This paper describes a new analytical method to elucidate the dynamic response of railroad ballast under high seismic loads. A series of numerical simulations of shaking table tests for single grained crushed stone were performed with DDA. The applicability of discontinuous am lysis to the dynamic behavior of coarse granular materials and the seismic bearing capacity of coarse granular materials were discussed in terms of the mechanics of granular materials. As the result, it was revealed that liscontinuous analysis was an effective method to simulate the dynamic behavior of coarse granular materials in earthquakes, and that the seismic bearing capacity was closely related with the mobility of individual particles. These results indicate that the evaluation of the seismic bearing capacity and ductility of coarse granular mterials needs to estimate the mobility of constituent particles.
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