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Affiliation |
Engineering educational research section Department of Civil and Environmental Engineerring Program |
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Professor |
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SUETSUGU Daisuke
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Degree 【 display / non-display 】
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Doctor of Engineering ( 2004.6 Kyushu University )
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Master of Engineering ( 1997.3 Kyushu University )
Research Areas 【 display / non-display 】
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Social Infrastructure (Civil Engineering, Architecture, Disaster Prevention) / Geotechnical engineering
Papers 【 display / non-display 】
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粘性土中に打設される木杭の鉛直支持力に及ぼす杭形状の影響 Reviewed
末次 大輔, 那須 龍斗, 神山 惇, 福林 良典
土木学会論文集E2（材料・コンクリート構造） 77 ( 5 ) I_77 - I_83 2022.3
Authorship：Lead author, Corresponding author Language：Japanese Publishing type：Research paper (scientific journal)
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Performance of labor-intensive base course for gravel roads with application of Do-nou Reviewed
Fukubayashi Y., Koyama A., Suetsugu D.
Transportation Engineering 7 2022.3
Language：English Publishing type：Research paper (scientific journal) Publisher：Transportation Engineering
Community participation in road construction and repair is necessary in improving rural roads in developing countries, more than 50% of which are in poor condition caused by less involvement by the government due to budget constraints. To promote community participation, constructing base course with do-nou, the Japanese term for soil bag, which does not require the use of compaction equipment, has been proposed as a practical method. To extend the application of this method, the method must be adopted by stakeholders and its performance must be clearly understood. In this study, to compare the performance of the base course constructed with do-nou with that of the conventional structures constructed with equipment based on the existing manual for low-volume roads, a series of full-size model driving tests were conducted. Silty sand with gravel was selected as the base course material that is locally available and can be practically used in rural areas of developing countries. The deformation of the base course reinforced with do-nou under traffic loading was 14.0%. By contrast, the deformation for the base course compacted with equipment was 4.9% and that for the base course compacted manually without reinforcement with do-nou was 20.9%. The results of a dynamic cone penetration survey revealed that encapsulating the base course material in do-nou bags efficiently converted the traffic load into compaction energy and thus developed a balanced strength profile. Base course reinforced with do-nou behaved as an aggregate of distinct elements of do-nou and transferred a smaller load to the subgrade when subjected to traffic loading compared with nonreinforced base courses compacted manually and with equipment. The base course with do-nou and manual compaction did not perform as well as the base course compacted with equipment; however, it demonstrated intermediate performance with surface settlement of less than the maximum allowable level of 50.8 mm. The thickness of the base course reinforced with do-nou can be determined according to the existing design manual. The degree of compaction of base course constructed labor-intensively is initially insufficient. Therefore, once the road is opened to traffic, traffic should pass over the entire width of the road in dry conditions to accelerate compaction and improve road performance.
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Koyama A., Suetsugu D., Fukubayashi Y., Mitabe H.
Construction and Building Materials 321 2022.2
Language：English Publishing type：Research paper (scientific journal) Publisher：Construction and Building Materials
Frequent major earthquakes in Japan necessitate earthquake-resistant infrastructure. The dynamic deformation characteristics of rigid polyurethane foam, used as a lightweight embankment material, is examined in this study. The effect of the initial static stress on the shear modulus of single-layer samples was small, while the shear modulus of two-layer samples increased with increasing initial static stress. The damping ratio of single-layer samples converged to 4–5%, but decreased with increasing initial static stress up to 30 kPa in two-layer samples before increasing above 40 kPa. Results from cyclic uniaxial and triaxial tests were compared. The dynamic properties depended on restriction conditions and the deformation direction.
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Nakazawa H., Ishizawa T., Danjo T., Onoue Y., Suetsugu D., Hara T.
Lecture Notes in Civil Engineering 209 LNCE 56 - 67 2022
Language：English Publishing type：Research paper (scientific journal) Publisher：Lecture Notes in Civil Engineering
In this study, based on the damage survey in Nepal, shake table tests and rainfall experiments using a typical gabion retaining wall model were conducted to investigate the influence on earthquake and rainfall basically. In a series of experiments, two same models with retaining wall with slope ground same as typical gabion retaining wall in Nepal were constructed in rigid soil container. Then, the model experiments containing shake table test after preceding rainfall and rainfall after preceding shake table test were simultaneously performed in order to confirm difference of the damage aspects caused by pattern of earthquake and rainfall. As main results, it was confirmed that the deformation tendency of the gabion retaining wall was different by the order of rainfall and earthquake. Especially, the deformation of the retaining wall in Case of preceding shake table test was minor compared to preceding rainfall. Regardless of the order by rainfall and earthquake, the gabion retaining wall showed the same tendency on deformation mode.
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Deformation Resistance of the Gabion Retaining Wall Under Horizontal Loading Reviewed
Suetsugu D., Nakazawa H., Hara T., Fukubayashi Y., Koyama A.
Lecture Notes in Civil Engineering 209 LNCE 999 - 1007 2022
Authorship：Lead author, Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：Lecture Notes in Civil Engineering
This research investigated the effects of the connecting gabions, the packing density and the particle shape of the filling gravel, and the vertical pressure on the horizontal deformation resistance of the gabion retaining wall. The dimensions of the model gabion used in this experiment were 20 cm × 20 cm × 20 cm. The model gabion retaining wall was prepared by stacking three of them vertically. The horizontal loading tests were performed with a plane strain, in which a gabion in the middle of the retaining wall was pushed horizontally while applying constant vertical load. The obtained main findings are as follows. 1) The connecting gabions have the effect of increasing the deformation resistance due to the generation of tension in the gabion net due to the deformation of itself. 2) The particle shape of the filling gravel affects the deformation resistance of the gabion retaining wall. That is, the rigidity of the gabion retaining wall using the round gravel at a small deformation level was stiffer than in the case using the angular gravel. 3) The vertical stress acting on the gabion retaining wall has little influence on its deformation resistance.
Books 【 display / non-display 】
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Evaluation of the Performance of Gravel Road with Base Course Reinforced with Do-Nou
Fukubayashi Y., Sato S., Koyama A., Suetsugu D.（ Role： Sole author）
Sustainable Civil Infrastructures 2021
Language：Japanese Book type：Scholarly book
In developing countries, improvement of trafficability of rural roads, which are generally earth or graveled, are crucial for rural development. Under the circumstances with financial constraints of those countries, locally available material-based approach towards improvement of trafficability are regarded as one of the practical measures. Do-nou, which is Japanese term for soilbag, have been utilized for reinforcing base course. Do-nou method is requiring only labor even for compaction of base material and used polyester fiber woven bags for crops, fertilizer, etc. as one of geotextile. In 29 countries of Asia, Africa and the Pacific, about 180 km rural road has been improved using the Do-nou method, by the NGO which one of the authors is belong to. Because of the easiness and effectiveness of Do-nou method, it enables minor and small enterprises, generally operated by the youth, to be involved in road construction implemented by public works. In order to improve trafficability of rural roads while solving social problem, high unemployment rate among the youth in developing countries, the method needs to be adopted by road authorities for further extension. In this study, therefore, the performance of gravel road with base course consist of Do-nou have been evaluated through the series of full-size driving tests. The settlement of road surfaces with conventionally designed base course and with that consist of Do-nou with the same thickness subjected to the traffic load were measured and compared. Dynamic cone penetration index of these base course structure was also compared. Load distribution effects were also examined using earth pressure gages located on subgrade and road surface during driving tests. The mechanism of reducing settlement of road surface with Do-nou base course were verified. The performance of base course with Do-nou are defined in comparison to conventional base course structure, which enable road authorities adopt Do-nou method.
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熊本地震による地盤構造物の被害分析および復旧に関する調査研究
末次大輔（ Role： Sole author）
(公社）地盤工学会九州支部 2020.1
Total pages：253 Responsible for pages：1-3 Language：Japanese Book type：Report
MISC 【 display / non-display 】
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塩水浸透劣化に伴うセメント処理土の強度特性の変化
井上徹郎、末次大輔
第54回地盤工学研究発表会講演概要集 581 - 582 2020.7
Language：Japanese Publishing type：Article, review, commentary, editorial, etc. (scientific journal) Publisher：(公社）地盤工学会
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ネパール国における蛇籠擁壁の健全性評価
原忠，柴原隆，西剛整，中澤博志，木村瞬，末次大輔，下村昭司，西村義幸
第54回地盤工学研究発表会講演概要集 1583 - 1584 2020.7
Language：Japanese Publishing type：Article, review, commentary, editorial, etc. (scientific journal) Publisher：(公社）地盤工学会
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令和元年8月豪雨により決壊した佐賀県小城市のため池被災調査報告
工藤啓幹，神山惇，末次大輔，藤本哲生
令和元年度土木学会西部支部研究発表会講演概要集 331 - 332 2020.3
Language：Japanese Publishing type：Article, review, commentary, editorial, etc. (scientific journal) Publisher：(公社）土木学会西部支部
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熊本地震による土構造物の被災状況と被害軽減への課題
末次大輔
2020 全建宮崎 ( 55 ) 5 - 8 2020.3
Language：Japanese Publishing type：Article, review, commentary, editorial, etc. (other) Publisher：宮崎県建設技術協会
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蛇籠金網の引張強度特性に関する基礎的検討
中澤博志，栗原裕之，中村有志，末次大輔，原忠
第74回年次学術講演会講演概要集 III-487 2019.9
Language：Japanese Publishing type：Article, review, commentary, editorial, etc. (scientific journal) Publisher：(公社）土木学会
Presentations 【 display / non-display 】
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谷地形を有する模型ため池堤体の降雨浸透実験
神山 惇 ・ 末次 大輔 ・ 福林 良典 ・ 田中 健介 ・ 藤本 哲生
令和3年度土木学会西部支部研究発表会 2022.3.5
Event date： 2022.3.5
Language：Japanese Presentation type：Oral presentation (general)
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軟弱粘土地盤に打設される木杭の鉛直支持力に及ぼす杭形状の影響
那須龍斗、末次大輔、神山惇、福林良典
第20回木材工学研究発表会 2021.9.30
Event date： 2021.9.29 - 2021.9.30
Language：Japanese Presentation type：Oral presentation (general)
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海水に接触するセメント処理土のカルシウム溶出予測の検討
皿良和樹、末次大輔、神山惇、福林良典
第56回地盤工学研究発表会 2021.7.16
Event date： 2021.7.14 - 2021.7.16
Language：Japanese Presentation type：Oral presentation (general)
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粘土地盤に打設された丸太杭の鉛直支持力に及ぼす杭形状の影響
那須龍斗、末次大輔、神山惇、福林良典
第56回地盤工学研究発表会 2021.7.16
Event date： 2021.7.14 - 2021.7.16
Language：Japanese Presentation type：Oral presentation (general)
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実物大走行実験による細粒分まじり礫質砂を中詰材とする土のう路盤の性能評価
佐藤聡平、福林良典、神山惇、末次大輔
第56回地盤工学研究発表会 2021.7.16
Event date： 2021.7.14 - 2021.7.16
Language：Japanese Presentation type：Oral presentation (general)
Grant-in-Aid for Scientific Research 【 display / non-display 】
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沿岸部軟弱地盤地帯におけるセメント混合処理地盤の健全度評価手法の開発
Grant number：21K04258 2021.04 - 2024.03
独立行政法人日本学術振興会 科学研究費補助金 基盤研究(C)
Authorship：Principal investigator
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沿岸部軟弱粘土地盤地帯における深層混合処理地盤の長期耐久性の解明
Grant number：18K04348 2018.04 - 2021.03
科学研究費補助金 基盤研究(C)
Authorship：Principal investigator
セメントならびに石灰処理土はカルシウムの溶脱に伴い徐々に軟弱化する。軟弱化の速さは地下水中（海水中）のマグネシウム濃度に依存する。沿岸部の軟弱粘土地盤地帯で施工された既設のセメント処理地盤の長期的な安定性の評価方法は確立されておらず，軟弱化による力学的不安定化メカニズムの解明が必要である。本研究では，セメント混合処理土と周辺地盤との相互作用に着目することにより，処理土-粘土間の海水の浸透特性ならびに処理土-粘土間の軟弱化に伴う力学的相互作用の変化を明らかにする。