Effect of water on the mechanism of time-dependent rock strength
Project/Area Number |
15K06221
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Research Category |
Grant-in-Aid for Scientific Research (C)
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Allocation Type | Multi-year Fund |
Section | 一般 |
Research Field |
Geotechnical engineering
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Research Institution | National Institute of Advanced Industrial Science and Technology |
Principal Investigator |
MASUDA KOJI 国立研究開発法人産業技術総合研究所, 地質調査総合センター, 副研究部門長 (30344104)
|
Project Period (FY) |
2015-10-21 – 2018-03-31
|
Project Status |
Completed (Fiscal Year 2017)
|
Budget Amount *help |
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2017: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2016: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2015: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
|
Keywords | 岩石力学 / 岩石強度 / 摩擦強度 / 応力腐食 / アスペリティ / 破壊強度 / 破壊実験 / 断層強度回復 |
Outline of Final Research Achievements |
The strengths of crustal faults are lower than those determined from laboratory measurements. Because long-term changes of rock strength cannot be directly monitored, so an explanation for fault weakening remains an unsolved problem. We showed laboratory evidence that supports the concept that long-term weakening of the rock strength is caused by microfracturing at asperity contacts, which is a result of crack growth at subcritical stress levels. We conducted a series of rock tests under the high-temperature and high-pressure conditions to accelerate reaction processes so that they were observable at laboratory time-scales. Our results suggest that long-term weakening of rock strength is related to chemical reactions that take place in the presence of water. The fluids underground has an important influence on time-dependent rock strength.
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Report
(4 results)
Research Products
(7 results)