本研究では, 厚生労働省が2013年にとりまとめた東日本大震災水道施設被害状況調査最終報告書で用いられた導水管, 送水管, 配水管の被害データと筆者らによる液状化発生データを用いて, 管路被害における液状化発生の影響を分析した．分析の結果, 上記の管路被害のうち口径50mmを越える被害の約25%, 口径50mmの管路被害の約15%は液状化が確認された250mメッシュの中にあった．関東地方と東北地方を比べると, 関東地方の方が液状化メッシュ内での管路被害の割合が多かった．管路への液状化の影響は震度5強以上, PGA?150cm/s2, PGV?20cm/sで起きており, 震度とPGAに関しては, 地震動指標値が低くなるほど, 液状化発生メッシュ内での被害地点の占める割合が多くなる傾向が認められた．液状化メッシュ内とそれ以外の被害地点の微地形区分を比べると, 両者には明瞭な差異があり, 前者はいわゆる液状化が起きやすい微地形区分, 後者は丘陵や台地など比較的硬い地盤で構成される微地形区分が多かった．液状化発生メッシュ内での管路被害地点は, 宅地になる以前の旧地形の影響を強く受けている地域が目立った．液状化発生メッシュ内での管路の被害割合が多かった事業体における液状化発生地点を対象として, 「宅地の液状化可能性判定に係る技術指針」に示された二次判定手法により液状化被害の可能性の判定を行ったところ, 解析を行った6地点全てで「顕著な被害の可能性が高い」と判定された．
","subitem_description_language":"ja","subitem_description_type":"Other"},{"subitem_description":"The damage caused by the 2011 Tohoku earthquake (Mw = 9.0) to water transmission and distribution pipelines in Japan is investigated using the database on pipeline repairs provided by the Ministry of Health, Labour and Welfare. The numbers of repair are summarized according to areas of water supply corporations and the presence or absence of liquefaction during the Tohoku earthquake. The locations of the pipeline repairs are discussed with respect to the earthquake intensity and geomorphologic conditions. The following findings were obtained: (1) Approximately 25% of the pipeline repairs, with a pipe diameter of more than 50 mm, occurred at liquefied areas and in the pipelines installed in the liquefiable geomorphological units, such as artificial fills. However, 75 % of the repairs occurred outside the liquefied areas and in the pipelines installed in the unliquefiable higher lands, such as the hill and terrace areas comprising hard soils; (2) There was a distinct difference between the Tohoku and Kanto regions in terms of the numbers of repair in the liquefied areas, and the pipelines in the Kanto region were strongly influenced by liquefaction; (3) The number of repairs were counted according to the earthquake intensity and depending on the presence or absence of liquefaction. Pipe repairs were required in the areas where the IJMA exceeded 5-upper, the PGAs exceeded 150 cm/s2, or where the PGVs exceeded 20 cm/s in the liquefied areas; (4) However, the weaker the earthquake intensity, the greater will be the numbers of repair in the liquefied areas. This implies that the pipelines were damaged not by the shaking of the ground, but by the liquefaction that occurred in the areas where the earthquake intensity was not very strong; (5) Counting the numbers of repair with respect to the pipe material and coupling in the area where severe liquefaction occurred, no tendency was found to indicate that the specific material or coupling was selectively damaged; (6) The damage ratio relative to the pipe materials varied considerably according to the area of the water-supply corporation where severe liquefaction occurred; (7) The likelihood of liquefaction-induced damage was evaluated at 6 sites in the liquefied area where many pipeline repairs occurred based on the combination of liquefaction potential index PL and thickness of surface un-liquefiable layer, H1 overlying liquefiable layers, which were determined from the result of the FL analysis. From the result of the analysis, it was found that all of the sites were evaluated as \"the highest likelihood of liquefaction-induced damage\".
","subitem_description_language":"en","subitem_description_type":"Other"}]},"item_10001_publisher_8":{"attribute_name":"出版者","attribute_value_mlt":[{"subitem_publisher":"公益社団法人 日本地震工学会","subitem_publisher_language":"ja"},{"subitem_publisher":"JAPAN ASSOCIATION FOR EARTHQUAKE ENGINEERING","subitem_publisher_language":"en"}]},"item_10001_relation_14":{"attribute_name":"DOI","attribute_value_mlt":[{"subitem_relation_type_id":{"subitem_relation_type_id_text":"10.5610/jaee.17.2_142"}}]},"item_10001_source_id_9":{"attribute_name":"ISSN","attribute_value_mlt":[{"subitem_source_identifier":"1884-6246","subitem_source_identifier_type":"ISSN"}]},"item_creator":{"attribute_name":"著者","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"若松加寿江","creatorNameLang":"ja"},{"creatorName":"若松加寿江","creatorNameLang":"en"}]},{"creatorNames":[{"creatorName":"先名重樹","creatorNameLang":"ja"},{"creatorName":"先名重樹","creatorNameLang":"en"}]},{"creatorNames":[{"creatorName":"小澤京子","creatorNameLang":"ja"},{"creatorName":"小澤京子","creatorNameLang":"en"}]}]},"item_language":{"attribute_name":"言語","attribute_value_mlt":[{"subitem_language":"jpn"}]},"item_title":"東北地方太平洋沖地震による上水道管路被害における液状化の影響","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"東北地方太平洋沖地震による上水道管路被害における液状化の影響","subitem_title_language":"ja"},{"subitem_title":"Effect of Liquefaction on Damage to Water-supply Pipelines during the 2011 Tohoku Earthquake","subitem_title_language":"en"}]},"item_type_id":"40001","owner":"1","path":["1670839190650"],"pubdate":{"attribute_name":"PubDate","attribute_value":"2023-03-30"},"publish_date":"2023-03-30","publish_status":"0","recid":"5958","relation_version_is_last":true,"title":["東北地方太平洋沖地震による上水道管路被害における液状化の影響"],"weko_creator_id":"1","weko_shared_id":-1},"updated":"2023-06-08T09:33:27.026714+00:00"}