Abstract: Considering the particularity and randomness of the influencing factors on the stability of rock slopes in areas with low temperature, high altitude and high seismic intensity, an evaluation method for the rock slope stability in these areas is proposed using the normal cloud model theory approach. With the understanding of engineering geology features, topographic conditions, engineering environments, eleven potentia  stability influence factors, such as, degree of weathering of rock and soils, seismic intensity, coefficient of freeze resistivity and vegetation coverage, were selected for the slope stability evaluation. The normal cloud model and the weight of each factor were used to determine the degree of certainty and the slope stability class. This approach was applied to the evaluation of the rock slope stability between stations K53 and K78 in Wu-Yu Expressway Project. The satisfactory evaluation results were obtained, and the results are consistent with the construction observations.

Key words: normal cloud model, high altitude low temperature and high seismic intensity areas, rock slopes, stability evaluation, uncertainty