The objective of the paper is to make the strengthening effect and the collapse mechanism in the slope reinforced with anchor works clear. Response characteristics of the slope model were analized based on the results obtained by the shaking table tests under 1G field for the slope models reinforced by anchor works. Furthermore, the effect was verified by using MPM which is possible to evaluate the behavior from large deformation to collapse. Among the slope models which carried out the shaking table tests, the slope models for not only small scale but also medium scale were used. It is found that the collapse of the reinforced slope model is caused by the following process. First of all, the static tensile force of anchor decreased after the weak layer became soft by the nonlinear behavior of the soil . Then the dynamic response of tensile force became larger due to the rise of vibration in the ground over the weak layer. Finally the tensile force of the anchor reached to the failure strength. Based on MPM analysis, it is found that the tightening effect is lager as the strengthening effect of anchor work, and that the collapse behavior is possible to reappear.
