Vibration Characteristics and Earthquake Response of a Fill Dam Having a Semi-Circular Dam Axis

Abstract eng:
Shin-Yamamoto dam located in the near field of 2004 Niigata-ken Chuetsu Earthquake sustained serious damage such as large settlement and liquefaction. It is 42.4m high fill dam having a semi-circular dam axis, constructed in 1990. This study aims to find vibration characteristics of the dam and to estimate the cause of the damage. For these purposes, micro-tremor measurements and 3-D numerical simulations were conducted. The H/V spectral ratios, often used to estimate ground motion characteristics from micro-tremor data, indicated the vibration periods in the directions normal and parallel to dam axis were slightly different. A 3-D dynamic analysis was conducted to estimate response of the dam to the main shock. The result showed that earthquake response of the right half side of the dam was supposedly stronger in the dam-axis direction than in the normal direction, but that it was reversed on the left half side. Frequency response functions derived from numerical analysis had similar characteristics from the micro-tremor measurements. Finally, a high correlation was found between the earthquake response intensity in the normal direction and the earthquake-induced settlement.

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