{"_buckets": {"deposit": "c669bf3c-87fc-4b36-8afd-71ea314a5d35"}, "_deposit": {"created_by": 10, "id": "2293", "owner": "1", "owners": [10], "pid": {"revision_id": 0, "type": "depid", "value": "2293"}, "status": "published"}, "_oai": {"id": "oai:nied-repo.bosai.go.jp:00002293", "sets": []}, "author_link": [], "item_10002_biblio_info_7": {"attribute_name": "書誌情報", "attribute_value_mlt": [{"bibliographicIssueDates": {"bibliographicIssueDate": "2022-02-28", "bibliographicIssueDateType": "Issued"}, "bibliographicIssueNumber": "473", "bibliographicPageEnd": "28", "bibliographicPageStart": "1", "bibliographic_titles": [{"bibliographic_title": "防災科学技術研究所研究資料", "bibliographic_titleLang": "ja"}]}]}, "item_10002_description_5": {"attribute_name": "抄録", "attribute_value_mlt": [{"subitem_description": "660 年，朝鮮半島の百済は唐・新羅の連合軍に敗れ，当時の日本である倭に救済を求めてきた．663 年，百済を助けるため倭・百済の連合軍は，朝鮮半島南部の白村江（はくそんこう）で唐に大敗を喫した．その後，唐・新羅の連合軍が，倭に攻めてくるのではないか，という事態に備え，大宰府防衛のために，664 年に水城（みずき）が，665 年に大野城，基肄城が造られた．その100 年後，吉備真備が，天平勝宝8 年（756）大陸の技術によって築いた怡土城跡は，城址には，望楼の礎石と思われる石と土塁が約2 km尾根上にあり，また，奈良時代の鬼瓦なども発見されている．怡土城跡文化財調査報告書には，恰土城の城壁およびその基礎部の開削調査において，まさ土等を通常の方法で締め固めた場合に比較して，強度が明らかに大きな土層の存在が確認された．築城した山城の補強として，石塁背後の粘土層から「苦汁」が検出された．この苦汁は，版築の際に濃縮した海水を散布・混入した可能性があると指摘されていることから，本研究では苦汁が砂質粘土に与える力学的効果を把握するためにモデル塁の一軸圧縮試験とモデル土塁の微細構造解析と鉱物解析を実施した．その結果，にがりを添加した後に乾燥処理をすることで，間隙に土の固化を促す鉱物が析出し，土塁の強度を高める可能性を見出した．\nIn 660 A.D., Baekje was defeated by the allied forces of Tang and Silla and requested Japan (then Wa) for help. The Korean state Baekje and Wa allied forces were annihilated in Hakusukinoe on the Korean Peninsula in AD 663 in a battle with Tang China and Korean state Silla. This experience led the country to build a national defense network. In preparation for possible attack by the allied forces, Mizuki Fortress, a part of the network, was built in AD 664 and then the Ohnojyo Castle and Kiijyo Castle were built in AD 665 to protect Dazaifu. The Itojyo Castle ruin was a mountain castle built dating after around one century time. Kibino Makibi, the Dazai Daini was in charge of constructing the castle. The six remains of bourou (watchtower) are located on the hillside, and a dorui (earthworks for fortress) runs through 2km on the ridge of the mountain. Also, Gargoyle of the Nara Era in the eighth century was excavated from the remains of ruins of the Itojyo Castle. According to the Itojyo Castle cultural property investigation report, during the excavation survey of the castle walls and its foundation of the Itojyo Castle, the presence of soil layer was confirmed. This soil layer has much higher strength compared to the decomposed granite soil compacted in a normal manner. The report also cites that “bittern”, which was possibly used for soil reinforcement of the mountain castle, was detected in the clay layer behind the stone mound. Concentrated seawater may have been sprayed and mixed in the layer during the compaction construction process. We conducted an experiment on the mechanical property that bittern gives to sandy clay. The mechanical property of the bittern component in the sandy clay confirmed in the walls of the earthwork fortress and the foundations was obtained by the soil tests and observed with a scanning electron microscope. X-ray powder diffractions were clarified by the mineral composition of each specimen.", "subitem_description_language": "ja"}]}, "item_10002_description_6": {"attribute_name": "内容記述", "attribute_value_mlt": [{"subitem_description": "誤記対応の為、2022年3月31日にPDFを差し替えました。", "subitem_description_language": "ja"}]}, "item_10002_identifier_registration": {"attribute_name": "ID登録", "attribute_value_mlt": [{"subitem_identifier_reg_text": "10.24732/NIED.00003450", "subitem_identifier_reg_type": "JaLC"}]}, "item_10002_publisher_8": {"attribute_name": "出版者", "attribute_value_mlt": [{"subitem_publisher": "防災科学技術研究所", "subitem_publisher_language": "ja"}]}, "item_10002_source_id_9": {"attribute_name": "ISSN", "attribute_value_mlt": [{"subitem_source_identifier": "1347-748X", "subitem_source_identifier_type": "EISSN"}]}, "item_creator": {"attribute_name": "著者", "attribute_type": "creator", "attribute_value_mlt": [{"creatorNames": [{"creatorName": "大角 恒雄", "creatorNameLang": "ja"}, {"creatorName": "オオスミ ツネオ", "creatorNameLang": "ja-Kana"}], "familyNames": [{"familyName": "大角", "familyNameLang": "ja"}, {"familyName": "オオスミ", "familyNameLang": "ja-Kana"}], "givenNames": [{"givenName": "恒雄", "givenNameLang": "ja"}, {"givenName": "ツネオ", "givenNameLang": "ja-Kana"}]}, {"creatorNames": [{"creatorName": "水井 良暢", "creatorNameLang": "ja"}, {"creatorName": "ミズイ ヨシノブ", "creatorNameLang": "ja-Kana"}], "familyNames": [{"familyName": "水井", "familyNameLang": "ja"}, {"familyName": "ミズイ", "familyNameLang": "ja-Kana"}], "givenNames": [{"givenName": "良暢", "givenNameLang": "ja"}, {"givenName": "ヨシノブ", "givenNameLang": "ja-Kana"}]}, {"creatorNames": [{"creatorName": "松原 仁", "creatorNameLang": "ja"}, {"creatorName": "マツバラ ヒトシ", "creatorNameLang": "ja-Kana"}], "familyNames": [{"familyName": "松原", "familyNameLang": "ja"}, {"familyName": "マツバラ", "familyNameLang": "ja-Kana"}], "givenNames": [{"givenName": "仁", "givenNameLang": "ja"}, {"givenName": "ヒトシ", "givenNameLang": "ja-Kana"}]}]}, "item_files": {"attribute_name": "ファイル情報", "attribute_type": "file", "attribute_value_mlt": [{"accessrole": "open_access", "download_preview_message": "", "file_order": 0, "filename": "3450_22_1.pdf", "format": "application/pdf", "future_date_message": "", "is_thumbnail": false, "mimetype": "application/pdf", "size": 0, "url": {"label": "n473.pdf", "url": "https://nied-repo.bosai.go.jp/record/2293/files/3450_22_1.pdf"}, "version_id": "dd4ec943-808c-4da1-a360-f08077d43eb2"}]}, "item_keyword": {"attribute_name": "キーワード", "attribute_value_mlt": [{"subitem_subject": "水城,怡土城,砂質粘土,苦汁,電子顕微鏡", "subitem_subject_language": "ja"}, {"subitem_subject": "Mizuki Fortress,Itojyo,Sandy clay,Bittern,Scanning electron microscope", "subitem_subject_language": "en"}]}, "item_language": {"attribute_name": "言語", "attribute_value_mlt": [{"subitem_language": "jpn"}]}, "item_resource_type": {"attribute_name": "資源タイプ", "attribute_value_mlt": [{"resourcetype": "departmental bulletin paper", "resourceuri": "http://purl.org/coar/resource_type/c_6501"}]}, "item_title": "大宰府を守る水城による防衛線と筑前怡土城の土塁補強工法に関する研究", "item_titles": {"attribute_name": "タイトル", "attribute_value_mlt": [{"subitem_title": "大宰府を守る水城による防衛線と筑前怡土城の土塁補強工法に関する研究", "subitem_title_language": "ja"}, {"subitem_title": "Research on Earthwork Reinforcement Method of Dazaifu\u0027s Defense Layout with the \\nMizuki Fortress and the Chikuzen Itojyo Castle", "subitem_title_language": "en"}]}, "item_type_id": "10002", "owner": "10", "path": ["1002"], "permalink_uri": "https://doi.org/10.24732/NIED.00003450", "pubdate": {"attribute_name": "PubDate", "attribute_value": "2022-03-01"}, "publish_date": "2022-03-01", "publish_status": "0", "recid": "2293", "relation": {}, "relation_version_is_last": true, "title": ["大宰府を守る水城による防衛線と筑前怡土城の土塁補強工法に関する研究"], "weko_shared_id": -1}