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Abstract Firstly，the calculation formula for coefficient of overturning stability under the condition of extreme snow disaster is derived. Secondly，the regularity for coefficient of overturning stability with the changes of frost depth is revealed，which considers different slope angles，slope heights，dip angles of the slide plane，and depths of tension fractures for saturated rock slope. Diagrams which express the relationship between the coefficients of overturning stability and geometric factors are drawn when the rock slope is saturated. Then the variation of the coefficient of overturning stability for unsaturated rock slope is revealed，which also considers different geometric factors such as frost depth，slope angle，slope height，dip angle of the slide plane，and the water-emerging depth of tension fractures and so on. The conclusions can be drawn that the coefficient of overturn stability of rock slope changes significantly when considering the impact of extreme snow disaster. The bigger the frost depth，dip angle of the slide plane，the depth of tension fractures and slope height are，the smaller the coefficient of overturning stability is. The smaller the slope angle is，the smaller the coefficient of overturning stability is. The frost depth is one of the main factors which impact the overturning stability of rock slopes.
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Received: 25 February 2010
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