東京層砂層の液状化の痕跡調査と一考察  [in Japanese] TRACES OF LIQUEFACTION OF TOKYO FORMATION SAND LAYER AND ITS CONSIDERATION  [in Japanese]

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Abstract

東京都新宿区四谷の江戸城四谷御門外の一連の遺跡調査において, 江戸城外堀の盛土周辺で地震の痕跡が検出された. 地震の痕跡には, 地割れ, 地滑りのほか, 噴砂脈が認められた. 現地調査, サウンディング, 粒度・比重・重鉱物・珪藻などの土質分析, および周辺の地質調査資料に基づき, 噴砂脈の供給源が更新統 (洪積層) である東京層にあることを確認した. 考古学・地震学・地盤地震工学の観点から, 地震の発生時期を特定した. 液状化しにくいと考えられていた洪積砂層も強地震動の下では液状化しうることを示した. 有史以来の歴史地震で洪積層が液状化したことを確認した初めての例である.

Some earthquake traces were discovered at around the embankment of outside moat of the Edo castle in a series of the remain investigation for the Yotsuya-Gomongai of the Edo castle at Yotsuya, Shinjuku, Tokyo. Sand dikes, fissures and a landslide were recognized as earthquake traces. According to site investigation, sounding and soil analysis for grain size, heavy metal and diatom, it was confirmed that source of supply of sand dykes was Tokyo Formation sand layer which is Pleistocene. The earthquakes induced the traces was specified from stand points of archaeology, seismology and geotechnical earthquake engineering. It was shown that Pleistocene, so called diluvial deposit, which had been thought hard to liquefy, could liquefy under severely strong motions.

Journal

  • Doboku Gakkai Ronbunshu

    Doboku Gakkai Ronbunshu 582, 247-263, 1997-12-21

    Japan Society of Civil Engineers

References:  36

Cited by:  1

Codes

  • NII Article ID (NAID)
    10001865222
  • NII NACSIS-CAT ID (NCID)
    AN10014020
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • ISSN
    02897806
  • NDL Article ID
    4365444
  • NDL Source Classification
    ZN1(科学技術--建設工学・建設業)
  • NDL Call No.
    Z16-6
  • Data Source
    CJP  CJPref  NDL  J-STAGE 
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