Development of a Technology to Initiate Multiple Fractures in rock-like materials using Not-too-Fast but Not-too-Slow Loading
| Project/Area Number |
18K14165
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| Research Category |
Grant-in-Aid for Early-Career Scientists
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| Allocation Type | Multi-year Fund |
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| Review Section |
Basic Section 31020:Earth resource engineering, Energy sciences-related
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| Research Institution | Hokkaido University |
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Principal Investigator |
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| Project Period (FY) |
2018-04-01 – 2021-03-31
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| Project Status |
Completed (Fiscal Year 2020)
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| Budget Amount *help |
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2020: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2019: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2018: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
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| Keywords | 岩質材料 / マルチフラクチャ造成 / 遅すぎず速すぎない載荷 / 高度3次元複雑破砕解析法 / 圧力計測 / 破砕実験 / 遅すぎず・速すぎない載荷 / 岩石・岩盤 / 3次元複雑破砕シミュレータ / 実証破砕実験 / NRC / テルミット反応 / 爆燃 / 破砕シミュレータ / 高速破砕 / マルチフラクチャー / 爆燃現象 / 爆燃破砕シミュレータ / 石油・シェールガス採掘 |
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| Outline of Final Research Achievements |
As a the stimulation solutions for oil and gas wells, creation of multiple fractures that extend into surrounding rock is very important to improve productivity. Application of "not too slow but not too fast loading" may be considered as a useful solution. Due to the necessity of high-fidelity dynamic fracture process analysis (DFPA) to achieve in-depth investigation, a state-of-the-art 3D DFPA code which can simulate the very complex 3D fracture process due to "not too slow but not too fast loading" has been successfully developed. The thermit reaction of the non-explosive ingredients was investigated by measuring the generated pressure, and rock fracture test using this reaction was also conducted. By combining the measured pressure , rock fracture test and the DFPA code, the high-fidelity simulation technology for the target problem has been established, which was not possible before. The important outcomes in this project has been published in several high-quality journals.
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| Academic Significance and Societal Importance of the Research Achievements |
本研究の成果により，これまで不可能であった遅すぎず速すぎない動圧を用いたマルチフラクチャー造成機構を追求でき、対象岩石に対して最適な載荷特性を見いだし得る点は重要である．また，既往の思考錯誤的な方法でなく，開発した解析法・コードより最適条件を満たす破砕剤の開発のクリアな指針が得られる点も極めて重要である．さらに，本研究で開発したコードの汎用性は高く，最近期待されている石炭層におけるバイオメタンの地下鉱床開発で必要な石炭層破砕や土木工学分野における構造物の高速斫り技術や震災時の落石等の迅速な構造物解体等にも利用できると予想され，こうした観点からも本研究の工学・社会的な意義重要性があると考える。
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Report
(4 results)
Research Products
(29 results)
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[Presentation] Recent development and application of hybrid finite-discrete element simulator for rock failure process2019
Author(s)
D.Fukuda, M. Mohammadnejad, H.Liu, H. Han, J. Kodama, Y. Fujii
Organizer
Proc. of the 5th ISRM Young Scholars' Symposium on Rock Mechanics and International Symposium on Rock Engineering for Innovative Future, Dec. 1, Okinawa, Japan, 2019, Paper ID:2-3-1
Related Report
Int'l Joint Research
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[Presentation] Hybrid finite-discrete element analysis of smooth blasting in the TASQ Tunnel2019
Author(s)
H. Han, D. Fukuda, H. Liu, E.F.Salmi, E. Sellers, Andrew Chan
Organizer
Proc. of the 5th ISRM Young Scholars' Symposium on Rock Mechanics and International Symposium on Rock Engineering for Innovative Future, Dec. 1, Okinawa, Japan, 2019, Paper ID:2-3-2
Related Report
Int'l Joint Research
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