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  1. 紀要論文
  2. 琉球大学農学部学術報告
  3. 28号
  1. 部局別インデックス
  2. 農学部

島尻層泥岩地帯の切土ノリ面対策 : I. 硬度変化からみたノリ面風化(農業工学科)

http://hdl.handle.net/20.500.12000/4058
http://hdl.handle.net/20.500.12000/4058
ada48d44-7dc0-458f-b23f-16d94ddc380d
名前 / ファイル ライセンス アクション
KJ00000162099.pdf KJ00000162099.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 島尻層泥岩地帯の切土ノリ面対策 : I. 硬度変化からみたノリ面風化(農業工学科)
言語 ja
タイトル
タイトル Cutting slope in shimajiri mudstone : I. Weathering and hardness (Department of Agricultural Eegineering)
言語 en
作成者 宜保, 清一

× 宜保, 清一

ja 宜保, 清一

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小宮, 康明

× 小宮, 康明

ja 小宮, 康明

Search repository
Gibo, Seiichi

× Gibo, Seiichi

en Gibo, Seiichi

Search repository
Komiya, Yasuaki

× Komiya, Yasuaki

en Komiya, Yasuaki

Search repository
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 びょう打ち銃と山中式土壌硬度計を使用して泥岩切土ノリ面の風化状態と硬度の関係について調査し, 以下の結果を得た。(1)未風化泥岩のピン貫入量及び硬度指数はそれぞれP=4∿6cm, Y=34∿37mmとなり, 泥岩表土ではそれぞれP=30∿40cm, Y=5∿25mmとなる。(2)ガリ侵食面ではP=3∿8cmとなり, 表層風化部が絶えず雨水によって洗掘されて泥岩が露頭している。(3)切土面は乾燥・湿潤を繰返し, P=15∿20cmの風化層を早期に形成する。深度25cm付近では含水比変化も小さく, 風化速度も緩慢となる。(4)非植生ノリ面ではP=10∿37cmが得られ, 風化土の崩落や小規模崩壊によってノリ面が絶えず後退している。(5)植生ノリ面ではP=10∿17cmが得られ, 植生の被覆効果によって表層及び内部の泥岩の乾燥化が抑制され, 風化速度も緩慢となる。(6)地すべり多発斜面の軟化泥岩の硬度はP=25∿30cm, Y=24∿26mmを示し, かなり強度を低下させている。
内容記述
内容記述タイプ Other
内容記述 Based on the idea that strength is the best index of weathering and implies a hardness when the degree of weathering is classified from the engineering point of view, this report deals with the relationship between the progressive state of weathering and hardness in the cutting slope of Shimajiri mudstone. Measurement of the hardness was conducted by using a pin penetration gun and a soil hardnessmeter of Yamanaka-shiki. Results obtained are as follows : 1. The pin penetration distance P is expressed in P=4-6cm, and the measured hardness Y in Y=34-37mm, respectively, in unweathered Shimajiri mudstone; and they have been P=30-40cm, and Y=5-25mm, respectively, in the soil layer from the mudstone. 2. P=3-8cm has been obtained in the face of a gully formed by erosion. 3. The cut plane in the mudstone repeats drying and wetting and forms soon a weathered layer with the hardness of P=15-20cm 4. In the slope without vegetation, P=10-37cm has been obtained, and the face of the slope keeps going back by falling of weathered soil in the mudstone and by small-scale collapse. 5. In the slope covered with vegtation P=10-17cm has been obtained. It is observed that drying of the mudstone is suppressed by the covering effect. 6. The softened mudstone has such hardness as P=25-30cm and Y=24-26mm, and its strength drops considerably in comparison with that of non-softened mudstone.
内容記述
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/20.500.12000/4058
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
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
収録物名
言語 en
収録物名 The Science Bulletin of the Faculty of Agriculture. University of the Ryukyus
書誌情報
号 28, p. 151-161, 発行日 1981-11-30
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