噴砂の粒度組成  [in Japanese] GRAIN SIZE DISTRIBUTION OF ERUPTED SANDS DUE TO LIQUEFACTION  [in Japanese]

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Abstract

液状化によって生じた噴砂は, その発生原理から液状化した土層の情報を多く保持し, しかも, 採取が容易であるので数多くの試料の分析が可能であり, 採取方法などに注意すれば, 液状化しやすい粒度組成を推定するための大きな手掛かりになると考えられる. このような理由から, 噴砂を数多く収集しその粒度組成について分析を行った. 対象とした噴砂は, 近年発生した13地震の液状化地点より採取されたもので, 合計823試料である. 本論文では, 噴砂の採取地点と粒度組成を示し, 海岸埋立地に代表される若齢な地盤と沖積地盤に代表される地盤で採取された噴砂の違い, 噴砂の粒度組成の特徴および範囲とその工学的意味を明らかにし, 液状化し得る粒度組成の細粒側の下限値を見出した.

A sand sample erupted by liquefaction is one of the keys to estimate the grain size distribution of liquefiable soils. When the sampling of erupted sand is appropriately performed, the erupted sand can provide substantial information on liquefied layers. Moreover, since such a sample is easily obtainable from the liquefied site, reasonable evaluation of the liquefiable grain size distribution based on a large number of samples is possible. In this study, using 823 samples obtained from liquefied sites due to 13 earthquakes, the following aspects were examined: 1) the difference in grain size distribution between samples taken from young aged grounds (e. g., reclaimed lands), and samples taken from grounds composed mainly of Holocene deposits; 2) the properties of grain size distributions of the erupted sands; and 3) comparison with the conventional criteria of grain size distribution of liquefiable soil. It was found that there exist finer limits in the grain size distribution of liquefiable soils for young aged ground and Holocene deposits, respectively.

Journal

  • Doboku Gakkai Ronbunshu

    Doboku Gakkai Ronbunshu 722, 129-147, 2002-12-21

    Japan Society of Civil Engineers

References:  43

Cited by:  2

Codes

  • NII Article ID (NAID)
    10010460424
  • NII NACSIS-CAT ID (NCID)
    AN10014020
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • ISSN
    02897806
  • NDL Article ID
    6417345
  • 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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