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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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NAKAZAWA Hiroshi, SUETSUGU Daisuke, HARA Tadashi, KURIHARA Hiroyuki, NISHI Tsuyoshi
Journal of the Society of Materials Science, Japan 73 ( 1 ) 46 - 51 2024.1
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Society of Materials Science, Japan
The advantage of gabion structures is that they are simple, cost-effective, and quick to construct, and they are used in a wide variety of applications in Japan and abroad. However, despite the fact that wire mesh comprising the gabion has been used for a long time, there are few studies on its basic mechanical properties. Therefore, the design and construction of gabion structures are mostly based on experience due to the lack of established design methods. In this study, large triaxial compression tests on the stones for filling into gabion boxes and a series of compression tests on miniature gabions were carried out in order to understand the basic mechanical properties of the structures. From the tests, the compressive properties of the miniature gabions were found to be varied depending on the difference of geometry of the stone and the combination of the shape and direction of the wire mesh. These results suggest that an understanding on deformation mechanism of gabion structures is necessary for their reasonable design and construction.
DOI： 10.2472/jsms.73.46
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EFFECT OF DIATOMACEOUS EARTH ON DESICCATION CRACKING OF EXPANSIVE SOILS Reviewed
Tadesse A.B., Fukubayshi Y., Koyama A., Suetsugu D.
International Journal of GEOMATE 24 ( 105 ) 66 - 76 2023.5
Publishing type：Research paper (scientific journal) Publisher：International Journal of GEOMATE
Expansive soils shrink and swell, causing considerable density differences as the moisture content varies and cracks develop as the soil dries. This cracking condition has a detrimental effect on the stability of infrastructure built on expansive soil, such as road embankments. This paper investigates the influence of diatomaceous earth (at 5%, 10%, 15%, and 20% DE percent by mass) on the desiccation cracking of expansive soils. The report demonstrates an image analysis technique to describe soil surface cracking quantitatively. The geometric features of cracks, such as surface crack area and crack connectivity, were estimated and examined. The study considers soil crack area ratio and cracking index to investigate the effect of diatomaceous earth on expansive soil surface cracking. The crack area ratio and cracking index analysis results show that the expansive soil surface cracking is uneven and significant. The soil matrix containing 10% and 20% diatomaceous earth has reduced surface cracking and a homogenous radial cracking pattern. The image analysis approach, an essential method to quantitatively quantify soil desiccation cracking, revealed that diatomaceous earth substantially affects surface crack reduction.
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日南層群分布域の道路斜面の動態観測と地下水位推定による地すべり挙動の検討 Reviewed
伊集院 弘尚, 福林 良典, 神山 惇, 末次 大輔
地盤工学会災害調査論文報告集 1 ( 1 ) 121 - 137 2023.4
Authorship：Last author Language：Japanese Publishing type：Research paper (scientific journal) Publisher：公益社団法人 地盤工学会
イモ洗いのニホンザルが生息する宮崎県串間市の幸島から，南へ2.0kmほど国道448号を南下した箇所で，令和2年7月豪雨により路側構造物や道路に変状をきたす道路災害が発生した。当該箇所は，平成22年（2010年）から現在に至るまで，数回にわたり被災・復旧を繰り返している箇所であり国道448号の道路管理上の要ともいえる場所である。令和2年7月豪雨においては，擁壁の増し打ちアンカーの抜け出し，擁壁の傾倒・沈下，道路のクラック等の変状が確認され，全面通行止めによる通行規制が数か月間に渡り実施された。人的被害の発生は免れたものの，地域経済や観光業，緊急輸送道路としての機能に少なからず影響を与え，地域住民の生活に大きな制限を強いたことは言うまでもない。本事例報告においては，過去に発生した被災状況及び令和2年7月豪雨で発生した被災状況を紹介しながら，地盤工学的観点から，同じ箇所で繰り返し発生する道路災害防止に関しての1つの考えを述べるものである。
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宮崎県西米良村における国道219号線での道路盛土の崩壊と復旧工 Reviewed
神山 惇, 福林 良典, 伊集院 弘尚, 末次 大輔
地盤工学会災害調査論文報告集 1 ( 1 ) 115 - 120 2023.4
Authorship：Last author Language：Japanese Publishing type：Research paper (scientific journal) Publisher：公益社団法人 地盤工学会
令和2年7月豪雨により，宮崎県西米良村にある国道219号の道路盛土が崩壊した。当該現場は令和元年台風17号においても同様な被害が生じている。本稿では，令和2年7月豪雨における当該現場での被災状況調査結果について報告するとともに，過去の豪雨による被害事例について述べる。そして，今回の被害を受け設計，施工されている復旧工の様子を示す。
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Fukubayashi Y., Koyama A., Suetsugu D.
E3S Web of Conferences 368 2023.2
Language：English Publishing type：Research paper (scientific journal) Publisher：E3S Web of Conferences
In African countries, in order to improve the trafficability of earth and gravel road, locally available material-based and labour-based approach are regarded as one of the most practical measures. As one of the approaches, a base course reinforcement method using Do-nou, which is the Japanese term for soil bag, had been developed. In this study, the bearing capacity of base course built with Do-nou has been examined through the Dynamic Cone Penetration tests (DCP). The series of full-size driving tests have been conducted with varying base structures and compaction methods. The results of the DCP tests show that, only in the case of Do-nou reinforcement base with manual compaction, the strength distribution balance at the part of base course and subgrade within 800 mm in depth from surface was shifted from average to well after being subjected to traffic load. In the other two cases, the balance remained average. It presents that by reinforcing soil material with Do-nou bags, the base course compacted manually keeps the sufficient bearing capacity and well-balanced strength profile in depth comparing with those conventionally designed and constructed with equipment.
Books 【 display / non-display 】
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末次大輔，他（ Role： Contributor , 第7章）
（公社）土木学会 2023.3 （ ISBN:9784844609186 ）
Language：Japanese Book type：Scholarly book
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安福 規之 , 石藏 良平 , 大嶺 聖, 笠間 清伸 , 酒匂 一成 , 蒋 宇静 , 末次 大輔 , 杉本 知史 , 林 泰弘 ( 工学), 福林 良典 , 松原 仁 , 椋木 俊文 , 村上 哲 , 山本 健太郎 （ Role： Contributor , 第6章，他）
理工図書 2022.9 （ ISBN:9784844609186 ）
Language：Japanese Book type：Scholarly book
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熊本地震被災構造物の復旧に関する調査研究
末次大輔，他（ Role： Contributor）
地盤工学会九州支部 2023.1
Language：Japanese Book type：Report
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Integrity and restoration of soil structures damaged by the 2016 Kumamoto earthquake
Suetsugu D., Sahara K., Konami T., Fukuda N., Hirae F.（ Role： Sole author）
Smart Geotechnics for Smart Societies 2023.1 （ ISBN:9781003299127 ）
Language：English Book type：Scholarly book
During the 2016 Kumamoto earthquake, which caused two seismic intensities of seven for two days, numerous severely damaged infrastructures were constructed in the vicinity of active faults. Most of these structures have now been reconstructed and are currently in service. In such areas, it is necessary to consider the minimization of the damage as much as possible in the event of future seismic motion or ground surface displacement. In addition, if the deformed structure can avoid collapse, it is necessary to evaluate its integrity for its use. In this study, surveys were conducted on two types of structures: a steel strip reinforced soil wall and an expanded polystyrene lightweight embankment located near active faults that was damaged during the Kumamoto earthquake. The methods were used to evaluate the integrity of the structures and the policies and methods of reconstruction.
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Koyama A., Suetsugu D., Fukubayashi Y.（ Role： Sole author）
Smart Geotechnics for Smart Societies 2023.1 （ ISBN:9781003299127 ）
Language：English Book type：Scholarly book
A method of filling the lower space of a bridge with rigid polyurethane foam (RPU foam) to reduce the traffic load along with seismic reinforcement is often applied to extend the life of bridges in Japan. The purpose of this study was to evaluate the reinforcement effect and change in the vibration characteristics of a bridge that was converted into a lightweight embankment using RPU foam filling. A truck was driven before and after filling an actual bridge with RPU foam and monitored the embankment behavior. RPU foam was observed to reduce the vibration and strain of the slab at the center of the span. The predominant frequency inside the RPU foam when a traffic load was applied was approximately 5 Hz, and long-period vibration was confirmed compared to the slab. Enclosed CPI_AR_PDF1.7.joboptions should be used to create the final camera ready copy PDF file. The publisher will reduce camera-ready copies by 75%. For the convenience of the authors, template files for MS Word 6.0 (and higher) are provided. R_PDF1.7.joboptions should be used to create the final camera ready copy PDF file. The publisher will reduce camera-ready copies by 75%. For the convenience of the authors, template files for MS Word 6.0 (and higher) are provided.
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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高炉スラグとオルトケイ酸ナトリウムによる改良土の強度及び海水環境下における劣化特性
立和名圭太，安井賢太郎，山田 宏，原 弘行，末次 大輔
令和5年度土木学会西部支部研究発表会 2024.3.8
Event date： 2023.3.8
Language：Japanese Presentation type：Oral presentation (general)
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鋼材により耐震補強された発泡ウレタン軽量盛土の地震時挙動の検討
月足天衣，神山 惇，末次大輔，福林良典，審良善和，三田部 均
令和5年度土木学会西部支部研究発表会 2024.3.8
Event date： 2023.3.8
Language：Japanese Presentation type：Oral presentation (general)
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砂岩泥岩互層斜面における崩壊危険性に関する素因分析
前田陸也，末次大輔，神山 惇，吉村辰朗，福田直三
令和5年度土木学会西部支部研究発表会 2024.3.8
Event date： 2023.3.8
Language：Japanese Presentation type：Oral presentation (general)
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ため池堤体の3次元浸透流に及ぼす谷地形の影響
西原 希，川野純也，神山 惇，末次大輔，福林良典，藤本哲生
令和5年度土木学会西部支部研究発表会 2024.3.8
Event date： 2023.3.8
Language：Japanese Presentation type：Oral presentation (general)
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貯水位上昇と降雨浸透が同時作用するため池堤体内部の3次元浸透流の検討
川野純也，神山 惇，末次大輔，福林良典，藤本哲生
令和5年度土木学会西部支部研究発表会 2024.3.8
Event date： 2023.3.8
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 - 2023.03
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。