Abstract
At the 1995 Hyogo Nanbu Earthquake, the spillways on small earth dam were seriously damaged. In general, spillways are made of heavy concrete materials. Therefore, if they are subjected to earthquake vibration, they can be displaced and failed due to inertia force. The authors of the study proposed the quakeproof lightweight spillway with geogrids and verified its validity by shaking table test. However, the mechanism of reinforced effect remains to be clarified. In this study, the shear deformation of surrounding ground was focused and the cyclic simple shear test was conducted against the proposed method. The small-scale tests with aluminum rods layer and the numerical simulations using the 2-dimensional discrete element method were conducted and mechanism of spillway behavior was clarified by these approaches. Both experiments and analyses found that the spillway displacement is decreased by pull-out resistance of reinforcement materials.
