| Budget Amount *help |
¥15,990,000 (Direct Cost: ¥12,300,000、Indirect Cost: ¥3,690,000)
Fiscal Year 2016: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2015: ¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2014: ¥7,800,000 (Direct Cost: ¥6,000,000、Indirect Cost: ¥1,800,000)
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| Outline of Final Research Achievements |
The results of laboratory tests and filed monitoring at a fill slope comprising weathered granite residual soil showed high porosity area is generated. It is considered that the most plausible reason for it may be attributed to leaching of fine particle fraction due to lateral flow. It reveals the fact that since fill slopes are constructed by using disturbed soil material, bonding strength of subsoil in fill slope is much weaker than that in natural slope and cut slope. And the leaching of fine particle fraction causes reduction in cohesion of subsoil and consequently increases landslide risk. Therefore, it is pointed out that the investigation for fill slopes comprising relatively high permeable soil requires considering degrading procedure in shear strength caused by leaching of fine particle fraction with time.
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