Abstract:The reclamation road-dike on slope is a common encountered roadbed mode in highway construction in mountainous area. And a great deal of roadbed deformation and destruction always have relationship with the reclamation mode,especially the high reclamation road-dike on slope. According to the practical reclamation conditions of certain segment of No.108 national highway and combining with the familiar destruction mode of reclamation road-dike on slope in highway construction in mountainous area,by using the basal contact friction experimental method,the systematic and general analysis of the evolution and mechanical mechanism of settlements are carried out. The result shows that the toe of slope is the weakest place of destruction,and with the degree of slope of subterrane increase,the sliding tendency,the degree of deformation,destruction and stress concentration increase apparently. Furthermore,for verifying the reliability of the physical simulation results,the finite element method(FEM) is used for comparison. The results show that they have good consistency.