VIBRATION ANALYSIS OF LAMINATED BLOCKS BY DISCONTINUOUS DEFORMATION ANALYSIS

S.AKAO ¹ , Y.OHNISHI ¹ , S.NISHIYAMA ¹ , T.YANO ¹ , T.FUKAWA ¹ , T.NISHIMURA ² and K.URANO ²

¹ School of Urban and Environment Engineering, Kyoto University, Japan
(e-mail of corresponding author: akao@geotech.kuciv.kyoto-u.ac.jp )

² Hazama Corporation, Japan

An earthquake is one of the triggers of rock slope failure and rockfall which cause heavy damage to human beings. In order to conduct a safety assessment for the sake of protecting human beings against these disasters, simulation of the behavior of rock masses during earthquakes is necessary. The purpose of this study is investigation of the applicability of discontinuous deformation analysis (DDA), which can analyze accurately static and dynamic problems and is expected to come into practical use, to vibration analysis and its characteristics. By comparing vibration response of the laminated blocks in the shaking table tests with results of simulation by DDA, the applicability was proved and knowledge about applying DDA to vibration analysis was acquired.

First, the shaking table tests were performed to study vibration response of simple laminated blocks. Two types of laminated blocks were used, which had different shapes and physical property values. Some sinusoidal input motions which had different frequency and amplitude were used. From these tests, it was proved that the blocks had various behaviors, stability or toppling, depending on input motions and the modes of failure were not only sliding but rotation.

Next, the behaviors of blocks in the tests were simulated...