STABILITY EVALUATION OF HIGH SLOPE FOR HIGHWAYS AND OPTIMIZED SUPPORT DESIGN

The high slopes of highways have many features,such as the large number,the complicated geological conditions,the high-speed construction,etc..Based on the feature that deformation occurs frequently during construction period,a perfect operation method of optimized design is proposed with a specific case of Tangkou— Tunxi expressway construction in Southern Anhui Province.Through the work flowchart of general survey of high slope→proposing advices on partitions of optimizing design→choosing key slope→optimized analysis of key slope,the research results of optimized design for high slope are achieved.With the efforts of employer,designer and constructer,the scientific research results are employed quickly in engineering construction.Based on the combination of deformation theory and strength theory for slope engineering,the stability evaluation and geohazard controlling methods for key high slope are performed on the basis of geologic process principle.Through the stability analysis of deformation theory for slope,the modes of slope deformation and failure,the development processes of deformation and failure can all be determined.Combining with feedback of construction and monitoring data,both the present stability state and potential position of sliding surface can be analyzed.Afterwards,using the analytical method of strength stability,the required data for the design of slope support can be achieved;then the design can be optimized.Subsequently,in terms of deformation theory and the feedback information of construction and monitoringt,he support results can be verified;and the further optimization can be realized.The detailed practice shows that the proposed method can realize high-speed excavation of high slope and normal service for highways.