大型岩盤斜面の動的安定性評価の基礎研究

抄録

This paper discusses the stability of a large rock slope at the time when seismic wave is propagated to such structure.
To examine the dynamic stability of the large slope by adopting modal analysis, we propose the technique how to calculate the vibration modes of the model by finite element method, how to calculate a maximum amplitude of every node in the model from above vibration modes, how to obtain the local safety factors by using the combined displacements to superpose the static displacements and the amplitudes, and how to estimate the dynamic stability by the distribution of the safety factors.
In this paper, a theoretical analysis of dynamic response of the rock structure, definition of local safety factor, adoption of our attempt to process a dynamic system, and the simulation to estimate the dynamic stability are discussed.
The result of this simulation shows that the stability is affected unfavorably with decrease in the order of vibration modes, and that partial sliding may occur near the toe in a large rock slope during severe earthquake of its intensity 6, and gives other various suggestions for future study.