Akira Izumi
Kobe University
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Publication
Featured researches published by Akira Izumi.
Pipelines 2015 | 2015
Akira Izumi; Kohei Ono; S. Takahara; Yutaka Sawada; Mitsuru Ariyoshi; Yoshiyuki Mohri; Toshinori Kawabata
In Japan, the main irrigation pipeline network is increasingly getting older and losing its function due to deterioration. The concept of in-situ rehabilitation for aging pipelines, which can improve the performance of a damaged pipe by installing new pipeline inside of the existing aging pipeline, has gained increasing attention. However, the seismic mechanical behavior of pipeline rehabilitated by this method is not substantially clear. In this study, to clarify the effect of damaged outer pipe on the inner pipe, shaking table tests were conducted for the buried pipe in liquefied ground. To model the inner pipe, polyvinyl-chloride (PVC) and polyethylene (PE) pipe were used. To model the outer aging pipe, different types of concrete pipes in length were used. The test results indicated that the amplitude of the bending strain in PVC pipe sharply increased due to the stress concentration at the gap between outer pipes. Additionally, the deflection mode of the pipe was categorized into two main types; bow-shaped deformation and pendulum-shaped deformation.
Jioshinsetikkusu Rombunshu (geosynthetics Engineering Journal) | 2009
Toshinori Kawabata; Takafumi Hanazawa; Yoshiyuki Mohri; Akira Izumi; Ayumu Kashiwagi
農業用パイプライン等の圧力管曲部には,その曲角度と内圧の大きさに応じてスラスト力が発生する.現行の設計基準では,大きなスラスト力が発生する場合,曲管部にコンクリートブロックを設けることでスラスト力を支持するが,コンクリートブロックは重量構造物であるため,地震時の位相差による継手離脱などの被災原因にもなっている.筆者らはスラスト力の対策工法として,ジオグリッドを用いた軽量なスラスト防護工法を提案し,検討を進めている.本研究では,スラスト防護工法として流動化処理土を用いる際の各種補強材の効果について,曲げ試験を行い,さらにPIV(Particle Image Velocimetry:粒子画像流速測定法)による画像解析を行うことにより検討を加えた.
Jioshinsetikkusu Rombunshu (geosynthetics Engineering Journal) | 2009
Toshinori Kawabata; Yutaka Sawada; Akira Izumi; Ayumu Kashiwagi; Takafumi Hanazawa
筆者らは,圧力管曲部に作用するスラスト力の対策工法として,ジオグリッドを用いた軽量なスラスト防護工法を提案し,これまでに模型実験,数値解析,大規模模型埋設実験験ならびに振動台実験などによって当提案工法がスラスト対策工法として有効であり,耐震性に優れていることを明らかにしてきた.本研究では,サイホン部緊急布設替えの施工に際して,当提案工法を採用し,管内水圧,周辺地盤の土圧,ジオグリッドの発生ひずみを計測した.計測結果から,現場においても当提案工法の有効性が実証された.
Transportation Infrastructure Geotechnology | 2018
Mitsuru Ariyoshi; Yoshikazu Tanaka; Akira Izumi; Toshinori Kawabata
Transportation Infrastructure Geotechnology | 2016
Akira Izumi; Kohei Ono; Syo Takahara; Yutaka Sawada; Toshinori Kawabata
Journal of Japan Society of Civil Engineers | 2015
Akira Izumi; Yutaka Sawada; Taiki Miki; Toshinori Kawabata
The Twenty-fourth International Ocean and Polar Engineering Conference | 2014
Kohei Ono; Yutaka Sawada; Akira Izumi; Taiki Miki; Yusuke Sonoda; Kazuya Inoue; Toshinori Kawabata; Hoe I. Ling; Liming Li; Johji Hinobayashi
The Twentieth International Offshore and Polar Engineering Conference | 2010
Toshinori Kawabata; Akira Izumi; Takafumi Hanazawa; Yoshiyuki Mohri; Ariyoshi Ariyoshi; Hoe I. Ling
The Nineteenth International Offshore and Polar Engineering Conference | 2009
Toshinori Kawabata; Takafumi Hanazawa; Ayumu Kashiwagi; Akira Izumi; Motohiro Kanda; Yoshiyuki Mohri; Kazunobu Shimura
The Nineteenth International Offshore and Polar Engineering Conference | 2009
Akira Izumi; Toshinori Kawabata; Takafumi Hanazawa; Yutaka Sawada; Ayumu Kashiwagi; Kazunori Uchida; Ayumi Shigenaka; Ippei Banno