In order to analyze the anchors supporting structure’s effects

the 1+016-1+080 navigation route bank high rock slope in Longtan Hydropower Station were respectively computed under the supported and un-supported conditions by two-dimensional plane elastoplastic distinct element method(DEM). In the computation

the stress field

deformation field

plastic yielded zones distribution and stability were respectively calculated under supported and un-supported conditions. At the same time

the anchors axial forces during the excavation steps and the groundwater level effects on the slope deformation are also calculated. The analytical results show that there are obvious differences between the supported and un-supported conditions; and the anchors supporting structure can diminish slope deformation and improve the slope stability. Meanwhile

the ground water level of the slope has the obvious effects on the slope’s deformation and stability. The slope top deformation and the anchors’ inner force are measured during the excavation step and there was a good agreement between the DEM computation values and the surveyed values; for example

the max calculated slope top deformation is 9.48cm while the measured values is 7.55cm; and it is shown that the 2D elastoplastic distinct element method is suitable to calculate the high rock slope problems.