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Several rocky coasts of Okinawa-jima, Miyako-jima and Kikai-jima were selected as the investigated areas. Field measurements were carried out for the cliff height, the depth of notches, the length of fallen blocks and longitudinal wave velocity in rock mass. The cliff height, notch depth and block length range from 2-23 m, 2-9 m and 4-13 m, respectively. Physical and mechanical properties of the cliff material were measured through the laboratory tests. The rock strength drastically decreases with increasing size of specimen, i.e., Ryukyu Limestone has the scale effects in rock strength. Combining the laboratory results of strength reduction due to scale effect and the results of the longitudinal wave velocity obtained from both laboratory and field tests, an equation was derived for estimating of the rock mass strength. Cliff instability was analyzed using a beam analysis model. The stability analysis using the strength of rock mass ignoring scale effects could not well explain cliff failures. Considering tension cracks behind cliff, a new equation for stability analysis was derived. Substituting the estimated rock mass strength and unit weight of cliff material into the equation, we obtain the critical stability lines in cliff height and critical notch depth relationships. Results show that the data from the present cliff profile was plotted in the stable area, while the length and breadth of fallen blocks was plotted on the critical lines. This leads to the conclusion that the analysis of beam failure type, which takes account of the rock mass strength and tension crack, would provide a useful framework for predicting the critical notch depth of cliff made of Ryukyu Limestone.", "subitem_description_type": "Other"}, {"subitem_description": "\u672a\u516c\u958b\uff1aP.71\u4ee5\u964d\uff08\u629c\u5237\u8ad6\u6587\u306e\u305f\u3081\uff09", "subitem_description_type": "Other"}, {"subitem_description": "\u7814\u7a76\u5831\u544a\u66f8", "subitem_description_type": "Other"}]}, "item_1617186643794": {"attribute_name": "Publisher", "attribute_value_mlt": [{"subitem_1522300295150": "ja", "subitem_1522300316516": "\u524d\u9580\u6643"}]}, "item_1617186702042": {"attribute_name": "Language", "attribute_value_mlt": [{"subitem_1551255818386": "jpn"}]}, "item_1617186783814": {"attribute_name": "Identifier", "attribute_value_mlt": [{"subitem_identifier_type": "HDL", "subitem_identifier_uri": "http://hdl.handle.net/20.500.12000/12208"}]}, "item_1617186920753": {"attribute_name": "Source Identifier", "attribute_value_mlt": [{"subitem_1522646500366": "NCID", "subitem_1522646572813": "BA74535416"}]}, "item_1617258105262": {"attribute_name": "Resource Type", "attribute_value_mlt": [{"resourcetype": "research report", "resourceuri": "http://purl.org/coar/resource_type/c_18ws"}]}, "item_1617265215918": {"attribute_name": "Version Type", "attribute_value_mlt": [{"subitem_1522305645492": "VoR", "subitem_1600292170262": "http://purl.org/coar/version/c_970fb48d4fbd8a85"}]}, "item_1617605131499": {"attribute_name": "File", "attribute_type": "file", "attribute_value_mlt": [{"accessrole": "open_access", "download_preview_message": "", "file_order": 0, "filename": "14580103-3.pdf", "future_date_message": "", "is_thumbnail": false, "mimetype": "", "size": 0, "url": {"objectType": "fulltext", "url": "https://u-ryukyu.repo.nii.ac.jp/record/2004848/files/14580103-3.pdf"}, "version_id": "d197d565-f85b-4d88-9fcf-4ad252a10d86"}, {"accessrole": "open_access", "download_preview_message": "", "file_order": 1, "filename": "14580103-2.pdf", "future_date_message": "", "is_thumbnail": false, "mimetype": "", "size": 0, "url": {"objectType": "fulltext", "url": "https://u-ryukyu.repo.nii.ac.jp/record/2004848/files/14580103-2.pdf"}, "version_id": "3ec9b609-3e0d-4d96-9e77-c71c5b9224d9"}, {"accessrole": "open_access", "download_preview_message": "", "file_order": 2, "filename": "14580103-1.pdf", "future_date_message": "", "is_thumbnail": false, "mimetype": "", "size": 0, "url": {"objectType": "fulltext", "url": "https://u-ryukyu.repo.nii.ac.jp/record/2004848/files/14580103-1.pdf"}, "version_id": "ca9b6cf6-a499-41cd-8ee1-23de990a7565"}]}, "item_title": "\u7409\u7403\u5217\u5cf6\u306b\u304a\u3051\u308b\u77f3\u7070\u5ca9\u304b\u3089\u306a\u308b\u5d16\u306e\u5d29\u843d\u5f8c\u9000\u306b\u95a2\u3059\u308b\u7814\u7a76", "item_type_id": "15", "owner": "1", "path": ["1642838403123", "1642838405494"], "permalink_uri": "http://hdl.handle.net/20.500.12000/12208", "pubdate": {"attribute_name": "PubDate", "attribute_value": "2009-08-31"}, "publish_date": "2009-08-31", "publish_status": "0", "recid": "2004848", "relation": {}, "relation_version_is_last": true, "title": ["\u7409\u7403\u5217\u5cf6\u306b\u304a\u3051\u308b\u77f3\u7070\u5ca9\u304b\u3089\u306a\u308b\u5d16\u306e\u5d29\u843d\u5f8c\u9000\u306b\u95a2\u3059\u308b\u7814\u7a76"], "weko_shared_id": -1}
  1. その他
  1. 部局別インデックス
  2. 法文学部

琉球列島における石灰岩からなる崖の崩落後退に関する研究

http://hdl.handle.net/20.500.12000/12208
http://hdl.handle.net/20.500.12000/12208
fe06bfa8-1bfe-47ad-8d3e-b5d0e85d37e1
名前 / ファイル ライセンス アクション
14580103-3.pdf 14580103-3.pdf
14580103-2.pdf 14580103-2.pdf
14580103-1.pdf 14580103-1.pdf
Item type デフォルトアイテムタイプ(フル)(1)
公開日 2009-08-31
タイトル
タイトル 琉球列島における石灰岩からなる崖の崩落後退に関する研究
言語 ja
作成者 前門, 晃

× 前門, 晃

ja 前門, 晃

廣瀬, 孝

× 廣瀬, 孝

ja 廣瀬, 孝

松倉, 公憲

× 松倉, 公憲

ja 松倉, 公憲

Maekado, Akira

× Maekado, Akira

en Maekado, Akira

Hirose, Takashi

× Hirose, Takashi

en Hirose, Takashi

Matsukura, Yukinori

× Matsukura, Yukinori

en Matsukura, Yukinori

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
主題
言語 ja
主題Scheme Other
主題 崩落後退
言語 ja
主題Scheme Other
主題 ノッチ
言語 ja
主題Scheme Other
主題 安定解析
言語 ja
主題Scheme Other
主題 岩石物性
言語 ja
主題Scheme Other
主題 寸法効果
言語 ja
主題Scheme Other
主題 石灰岩
言語 ja
主題Scheme Other
主題 クラック
言語 ja
主題Scheme Other
主題 崖
言語 ja
主題Scheme Other
主題 海食崖
言語 ja
主題Scheme Other
主題 テンションクラック
言語 ja
主題Scheme Other
主題 琉球石灰岩
内容記述
内容記述タイプ Other
内容記述 科研費番号: 14580103
内容記述タイプ Other
内容記述 平成14年度~平成16年度科学研究費補助金(基盤研究(C)(2))研究成果報告書
内容記述タイプ Other
内容記述 研究概要:本研究は石灰岩が広く分布する琉球列島の島々で,石灰岩が急斜面(崖)をつくる場所,石灰岩台地の縁,石灰岩の海岸をとりあげて,石灰岩の崖・石灰岩の崖の基部にあるノッチの深さ・崖の前面にある崩落ブロックの大きさ・石灰岩の崖の陸側にあるテンションクラックの測量、および撮影年度の異なる空中写真の判読によって、石灰岩の崖の崩落後退による地形変化を定量的に明らかにし,地形変化をもたらす石灰岩の崖の崩落を板状崩落のモデルを用いて力学的に解明しようというのが目的である。沖縄島荒崎海岸,万座毛海岸,宮古島東平安名崎の海食崖,喜界島の段丘崖を研究対象として,岩石の物性に関する室内試験と現地調査を行い,以下の結論を得た. (1)琉球石灰岩の一軸圧縮強度は,調査地点とは無関係に,密度あるいは間隙率と良い相関関係がある. (2)琉球石灰岩の一軸圧縮強度は,寸法効果をもつことが判明し,寸法効果による岩盤強度を推定する式を作成した. (3)片持ちはりのモデルに岩盤強度の推定式を用いて海食崖に関する力学的安定解析を行ったが,より現地の状況に即した安定解析を行うため,海食崖に発達するテンションクラックの深さの影響を考慮した新たなモデルを作成した.このモデルによる安定解析によって,すべての海食崖の崩壊を説明できることがわかった.したがって,琉球石灰岩からなる海食崖の崩壊は,寸法効果による岩石強度とノッチの発達に伴うテンションクラックの深さによって,コントロールされうることがわかった.しかしながら,喜界島の海成段丘に発達する琉球石灰岩からなる段丘崖の崩落条件について,本研究で作成したモデルを適用したところ,うまく説明できなかった.したがって,本研究で作成されたモデルは海食崖の崩壊について有効であることが示唆される.
内容記述タイプ Other
内容記述 研究概要:Recession of coastal cliffs made of Ryukyu Limestone was studied from the dynamic viewpoint. Several rocky coasts of Okinawa-jima, Miyako-jima and Kikai-jima were selected as the investigated areas. Field measurements were carried out for the cliff height, the depth of notches, the length of fallen blocks and longitudinal wave velocity in rock mass. The cliff height, notch depth and block length range from 2-23 m, 2-9 m and 4-13 m, respectively. Physical and mechanical properties of the cliff material were measured through the laboratory tests. The rock strength drastically decreases with increasing size of specimen, i.e., Ryukyu Limestone has the scale effects in rock strength. Combining the laboratory results of strength reduction due to scale effect and the results of the longitudinal wave velocity obtained from both laboratory and field tests, an equation was derived for estimating of the rock mass strength. Cliff instability was analyzed using a beam analysis model. The stability analysis using the strength of rock mass ignoring scale effects could not well explain cliff failures. Considering tension cracks behind cliff, a new equation for stability analysis was derived. Substituting the estimated rock mass strength and unit weight of cliff material into the equation, we obtain the critical stability lines in cliff height and critical notch depth relationships. Results show that the data from the present cliff profile was plotted in the stable area, while the length and breadth of fallen blocks was plotted on the critical lines. This leads to the conclusion that the analysis of beam failure type, which takes account of the rock mass strength and tension crack, would provide a useful framework for predicting the critical notch depth of cliff made of Ryukyu Limestone.
内容記述タイプ Other
内容記述 未公開:P.71以降(抜刷論文のため)
内容記述タイプ Other
内容記述 研究報告書
出版者
言語 ja
出版者 前門晃
言語
言語 jpn
資源タイプ
資源タイプ research report
資源タイプ識別子 http://purl.org/coar/resource_type/c_18ws
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/20.500.12000/12208
識別子タイプ HDL
収録物識別子
収録物識別子タイプ NCID
収録物識別子 BA74535416
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