Seismic response of valley fills to strong earthquakes on residential region in Tokyo

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  • 谷埋め盛土における地震動と間隙水圧の観測
  • タニ ウメ モリツチ ニ オケル ジシンドウ ト カンゲキ スイアツ ノ カンソク

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Both earthquake ground motion and pore water pressure observations in valley fill were conducted in the southwestern Tokyo region from 2005 to 2011. The Nakane observatory is situated on the Musashino terrace. The Todoroki observatory about 2km distance from the Nakane is settled on the valley fill of 4meters depth and on the alluvial sediments of 6meters continued from the Pleistocene terrace. The difference in the earthquake ground motion between records on the both observatories varied with earthquakes. Earthquake response analysis by FLUSH using cyclic undrained triaxial test results on the undisturbed soil samples revealed that the amplification of the maximum ground acceleration (PGA) on the valley fill were controlled by the surficial ground structure and the characteristics of earthquakes. The non-linear response of excess pore water pressure in valley fill was observed during the strong earthquake such as the 2005 Chibaken-hokuseibu earthquake. These basic information will be valuable for discussing on prediction of valley fills type landslides induced by strong seismic motion in urban region.

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