Structural Stability Evaluation of Isolation-type Waste Landfills during a Large Earthquake

DOI Web Site 2 References
  • Ishimori Hiroyuki
    Material Cycles Division, National Institute for Environmental Studies
  • Xu Min
    Mizuho Research & Technologies, Ltd.
  • Manabe Takashi
    Mizuho Research & Technologies, Ltd.
  • Ishigaki Tomonori
    Material Cycles Division, National Institute for Environmental Studies
  • Endo Kazuto
    Fukushima Regional Collaborate Research Center, National Institute for Environmental Studies
  • Yamada Kazuo
    Fukushima Regional Collaborate Research Center, National Institute for Environmental Studies
  • Yamada Masato
    Material Cycles Division, National Institute for Environmental Studies

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Other Title
  • 巨大地震発生時における遮断型最終処分場の構造安定性評価

Abstract

A structural stability evaluation of isolation-type waste landfills against Level 1 and Level 2 seismic motions was conducted using seismic analysis. The material thickness of reinforced concrete used at waste containment facilities has been changed from 150 mm to 350 mm due to the revision of structural standards in 1998. Focusing on isolated landfill sites before and after this revision of Japanese standards, the effects of ground and landfill conditions on the width of the cracks that become sources of hazardous leakages were investigated. It was found that if sound strength of the RC was maintained at the regulated standard, the crack width remained at less than 0.5 mm, the design tolerance level. However, the fact that the waste layer was filled with water led to the development of a crack that reached the maximum largest width for an earthquake. This means that this method for analysis may be applicable for design and also indicates that it is an effective means for making the various conditions more precise. However, it is important to take into consideration the surrounding ground conditions in response to demands for improved safety, including suppression of rainwater infiltration, reduction of seismic loads, and prevention of outflow for chemical substances in landfill waste.

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