The study of modeling and optimization methods of the highway soil slope stability has been carried out based on the reliability theory in this paper, because of the extensive uncertainties of the cost and safety factors in highway slope design. First, considering the overall construction cost and risk cost, using the cost-benefit analysis method, taking the minimum total expected cost as the objective function, using the slope-type and slope-ratio as design variables and the reliability index of the slope stability as the main constraint condi...
