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  1. 紀要論文
  2. 琉球大学農学部学術報告
  3. 38号
  1. 部局別インデックス
  2. 農学部

国頭マージ締固め土の透水係数の異方性について(生産環境学科)

http://hdl.handle.net/20.500.12000/3837
http://hdl.handle.net/20.500.12000/3837
f9c814a3-1c12-462f-8ffd-59c674daac13
名前 / ファイル ライセンス アクション
KJ00000161667.pdf KJ00000161667.pdf
Item type デフォルトアイテムタイプ(フル)(1)
公開日 2008-02-14
タイトル
タイトル 国頭マージ締固め土の透水係数の異方性について(生産環境学科)
言語 ja
作成者 宮城, 調勝

× 宮城, 調勝

ja 宮城, 調勝

前原, 光博

× 前原, 光博

ja 前原, 光博

Miyagi, Norikatsu

× Miyagi, Norikatsu

en Miyagi, Norikatsu

Maehara, Mitsuhiro

× Maehara, Mitsuhiro

en Maehara, Mitsuhiro

アクセス権
アクセス権 open access
アクセス権URI http://purl.org/coar/access_right/c_abf2
内容記述
内容記述タイプ Other
内容記述 締固めた土の透水係数の異方性については,締固め土のミクロな構造論から,層状不均一の発生論までいろいろ論議されている。この研究では,締固めた試料を深さごとに細かく密度を測定することによって,締固めエネルギーの伝播が深さ方向に急速に低減することを明らかにした。またそのことは透水係数の異方性が,主として成層構造からくる層状不均一性によることを裏付けるものと判断している。この研究で得られたことをまとめてみると以下のようになる。1. 土の密度は,旧JISの試験法によるモールドの内部でも大きな不均一を生ずる。不均一性の程度は,最適含水比の乾燥側で大きく,反対に湿潤側では小さく出る傾向にある。2. 直径10cmのモールドの一層締固めの結果は,壁面摩擦もあるが,締固め荷重の到達は22cm程度の深さにあった。3. 圧密試験による透水係数は練り返し試料については,実測値とよく一致するが,風乾土および加水により含水比調整をした試料については大きな差異を生じた。4. 国頭マージの透水係数の異方性は,K_vに対してK_hはせいぜい2倍程度であった。しかし成層構造の不均一性を考慮すると,転圧時の巻き出し厚によっては問題になるほど大きくなる可能性がある。以上の結果を得たが,これらに対して実際に現場で対応できることは,巻き出し厚を薄くすることと,異方性を防ぎ得る施工機械の選定であろうと考える。
内容記述タイプ Other
内容記述 Generally, there is a difference between vertical and horizontal coefficient of permeability in compacted soils. The several reasons of its anisotropy of permeability had been reported in the past. In this paper, transmission of compaction energy for depth of compacted soil is considered by the method which investigate dry density with cutting soil to 1cm thikness piece at right angles to the direction of the mold. The results are as follows; 1) The dry density of slice soil changed in the range of 0.92-1.08 as compared with average dry density in mold. It seems that this difference of dry density bring on anisotropy of permeability 2) In the relation between coefficient of permeaility and void ratio, measured values agree with values based on consolidation test in remould soils. But in the soil conditions of optimum moisture content and air dried, measured values become larger than values based on consolidation test with the increase of void ratio.
内容記述タイプ Other
内容記述 紀要論文
出版者
言語 ja
出版者 琉球大学農学部
言語
言語 jpn
資源タイプ
資源タイプ departmental bulletin paper
資源タイプ識別子 http://purl.org/coar/resource_type/c_6501
出版タイプ
出版タイプ VoR
出版タイプResource http://purl.org/coar/version/c_970fb48d4fbd8a85
識別子
識別子 http://hdl.handle.net/20.500.12000/3837
識別子タイプ HDL
収録物識別子
収録物識別子タイプ ISSN
収録物識別子 0370-4246
収録物識別子タイプ NCID
収録物識別子 AN00250548
収録物名
言語 ja
収録物名 琉球大学農学部学術報告
書誌情報
号 38, p. 195-201, 発行日 1991-12-04
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