Firstly

the calculation formula of the safety factor on sliding stability in condition of extreme snow disaster is derived.Secondly

through the calculation and analysis

the variation law of the safety factor on sliding stability with the changes of water depth in cracks

slope height

slope angle

inclination of structural surface of rock slope is revealed

so is the relationship between the factor and frost depth.Then diagrams which express the relationship between the coefficients of sliding stability and geometric factors are drawn when the rock slope is saturated.Studies show that

when considering the impact of extreme snow disaster

the safety factor on sliding stability of rock slope changes significantly.The safety factor decreases when the depth of the water in cracks

slope angle and inclination of structural surface increase

and when the shear strength of structural surface decreases.The effect of the frost pressure on the safety factor of sliding slope is more obvious when the depth of water in cracks is greater

slope height is lower

slope angle is smaller

and inclination of structural surface is bigger.At last

several suggestions are given for prevention and control measures of sliding slope.