不整形な層境界を有する地盤の増幅特性

概要

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The effects of lateral irregularities of interface between layers on surface ground motions are investigated using the finite element analysis. The equivalent wave velocities and 1/Q values identified under the assumption of a stratified layer are evaluated in the case of sine-shaped and stochastic undulated interface models. The convex interface increases equivalent wave velocity and 1/Q value, but the concave interface shows the opposite effects. These effects depend on the average and bounds of the depth of a layer, and the lateral wavelength of a sine-shaped interface. The equivalent wave velocities and 1/Q values are approximately normally distributed and depend on mean and variance of the depth of layer for stochastic interface model. If artificial neural networks inputting the normalized depths in the vicinity of an estimated point learn the analytical results, the equivalent wave velocities and 1/Q values are evaluated automatically. The distribution of influenced horizontal range of lateral interface irregularities is considerably different between the equivalent wave velocities and 1/Q values.
1998-12-30