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  1. 紀要論文
  2. 琉球大学農学部学術報告
  3. 24号
  1. 部局別インデックス
  2. 農学部

土塊の乾燥・収縮について(農業工学科)

http://hdl.handle.net/20.500.12000/4248
http://hdl.handle.net/20.500.12000/4248
75e6ccee-83bb-4684-90b3-51fa500b0845
名前 / ファイル ライセンス アクション
KJ00000162606.pdf KJ00000162606.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 土塊の乾燥・収縮について(農業工学科)
言語 ja
作成者 宜保, 清一

× 宜保, 清一

ja 宜保, 清一

Gibo, Seiichi

× Gibo, Seiichi

en Gibo, Seiichi

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 比較的密度の高い領域の作成供試土塊について乾燥・収縮特性を追求し, 次の結果を得た。(1)土塊の乾燥に伴なう含水比減少曲線の最大曲率の点は減率乾燥第1から第2段への転移点に相当する。(2)限界含水比や収縮限界はTable 3に示すとおり, コンシステンシー指数(Ic)や乾燥密度(γd)の影響をほとんど受けない。(3)土塊の収縮は限界点に達する相当以前に終了しており, 収縮限界と限界含水比は一致しない。(4)収縮率(Pc)とIcの間にはFig.5に示すような関係があり, 可塑性の大きな土程Pcが大きい。(5)体積変化係数CvcはIcやγdと無関係だが, 練返しの影響を多少受ける。各試料における。Cvc(W=0のCvc)の平均値はKinとYagajiで比較的大きく, Tomigusukuで小さい。(6)配列指数によって検討すると, 土粒子はIc=0.68∿1.15の範囲で等方配列を示し, 1.15以上では平行配列を示す。
内容記述タイプ Other
内容記述 Experimental studies were made on the drying and shrinkage characteristics of soil blocks. The results obtained are as follows; 1. The water content at the maximum curvature of the water content-time curve corresponds to that in the boundary from the first stage of drying in decreasing rate to the second stage of drying in decreasing rate. 2. The critical water content and shrinkage limit are not affected very much by the consistency index (I_c) and dry density (γd) as showed in Table 3. 3. The shrinkage behavior of the soil blocks finishes considerably before reaching the critical water content. 4. The percentages of cubical contraction (P_c) are related to I_c as showed in Fig. 5,the more plasticity of a soil the larger Pc. 5. The coefficients of volumetric changes (C_<vc>) of the soil blocks have not to do with I_c and γd, but there is some difference in the shrinkage behavior due to remoulding, the averages of _oC_<vc>-values (C_<vc> at w=0) of each of the samples are relatively large in Kin and Yagaji, and very small in Tomigusuku, Okinawa Island. 6. On the basis of the coefficient of particle orientation, the particle arrangement during shrinking of the soil block of I_c in the range of 0.68-1.15 has a isotropic arrangement and that above 1.15 is parallel.
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/20.500.12000/4248
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 24, p. 427-438
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