| Budget Amount *help |
¥38,090,000 (Direct Cost: ¥29,300,000、Indirect Cost: ¥8,790,000)
Fiscal Year 2018: ¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2017: ¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2016: ¥12,350,000 (Direct Cost: ¥9,500,000、Indirect Cost: ¥2,850,000)
Fiscal Year 2015: ¥15,860,000 (Direct Cost: ¥12,200,000、Indirect Cost: ¥3,660,000)
|
|---|
| Outline of Final Research Achievements |
To investigate the effect of relative humidity (hydration state) and interlayer cation on frictional strength of clay minerals, we developed the humidity control system in biaxial friction testing machine. Our experimental results show that frictional strengths of both Na- and Ca-montmorillonite decrease systematically with increasing relative humidity, and the frictional strength of Na-montmorillonite are higher than that of Ca-montmorillonite at a given relative humidity. We also calculated the potential energy roughness of mica, which depends on the normal stress and sliding direction. The inferred molecular friction quantitatively explains experimentally observed macroscopic friction of mica. These results reveal frictional strength of clay minerals sensitive to hydration state and interlayer structures, suggesting that fault strengths containing these clay minerals depend on these physical and chemical environments.
|
