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In this study, the transmission mechanism of impulsive force of a falling rock on a sand layer was investigated by means of Cundall's discrete block method. At first, a falling rock and a sand layer were modeled by elements assembled of rigid cylinders, springs and dashpots, then effects of basic parameters such as spring and damping constants on the impulsive force were discussed under the numerical analysis as a two dimensional problem. Secondly, to explain the real behavior better, the discrete block model was extended to a three dimensional problem using the character of the sand based on experimental results. Finally, it was shown that the transmission mechanism of impulsive force by a falling rock in this method agrees with that in experimental results on various conditions.

IMPULSIVE PROPERTIES OF FALLING ROCKS ON SAND-LAYERS BY MEANS OF CUNDALL'S DISCRETE BLOCK METHOD