| Budget Amount *help |
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2020: ¥130,000 (Direct Cost: ¥100,000、Indirect Cost: ¥30,000)
Fiscal Year 2019: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2018: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
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| Outline of Final Research Achievements |
For the purpose of developing technology for practical application of volume reduction of dredging degree deposited in water, using a newly prototyped ultrasonic irradiation device and practical size test container, fine particle size (silica stone powder, Clarified the volume reduction characteristics of silica sand). In the experiment, ultrasonic waves were radiated from the horizontal direction to the fine-grained soil put into water, the frequency was 30 to 40kH, the irradiation time was 15 to 30minutes, and the wetdensity ,water content ratio, dry density, gap ratio after the test, The relative density and volume reduction rate were calculated. As a result, the output voltage became maximum at a frequency of 30kHz and an irradiation time of about 30 minutes, the relative density was 90%, and the volume reduction rate was 34%, which was a good result for the plactical application of the volume reduction technol-ogy for underwater sediment dredged soil.
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