Many efforts have been done for introducing the ground friction to the design of caisson type pile foundation under condition of large-sized. Ground reinforcing type foundation which has rigid steel bars for reinforcement of the surrounding ground is very effective for increasing of friction under using contact concrete support. It has developed in order to cut down the cost of the foundation for transmission tower or road bridge foundations, these are determined by uplift or horizontal bearing capacity. In this study, the authors investigate the reinforcement effects for vertical bearing capacity of reinforced and un-reinforced foundations under consideration of experimental viewpoint. The outdoor actual size vertical loading tests show the character of friction and the mechanical effect of the reinforcement. The evaluation method which is proposed on facts of experiment and analysis is appropriately demonstrated.
{"title":"Experimental study on friction and bearing capacity of caisson type pile under considering ground reinforcement","authors":"M. Ueno, N. Nakatani","doi":"10.3208/JGS.3.213","DOIUrl":"https://doi.org/10.3208/JGS.3.213","url":null,"abstract":"Many efforts have been done for introducing the ground friction to the design of caisson type pile foundation under condition of large-sized. Ground reinforcing type foundation which has rigid steel bars for reinforcement of the surrounding ground is very effective for increasing of friction under using contact concrete support. It has developed in order to cut down the cost of the foundation for transmission tower or road bridge foundations, these are determined by uplift or horizontal bearing capacity. In this study, the authors investigate the reinforcement effects for vertical bearing capacity of reinforced and un-reinforced foundations under consideration of experimental viewpoint. The outdoor actual size vertical loading tests show the character of friction and the mechanical effect of the reinforcement. The evaluation method which is proposed on facts of experiment and analysis is appropriately demonstrated.","PeriodicalId":246019,"journal":{"name":"Jiban Kogaku Janaru (japanese Geotechnical Journal)","volume":"67 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127218832","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
H. Sano, S. Aso, M. Yamada, Tukasa Kashiwabara, Mikihito Furukawa, Keiji Sumigawa, Kohichi Sato, Takatoshi Nakamura
{"title":"Investigation of Properties of Steel Making Slag Mounds with Atmospheric Aging Process Stacked up to Stabilize Expansion in Iron Work","authors":"H. Sano, S. Aso, M. Yamada, Tukasa Kashiwabara, Mikihito Furukawa, Keiji Sumigawa, Kohichi Sato, Takatoshi Nakamura","doi":"10.3208/JGS.12.351","DOIUrl":"https://doi.org/10.3208/JGS.12.351","url":null,"abstract":"","PeriodicalId":246019,"journal":{"name":"Jiban Kogaku Janaru (japanese Geotechnical Journal)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123247279","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"A case study of a large scale soil/groundwater contamination countermeasure by the volatile organic compound","authors":"H. Suhara, Y. Arai, Kenta Nakakoshi, Motohide Akagami, H. Kuroyama","doi":"10.3208/JGS.6.317","DOIUrl":"https://doi.org/10.3208/JGS.6.317","url":null,"abstract":"近年，工場跡地等の再開発に伴う土壌汚染が社会的問題となっていることから，汚染状況の把握，健康被害防止の措置などを定めて土壌汚染対策を実施することを目的に，平成15年2月より土壌汚染対策法（平成14年法律第53号）が施行され, 平成22年4月には改正土壌汚染対策法が施行された。一方，法規制外においても，土地取引等に対し自主調査・自主対策が行なわれ，むしろこちらの方が実施は多い。本文では，このような背景の下，繊維会社工場跡地における，第一種特定有害物質である揮発性有機化合物による大規模土壌・地下水汚染に対し，オンサイトにおいて，短期間で浄化した自主対策事例を紹介する。本事例では，回転式破砕・拡散混合工法による石灰混合処理を核にした方法により，揮発性有機化合物の土壌汚染では，環境基準の77倍，地下水汚染では環境基準の4,000倍までの汚染の浄化が可能であることを確認できた。","PeriodicalId":246019,"journal":{"name":"Jiban Kogaku Janaru (japanese Geotechnical Journal)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126736700","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Cyclic lateral behavior of piles embedded in partially improved soil by iron and steelmaking slag","authors":"Yusuke Homma, K. Tominaga, O. Nagai","doi":"10.3208/JGS.1.45","DOIUrl":"https://doi.org/10.3208/JGS.1.45","url":null,"abstract":"鉄鋼スラグの新たな用途開発の一つとして、鉄鋼スラグで杭頭周辺の極浅層範囲の地盤を改良することにより杭の水平抵抗の増大を図る工法の開発が考えられ、筆者らはその研究・開発を手掛けている。本論文は、この研究の一環として実施した、杭頭周辺地盤を鉄鋼スラグで浅層改良した地盤中杭の正負交番繰り返し水平加力実験結果について報告する。具体的には、繰り返し荷重を受ける杭の水平挙動を紹介し、さらに浅層改良に用いた鉄鋼スラグの特性の違いが杭の水平抵抗に与える影響について検討を加えた結果について報告する。","PeriodicalId":246019,"journal":{"name":"Jiban Kogaku Janaru (japanese Geotechnical Journal)","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126949000","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Evaluation of deformation and strength characteristics of sandy gravel in river embankments","authors":"T. Kodaka, K. Itabashi, Kosuke Nakasima, Yukiho Makita, Kyu-Tae Lee, Toshihide Uemura, K. Tsubota, Masaya Kato","doi":"10.3208/JGS.5.193","DOIUrl":"https://doi.org/10.3208/JGS.5.193","url":null,"abstract":"大きな礫から細粒分まで含む河川堤防土について，原粒度のままの変形・強度特性を求めるには大型三軸試験を行うのが理想であるが，現実には，大きな礫を除外した粒度調整試料を用いて室内試験を実施することになる。本研究では，河川堤防で採取した礫混じり砂を用いて原粒度試料の大型三軸試験を実施することにより，供試体乾燥密度と排水条件が試験結果に及ぼす影響について検討した。さらに，粒度調整した小型三軸試験も実施し，供試体寸法の効果についても検討した。大型および小型三軸試験の結果を比較すると，同じ供試体乾燥密度であっても，供試体の寸法効果によって，小型三軸試験で得られる試験結果は密詰め傾向の変形・強度特性を示すことがわかった。また，大型三軸，小型三軸ともに，CD試験で得られるΦdとCU試験で得られるΦ’は，供試体乾燥密度が大きい場合にはほぼ同じになるものの，供試体乾燥密度が小さい場合には差が生じることが示された。さらに，礫分含有率を変えない粒度調整を行うことで，小型三軸で得られる変形・強度特性は，大型三軸の結果に近づくことも示された。","PeriodicalId":246019,"journal":{"name":"Jiban Kogaku Janaru (japanese Geotechnical Journal)","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115043004","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
S. Kano, T. Tsuchida, Shota Nakagawa, Masahiro Kaibori, S. Nakai, N. Kitayama
{"title":"Study on landslide disaster occurred at Higashihiroshima City Siwa district in 2009","authors":"S. Kano, T. Tsuchida, Shota Nakagawa, Masahiro Kaibori, S. Nakai, N. Kitayama","doi":"10.3208/JGS.6.243","DOIUrl":"https://doi.org/10.3208/JGS.6.243","url":null,"abstract":"","PeriodicalId":246019,"journal":{"name":"Jiban Kogaku Janaru (japanese Geotechnical Journal)","volume":"203 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123036535","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Study on lateral resistance and application to railway structures of batter pile foundation","authors":"S. Kiyota, T. Yonezawa, H. Aoki, M. Koda, H. Nishioka, Dewa Toshiyuki","doi":"10.3208/JGS.5.293","DOIUrl":"https://doi.org/10.3208/JGS.5.293","url":null,"abstract":"鉄道構造物で使用されるラーメン高架橋は，一般に桁式高架橋に比べて線路直角方向の水平剛性が低いことから，地震時には，ラーメン高架橋と桁式高架橋の境界での不同変位が大きくなり，列車走行安全性が問題となる場合がある。これに対し，斜杭基礎を鉄道構造物へ適用することで構造物の水平剛性が向上し，地震時の列車走行安全性を高められることが期待できるが，施工環境などの制約から近年の鉄道構造物では斜杭基礎の適用が行われていないこともあり，地震時の水平抵抗特性など未解明な点が多い。そこで，静的および動的の非線形解析と模型実験に基づき，斜杭基礎の水平抵抗特性を明らかにするとともに，鉄道構造物への適用性について検討した。本論文では，比較的小さな傾斜角度の斜杭基礎を対象に検討を行い，5度程度の小さな傾斜角度でも，鉄道構造物の地震時水平変位量を小さく抑えられることや，等価固有周期を短くできることを確認した。また，列車の走行安全性が構造物諸元の決定要因となるような場合に斜杭基礎を適用することで，耐震性のみならず経済性も向上することを確認した。","PeriodicalId":246019,"journal":{"name":"Jiban Kogaku Janaru (japanese Geotechnical Journal)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114367840","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"A method to identify deformation anisotropy of rock masses by triaxial testing","authors":"Y. Togashi, M. Kikumoto, K. Tani","doi":"10.3208/JGS.10.201","DOIUrl":"https://doi.org/10.3208/JGS.10.201","url":null,"abstract":"","PeriodicalId":246019,"journal":{"name":"Jiban Kogaku Janaru (japanese Geotechnical Journal)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122184488","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Toshihiro Ogino, Takayuki Takahashi, H. Oikawa, T. Mitachi, M. Tsushima
Shear modulus of peat soil from Akita, Japan is evaluated and discussed in this paper. Bender element and triaxial cyclic loading tests are performed on disturbed and undisturbed specimens. Three techniques for travel time determination on bender element test proposed so far are applied on each specimen to discuss the resulting error on shear modulus evaluation. Estimated G - σ relationships show that the difference of shear modulus between cyclic loading and bender element tests is practically negligible and that the value of shear modulus is approximately 25% less than those from overseas or domestic reports. It is also described that structural anisotropy of peat soil caused by the fiber orientation has little influence on shear modulus in contrast with on shear strength.
{"title":"Shear modulus of peat soil at small strain measured by laboratory bender element and cyclic loading test","authors":"Toshihiro Ogino, Takayuki Takahashi, H. Oikawa, T. Mitachi, M. Tsushima","doi":"10.3208/JGS.4.125","DOIUrl":"https://doi.org/10.3208/JGS.4.125","url":null,"abstract":"Shear modulus of peat soil from Akita, Japan is evaluated and discussed in this paper. Bender element and triaxial cyclic loading tests are performed on disturbed and undisturbed specimens. Three techniques for travel time determination on bender element test proposed so far are applied on each specimen to discuss the resulting error on shear modulus evaluation. Estimated G - σ relationships show that the difference of shear modulus between cyclic loading and bender element tests is practically negligible and that the value of shear modulus is approximately 25% less than those from overseas or domestic reports. It is also described that structural anisotropy of peat soil caused by the fiber orientation has little influence on shear modulus in contrast with on shear strength.","PeriodicalId":246019,"journal":{"name":"Jiban Kogaku Janaru (japanese Geotechnical Journal)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116597595","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
T. Hara, H. Hazarika, S. Kuroda, K. Kuribayashi, T. Nishi, Hideo Furuichi, K. Takezawa, T. Ohsumi
{"title":"Analysis of the compound disaster suffered by a river dike due to the 2011 off the pacific coast of Tohoku earthquake","authors":"T. Hara, H. Hazarika, S. Kuroda, K. Kuribayashi, T. Nishi, Hideo Furuichi, K. Takezawa, T. Ohsumi","doi":"10.3208/JGS.9.645","DOIUrl":"https://doi.org/10.3208/JGS.9.645","url":null,"abstract":"","PeriodicalId":246019,"journal":{"name":"Jiban Kogaku Janaru (japanese Geotechnical Journal)","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116723088","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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