REPRODUCTION ANALYSIS BY MODIFIED NEWMARK METHOD TO SIMULATE EARTHQUAKE-INDUCED FAILURE OF HIGH CUT SLOPE CONSISTING OF CLAYEY SOILS

DOI Web Site 4 References
  • NAKAMURA Hiroshi
    東日本旅客鉄道株式会社 構造技術センター 耐震土構造PT
  • MIHIRA Shingo
    株式会社複合技術研究所 第二設計部
  • HAYA Hiroshi
    ジェイアール東日本コンサルタンツ株式会社 メンテナンス事業部 構造物検査室
  • YAMAUCHI Shinya
    東日本旅客鉄道株式会社 構造技術センター 耐震土構造PT
  • KOSEKI Junichi
    東京大学 大学院 工学系研究科 社会基盤学専攻

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Other Title
  • 粘性土高切土の地震時崩壊事例を対象とした修正Newmark法による再現解析

Abstract

 A reproduction analysis from a view point of practical design was conducted on a case history where a high railway cut slope consisting of clayey soils failed during the 2011 Off the Pacific Coast of Tohoku Earthquake. The extent of the damage was so large that its restoration works required significant time.<br> Therefore, a series of in-situ geotechnical survey and laboratory soil testing on undisturbed samples were conducted, and a two-dimensional earthquake response analysis was executed while considering the strong motion record that was observed nearby. Based on the laboratory test results, the properties of strength reduction to be mobilized along a failure plane were also formulated, and earthquake-induced sliding displacement was evaluated using modified Newmark method. As a result, the damage extent of the failed slope could be reasonably simulated.

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