| Project/Area Number |
59850085
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| Research Category |
Grant-in-Aid for Developmental Scientific Research
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| Allocation Type | Single-year Grants |
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| Research Field |
基礎・土質工学
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| Research Institution | Tokyo Institute of Technology |
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Principal Investigator |
OHMACHI Tatsuo 東京工業大学, 国立大(その他), 助教授 (90126269)
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| Project Period (FY) |
1984 – 1985
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| Project Status |
Completed (Fiscal Year 1985)
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| Budget Amount *help |
¥6,300,000 (Direct Cost: ¥6,300,000)
Fiscal Year 1985: ¥1,900,000 (Direct Cost: ¥1,900,000)
Fiscal Year 1984: ¥4,400,000 (Direct Cost: ¥4,400,000)
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| Keywords | in-situ measurement / shear modulus / torsional vibration / 軟弱地盤 |
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| Research Abstract |
A simple system has newly been developed for in-situ measurement of shear modulus of soft ground surface. It utilizes a fact that a fundamental period of a single degree of freedom system is elongated when the system is situated at a soft soil surface. The system is made up of a torsional free-vibrator, piezo-electric measurement devices, a A/D converter and a hand-held computer, having total weight less than 2 kgf. The vibrator is mode of stainless steel, having the fundamental rotating period about 1/10 sec. The system takes only 5 minutes or so to indicate a single test result.
The system was applied to a sand deposit model with different compaction levels. Test results were compared with shear modulus values obtained by the plate-shooting method, demonstating its usufulness in practical use for soft soil having shear modulus about 50 - 150 kgf/sq.cm.
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