Investigation, planning, and design projects for drop of groundwater level method as a countermeasure against liquefaction in wide urban area.

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  • 市街地における液状化対策としての地下水位低下工法の調査･計画･設計プロジェクト
  • - Report of experiments by countermeasure against liquefaction with reclaim history -
  • －干拓履歴を持つ地盤の液状化対策・試験施工による実証実験の検討報告－

Abstract

<p>Severe liquefaction disaster, caused by the Great East Japan Earthquake, occurred at the residential area of 200ha in Hinode district, Itako city, Ibaraki prefecture, in March 11 2011. Itako city aimed to restrain recurrence of liquefaction, and began project countermeasure against liquefaction in urban area used “the Great East Japan Earthquake disaster reconstruction subsidy” in February 2012. In this project, we focused on the development history of Hinode district, and considered that the “groundwater level drop method” is suitable for this area. We also verified its feasibility. After the verification, the countermeasure work against liquefaction was carried out. In April 2018, the liquefaction measures review committee confirmed drop of groundwater level, the work which was unprecedented as countermeasure against liquefaction in the existing urban area was completed. The series of circumstances were referred, in decision of “the guidance for countermeasures against liquefaction in urban area”, which is the guideline of the Japanese government. The guidance is used as a guide in followed other cases. This report reports the process of these series of projects.</p>

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