Analysis of characteristics of retrogressive landslide and comparison between active and passive reinforcements

Base on the analysis of the process of retrogressive landslide,it shows that the characteristics of retrogressive landslide are developed from underside to upside;and its scope becomes larger and larger.The treatment to retrogressive landslide is passive and active reinforcements,but some problems will be brought in by passive reinforcement,such as the decline of shear strength of sliding surface,the expanse of sliding range,the increase of passive reinforcement force,the loss of project budget and the destruction of environmental resources.The inherent strength of potential sliding surface can be utilized by active reinforcement;and then the project budge will be decreased.When passive reinforcement is used in project,the developing process of retrogressive landslide should be considered,the initial sliding mass must be reinforced effectively,the retrogressive mass afterwards should be treated by principle of compensatory reinforcement.