Departmental Bulletin Paper 地盤の液状化挙動に与える影響に関する模型振動実験

田口, 善文

Liquefaction is a phenomenon in which the water pressure between particles rises due to the shake of large earthquakes due to the high groundwater level and loose sandy ground and becomes like a liquid, as a result, buildings and roads may settle, and light structures under the ground float. Recently, liquefaction damage occurred in Urayasu City in Chiba Prefecture, which was far away from the hypocenter of the 2011 off the Pacific coast of Tohoku Earthquake. On the other hand, in Mie prefecture, within the next 30 years the probability of occurrence of a large earthquake of M8 ~ M9 with the Nankai-Trough as hypocenter is expected to be around 60 ~ 80%. In order to prepare for the Tokai, Tonankai or Nankai earthquake that is expected to occur in the future, the author conducted a model test using a small shaking table about the liquefaction phenomenon of the sandy ground which is expected to occur in the sand ground along the coast, basic experiments were carried out on the ease of liquefaction phenomena by variously changing the input earthquake wave, vibration frequency, and particle size of the model ground.

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