Many unstable slopes exist about 1000 slope failures each year have occurred in Japan. An about 90% of the failed slope is natural slope having the tree vegetation and the failure occurred in the surface ground within 3 meters in depth. The slope failure is mainly caused from the heavy rain and small earthquake. While the failures have to be prevented, the natural environment such as trees and vegetations on the slope has to be also maintained. Therefore, the retaining structure and the shotcrete, which have to cut the trees on the slope, are not suitable from the point of view of the conservation of natural state. From this point, the rock bolt and rope net method is developed to protect the slope failure with the nature conservation. The purpose of this research is to understand the mechanism of the reinforcement effect of rock bolt setting of the method. The shear test by the model 1/10 scale is conducted. As a result, it is clarified that the rock bolt setting has a large effect on the slope behavior.
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