Researchers Database

ONO, Kohei

    Graduate School of Science and Engineering Civil and Environmental Engineering Assistant Professor
Last Updated :2020/11/10

Researcher Information

Degree

  • Dr. Agriculture(Kobe University)

Research funding number

  • 30804166

ORCID ID

J-Global ID

Research Interests

  • 遠心模型実験   Pipeline   Liquefaction   

Research Areas

  • Environmental science/Agricultural science / Rural environmental engineering and planning
  • Social infrastructure (civil Engineering, architecture, disaster prevention) / Geotechnical engineering

Academic & Professional Experience

  • 2020/04 - Today  Ehime UniversityGraduate School of Science and Engineering特任講師
  • 2017/04 - 2020/03  Ehime UniversityGraduate School of Science and Engineering助教
  • 2015/04 - 2017/03  日本学術振興会特別研究員(DC1)

Education

  • 2015 - 2017  Kobe University  Graduate School of Agricultural Science  博士後期課程
  • 2013 - 2015  Kobe University  Graduate School of Agricultural Science  博士前期課程
  • 2009 - 2013  Kobe University  Faculty of Agriculture

Association Memberships

  • JAPAN CHAPTER OF THE INTERNATIONAL GEOSYNTHETICS SOCIETY   JAPAN SOCIETY OF CIVIL ENGINEERS   THE JAPANESE SOCIETY OF IRRIGATION, DRAINAGE AND RURAL ENGINEERING   THE JAPANESE GEOTECHNICAL SOCIETY   

Published Papers

  • Investigation of damage mechanism of large-scale landslide in Sibalaya, Palu due to the 2018 Sulawesi Earthquake
    Ono, K, Okamura, M, Mulana, A, Arsyad, A, Nurdin, S
    Proceedings of the 17th World Conference on Earthquake Engineering 2020/09 [Peer-reviewed]
     International conference proceedings
  • Okamura, M, Ono, K, Arsyad, A, Minaka, U.S, Nurdin S
    Soils and Foundations 60 (4) 1050 - 1063 0038-0806 2020/08 [Peer-reviewed]
     Scientific journal 
    © 2020 On 28th September 2018, an earthquake of Mw 7.5 hit the Central Sulawesi province in Indonesia. This was followed by liquefaction-induced large-scale ground flows in several areas in Palu city and its neighborhood. A significant characteristic of the ground flows at these sites was that large volume of soil slid downhill along gentle topographic gradients and travelled long distances (more than several hundred meters). To gain a better understanding of the fundamental mechanisms contributing to ground flows, this geo-disaster report summarizes a site investigation conducted at Sibalaya, one of the sites where massive ground flows were observed. We conducted interviews to reveal the time sequence of the event, including the main shaking that was followed by a sudden drop of the ground surface, the time at which the massive ground flow was initiated (with an extremely loud sound), as well as the change in the water level of wells. Water leakage from the unlined irrigation channel was confirmed to contribute significantly to the increase in the ground water level in this area, which thus increased the liquefaction potential. In situ tests, including eight large trench excavations and dynamic cone penetration tests, were carried out, which helped identify the liquefied and largely sheared layers. An analysis of the change in topography using satellite images and UAV photos also played an important role in capturing the overall picture of the event. Finally, a hypothesized mechanism for the extremely long slide was discussed.
  • Landslide disasters in Ehime Prefecture resulting from the July 2018 heavy rain event in Japan
    Mori, S., Ono, K.
    Soils and Foundations 59 (6) 2396 - 2409 2019/12 [Peer-reviewed]
     Scientific journal
  • Shaking table tests for buried pipe bends with thrust restraints using geogrid and gravel in liquefied ground
    Ohta, Y, Sawada, Y, Kawamura, M, Ono, K, Kawabata, T
    Proceedings of the 29th International Ocean and Polar Engineering Conference 2373 - 2377 2019/06 [Peer-reviewed]
     International conference proceedings
  • Effects of Angle and Interface Friction of Buried Pipe Bend on Lateral Resistance Force
    Kawamura, M, Sawada, Y, Ohta, Y, Ono, K, Kawabata, T
    Proceedings of the 29th International Ocean and Polar Engineering Conference 2378 - 2382 2019/06 [Peer-reviewed]
     International conference proceedings
  • Effectiveness of vertical drains to prevent occurrence of liquefaction and settlement
    Okamura, M, Utari, S.M, Ono, K
    Proceedings of 7th International conference on earthquake geotechnical engineering 477 - 490 2019/06 [Peer-reviewed]
     International conference proceedings
  • Centrifuge modeling on lateral force-displacement behavior of buried pipes in liquefied sand
    Ono, K, Okamura, M
    Proceedings of the 7th International conference on earthquake geotechnical engineering 4218 - 4225 2019/06 [Peer-reviewed]
     International conference proceedings
  • ONO Kohei, MINAKA Utari Sriwijaya, OKAMURA Mitsu
    Journal of Japan Association for Earthquake Engineering 公益社団法人 日本地震工学会 19 (6) 6_68 - 6_75 2019 [Peer-reviewed]
     Scientific journal 

    The installation of gravel drains is one of the liquefaction countermeasures that has been used extensively. However, there are not many experimental studies that verified its effectiveness in a realistic stress level, and uncertainties still remains that has not been studied sufficiently. In a present study, a series of centrifuge tests were conducted focusing on the influence of permeability of drains and liquefaction layer and the effective confining pressure on the dissipation effects of excess pore water pressure by gravel drains. The experimental results showed that the higher the permeability of the liquefaction layer, the higher the dissipation effect by gravel drains. In addition, gravel drains effectively prevented liquefaction at a greater depth as compared with at shallower depth. On the other hand, the duration of liquefaction was significantly shortened even when the permeability was low and drains could not suppress the occurrence of liquefaction.

  • 太田遥子, 澤田豊, 小野耕平, 河村未奈, 河端俊典
    ジオシンセティックス論文集 33 55‐60  1344-6193 2018/12 [Peer-reviewed]
  • 小野耕平, UTARI Sriwijaya Minaka, 岡村未対
    日本地震工学シンポジウム論文集(CD-ROM) 15th ROMBUNNO.GO12‐01‐09  2018/11 Scientific journal
  • Reduction in Liquefaction induced settlement of river levee by enhancing horizontal stress with sheet piles
    Okamura, M, Inoue, T, Jin-nouchi, N, Ono, K
    Proceedings of the 1st International Conference of Press-in Engineering 243 - 248 2018/09 [Peer-reviewed]
     International conference proceedings
  • Kohei Ono, Yu Yokota, Yutaka Sawada, Toshinori Kawabata
    International Journal of Geotechnical Engineering 12 (4) 420 - 428 1938-6362 2018/07 [Peer-reviewed]
     Scientific journal 
    The aim of the present study is to elucidate the soil–pipe interaction in saturated sand with different effective stress. A force–displacement curve that took into account the variation of the effective stress was formulated based on the results of lateral loading experiments on a model pipe. To reproduce liquefaction experimentally, the effective stress of the soil bed was controlled by the upward seepage induced by a hydraulic gradient. The model pipe was pulled laterally under either displacement or load control. The experimental results indicate that the normalised force–displacement relationships can be well approximated by hyperbolic curves under each hydraulic gradient. When the variation in effective stress is reflected in the submerged unit weight of the soil, the two coefficients of the hyperbolic curves also show a hyperbolic dependence on the unit weight, and the ultimate resistive force increases in proportion to the unit weight. The predicted force–displacement curve fits relatively well to the experimental results.
  • 堤体表面沈下分布と貫入試験によるパイピング緩み領域の把握
    岡村 未対, 今村衛, 陣内尚子, 小野耕平, 山本卓夫, 鎌田卓
    河川技術論文集 24 529 - 534 2018/06 [Peer-reviewed]
  • Model Experiments on Influence of the Bending Angles on Lateral Resistance Acting on Buried Pipe Bends
    Ohta,Y, Sawada,Y, Ono,K, Ling, H.I, Kawabata, T
    Proceedings of the 28th International Society of Offshore and Polar Engineering Conference International Society of Ocean and Polar Engineering 589 - 593 2018/06 [Peer-reviewed]
     International conference proceedings
  • Kohei Ono, Kenji Terada, Yutaka Sawada, Hoe I. Ling, Toshinori Kawabata
    Transportation Infrastructure Geotechnology 5 (2) 93 - 113 2196-7210 2018/06 [Peer-reviewed]
     Scientific journal 
    Two-dimensional simulation was carried out using a fluid coupled-DEM (discrete element method) analysis on lateral loading experiments for a pipe buried in saturated sand. The interaction between soil and pore water was reproduced by dividing the model into solid and fluid phases. The variation of the excess pore water pressure was calculated on a fluid mesh based on the pore volume change and was then given to the soil particles in the solid phase. The head difference between the fluid meshes produced upward seepage to the soil model. Liquefaction was reproduced by the decrease of the contact force between the soil particles due to the upward seepage. The force-displacement curves obtained from lateral loading simulations showed good agreement with the experimental results under various effective stress conditions. Distribution maps of contact force and displacement of soil particles revealed displacement mechanism of the buried pipe and its surrounding soil. The variation of the void ratio and the excess pore water pressure with the pipe displacement could be reproduced to some extent, and the applicability of this analysis method to interaction problems has been verified.
  • Model Experiment on Earth Pressure Acting on Buried Pipe during Sheet Pile Extraction
    Terada, K, Takahara, S, Ono, K, SAWADA YUTAKA, KAWABATA TOSHINORI
    Proceedings of the Pipelines 2017 Conference ASCE 2017/08 [Peer-reviewed]
     International conference proceedings
  • 小野耕平, 横田木綿, 井谷昌功, 澤田豊, 河端俊典
    農業農村工学会論文集 85 (1) I_29 - I_35 2017/06 [Peer-reviewed]
     Scientific journal
  • Kohei Ono, Yu Yokota, Yoko Ohta, Yutaka Sawada, Hoe I. Ling, Toshinori Kawabata
    Pipelines 2017: Planning and Design - Proceedings of Sessions of the Pipelines 2017 Conference 44 - 53 2017 [Peer-reviewed]
     International conference proceedings 
    A series of lateral loading experiments were conducted for a model pipe buried in saturated sand to obtain the relationships between the lateral resistive force and lateral displacement of the pipe. The model pipe was pulled laterally by an actuator after the effective stress of the soil bed was controlled by the upward seepage induced by a hydraulic gradient. The experimental results showed that the lateral resistive force increased non-linearly with the lateral displacement of the pipe. The relationship between the ultimate resistive force and the hydraulic gradient was linear. The force-displacement relationships were well approximated by hyperbolic curves under each hydraulic gradient. The relationships between the coefficients of the hyperbolic curve and hydraulic gradient were also approximated nonlinearly as hyperbolic curves.
  • 液状化地盤のせん断抵抗力に与えるジオグリッドの補強効果に関する埋設管の水平載荷実験
    小野耕平, 横田木綿, 澤田豊, 河端俊典
    ジオシンセティックス論文集 31 261 - 268 2016/12 [Peer-reviewed]
     Scientific journal
  • Lateral loading experiments for buried pipe in reinforced ground with geogrids under different hydraulic gradient
    Ono, K, Yokota, Y, Itani, Y, Sawada, Y, Kawabata, T
    Proceedings of 6th European Geosynthetics Congress 1322 - 1331 2016/09 [Peer-reviewed]
     International conference proceedings
  • Lateral Loading Test for Buried Pipe under Different Hydraulic Gradient
    Ono, K, Yokota, Y, Sawada, Y, Kawabata, T
    Proceedings of the 26th International Ocean and Polar Engineering Conference 664 - 669 2016/06 [Peer-reviewed]
     International conference proceedings
  • Axial Behavior of Buried Pipe in Liquefaction Ground
    Izumi, A, Ono, K, Takahara, S, Sawada, Y, Kawabata, T
    Transportation Infrastructure Geotechnology 3 (2) 60 - 73 2016/03 [Peer-reviewed]
     Scientific journal
  • K. Terada, K. Ono, S. Takahara, T. Miki, Y. Sawada, T. Kawabata
    Pipelines 2016: Out of Sight, Out of Mind, Not Out of Risk - Proceedings of the Pipelines 2016 Conference 1207 - 1217 2016 [Peer-reviewed]
     International conference proceedings 
    In Japan, a sheet-pile method is often used to install pipelines with large diameter into the ground because of narrow work sites and high groundwater levels. However, voids develop in the ground associated with the extraction of sheet-piles. Therefore, the ground around the buried pipes rapidly deforms, and the earth pressure acting on the pipes changes. In this paper, in order to investigate the mechanical behavior of the buried pipe during sheet-pile extraction, two-dimensional analyses by discrete element method were conducted. In this analysis, sheet-piles with three kinds of embedded length was installed, and flexible pipe having diameter of 1.0 m was modeled and backfilled in sand or cohesive soil. The result of the analyses indicated that the sheet-pile extraction led to the development of a loose area in the ground. The loose area resulted in settlement and deflection of the flexible pipe. Especially in the case of cohesive soil, the settlement and deflection were larger than expected.
  • S. Takahara, K. Ono, Y. Sawada, T. Kawabata
    PIPELINES 2016 1698 - 1709 2016 [Peer-reviewed]
     International conference proceedings 
    Trenchless rehabilitations have often been used for repairing aging irrigation pipes. However, in the Japanese design standard for irrigation pipes, the design of the rehabilitations is not prescribed. Many of past studies have not dealt with the mechanical behavior of rehabilitated pipes under eccentric loading, and the behavior has not been understood. In this study, for investigating the mechanical behavior of the rehabilitated pipes under eccentric loading, model experiments and FE-analyses were conducted. In the experiments, the rehabilitated pipes were modeled by placing the aluminum segments around the polyvinyl chloride (PVC) pipes, and the pipes were loaded with the air-bag. The results indicated that the only liners under eccentric loading deformed in oblique directions with the shift of the loading positions. On the other hand, the deformations of the liners with the host pipes were dependent on both the directions of loads acting on the liners and the damage states of the host pipes.
  • Centrifuge Modeling for Mechanical Behavior of Liners in Damaged Host Pipes
    Ono, K, Sonoda, Y, Sawada, Y, Ling H. I, Kawabata, T
    Transportation Infrastructure Geotechnology 2 (3) 139 - 154 2015/06 [Peer-reviewed]
     Scientific journal
  • A. Izumi, K. Ono, S. Takahara, Y. Sawada, M. Ariyoshi, Y. Mohri, T. Kawabata
    Pipelines 2015: Recent Advances in Underground Pipeline Engineering and Construction - Proceedings of the Pipelines 2015 Conference 316 - 324 2015 [Peer-reviewed]
     International conference proceedings 
    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.
  • Finite Element Analyses on Mechanical Behavior of Inner Rehabilitated Pipes Affected by Outer Aging Pipes
    Ono, K, SAWADA YUTAKA, Izumi, A, Miki, T, Sonoda, Y, INOUE KAZUYA, KAWABATA TOSHINORI, Ligh, H. I, Hinobayashi, J
    Proceedings of the 24th International Society of Offshore and Polar Engineering Conference 709 - 714 2014/06 [Peer-reviewed]
     International conference proceedings
  • 既設老朽管の損傷レベルが更生管力学挙動に与える影響
    SAWADA YUTAKA, 園田 悠介, 小野 耕平, INOUE KAZUYA, 毛利 栄征, 有吉 充, KAWABATA TOSHINORI
    農業農村工学会論文集 農業農村工学会 (291) 25 - 31 2014/06 [Peer-reviewed]
     Scientific journal
  • K. Ono, K. Inoue, Y. Sawada, A. Izumi, Y. Sonoda, T. Miki, Y. Mohri, H. I. Ling, L. Li, J. Hinobayashi, T. Kawabata
    Pipelines 2014: From Underground to the Forefront of Innovation and Sustainability - Proceedings of the Pipelines 2014 Conference 1040 - 1048 2014 [Peer-reviewed]
     International conference proceedings 
    This paper discusses an experimental study on the pipe rehabilitation method for the purpose of establishing a fundamental design standard. In this method, as the new pipe is directly inserted into the aging pipe, there are several possibilities in terms of cost reduction. It is not clear how the damaged outer pipe mechanically influences the inner pipe through interaction with the surrounding soil when an external force is applied to the ground. In this study, centrifuge model tests for the buried pipe are carried out. The test results indicated that deformation mode of the new pipe largely depends on the damage level of the outer pipe. When the damage state is not serious, the outer pipe protects the inner pipe from deforming and behaves positively. However, the outer pipe, if at ultimate limit state, has almost no influence on the mechanical behavior of the inner pipe. Additionally, the concentration of stress within the inner pipe tends to occur at the position where there is cracking of the outer pipe in a certain damaged condition. © 2014 American Society of Civil Engineers.

Conference Activities & Talks

MISC

Awards & Honors

  • 2019/12 国際ジオシンセティックス学会日本支部 JC-IGS論文奨励賞
     
    受賞者: 太田遥子;小野耕平;河村未奈
  • 2018/11 土木学会 優秀講演者賞
     
    受賞者: 小野 耕平
  • 2017/08 地盤工学会 優秀論文発表者賞
     
    受賞者: 小野 耕平

Research Grants & Projects

  • 斜面表層崩壊の発生に影響する降雨特性に関する実験的研究
    農業農村工学会:2020年度研究グループ助成
    Date (from‐to) : 2020/04 -2021/03 
    Author : 小野 耕平
  • 地下水位以浅に埋設されたパイプラインの新たな液状化被害メカニズムの解明と評価
    科学研究費補助金:若手研究
    Date (from‐to) : 2019/04 -2021/03 
    Author : 小野 耕平
  • 大規模地震動に対するグラベルドレーンによる液状化対策効果
    四国クリエイト協会:2019年度 建設事業に関する技術開発・調査研究
    Date (from‐to) : 2019/04 -2020/03 
    Author : 小野 耕平
  • 短繊維補強コンクリートのひび割れ抑制効果に関する研究
    農業農村工学会:平成30年度 研究グループ助成
    Date (from‐to) : 2018/04 -2019/03 
    Author : 鈴木麻里子
  • 液状化時における埋設管路の水平変位特性の解明ならびに限界状態設計法の提案
    科学研究費補助金:研究活動スタート支援
    Date (from‐to) : 2017/04 -2019/03 
    Author : 小野 耕平
  • 改修されたため池の動的挙動に関する研究
    農業農村工学会:平成29年度 研究グループ助成
    Date (from‐to) : 2017/04 -2018/03 
    Author : 泉 明良
  • 農業用圧力管路屈曲部の力学挙動の解明と老朽水路の長寿命化への展開
    科学研究費補助金:特別研究員奨励費
    Date (from‐to) : 2015/04 -2017/03 
    Author : 小野 耕平

愛媛大学教員活動実績

教育活動(B)

担当授業科目(B01)

  • 2019, the first semester, under graduate, 土質力学Ⅰ及び同演習
  • 2019, the first semester, under graduate, 微分方程式


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