but also for slope support.By investigating the engineering geological conditions of one weathered granite slope along a certain expressway

the paper analysed the rock mass structure characteristics

deformation-failure mechanism and stability-losing pattern

and evaluated the stability value of complete slope.As a result

the corresponding excavation and treatment measures of the slope were suggested.Espeically

the study conclusion will provide theoretical reference and guidance for design and construction of the same kind of slope.