Reseach of security risk identification based on rough set theory for highway subgrade stability in the slope of reservoir

There are many security risk factors which affect highway subgrade stability in the slope of reservoir. These security risk actors not only are uncertainty and information imperfect, but also have very complex risk characteristic, which rock-soil of primary landform of highway subgrade along the reservoir line is polyphase difference construction and interrelationship of risk factors. In this paper, aiming at these characteristics of security risk of highway subgrade stability in the slope of reservoir, based on rough set theory, a security risk identification model has been established to control the security risk. Application of the model has been provided through the case of security risk identification of highway subgrade stability in the slope of reservoir, in Bainan section Yunyang county, YuBa road. The results of the application demonstrate that small amount of information is required only, analysis and calculation have higher efficiency, and the accuracy can meet the needs of risk analysis through the security risk identification model based on rough set theory. The case confirms that this model can be provided to decision support for the late disaster management of Three Gorges Reservoir.