液状化で生じた砂脈と噴砂に関する-考察  [in Japanese] A STUDY ON SAND DIKES AND SAND BOILS CAUSED BY LIQUEFACTION  [in Japanese]

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Abstract

地震によって液状化した地盤の土質特性などを知るために, 液状化で生じた噴砂を採取して分析することがある. しかし, 遺跡で発掘された液状化砂脈の観察により, 砂脈内の粒度組成と液状化層のそれとは異なることが示され, これを根拠に噴砂を分析することの有効性を否定する意見も示されてきた. この相対する見解を検討するために, ここでは, 2つの地震で生じた3つの液状化地点で実施されたトレンチ調査結果を基に, 砂脈内の土の物理的性質, 砂脈形成のメカニズム, 砂脈と噴砂と液状化層の関係の考察を行った. この結果, 砂脈内の土は分級され下方ほど粗くなり, 液状化層や噴砂とは一致しないこと, また, 砂脈内の土に比べ, 噴砂は液状化層の粒度組成に類似することがわかった.

Soils from sand boils formed during earthquakes were collected and examined to investigate the grain size distribution of the liquefied layers in the ground. However, such effectiveness of sand boils as an index has been questioned, since several observation results of sand dikes excavated in ruins revealed that the grain size distribution of soil in sand dikes differs from that in liquefied layers. In this study, the authors investigated the physical properties of soil in sand dikes, the mechanism of sand dike formation, and the relationship between sand dikes, sand boils and liquefied layers at three sites having liquefied during two earthquakes. As a result, soil particles in sand dikes were found sorted, being coarser in the lower part, and did not coincide with the grain size distribution of the soil particles in the liquefied layers or in sand boils. However, the grain size distribution of soil in sand boils was similar to that in the liquefied layers.

Journal

  • Doboku Gakkai Ronbunshu

    Doboku Gakkai Ronbunshu 638, 311-323, 1999-12-21

    Japan Society of Civil Engineers

References:  22

Codes

  • NII Article ID (NAID)
    10004446290
  • NII NACSIS-CAT ID (NCID)
    AN10014020
  • Text Lang
    JPN
  • Article Type
    ART
  • ISSN
    02897806
  • NDL Article ID
    4960832
  • NDL Source Classification
    ZN1(科学技術--建設工学・建設業)
  • NDL Call No.
    Z16-6
  • Data Source
    CJP  NDL  J-STAGE 
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