不整形地盤の振動特性 : 油圧制御起振機による強制振動試験に関する研究(2)

概要

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Scattering of harmonic waves by subsurface irregularities is studied experimentally with the detailed measurements of a surface ground motion generated by forced vibration of a reinforced concrete model footing placed on a subsurface irregular ground. Each of three different footings was excited in three kinds of directions to generate different patterns of wave propagation. Observations indicate that the variations of measured velocity amplitude are most influenced by SH wave motion among various types of propagating waves and that they are highly frequency dependent. They also indicate that the measured velocity amplitudes do not always decay monotonously with increasing the source-receiver distance and that it is the measurement points of the filling ground in the vicinity of interface between the cutting ground and filling ground that surface ground motions are significantly amplified.
1991-08-30