2000 Fiscal Year Final Research Report Summary
RESEARCH OF THE UNDERDRAIN EFFECT
| Project/Area Number |
10460106
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| Research Category |
Grant-in-Aid for Scientific Research (B).
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Irrigation, drainage and rural engineering/Rural planning
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| Research Institution | NIIGATA UNIVERSITY |
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Principal Investigator |
NAKANO Toshirou Faculty of Agriculture, NIIGATA UNIVERSITY, Associate Professor, 農学部, 助教授 (40018544)
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| Co-Investigator(Kenkyū-buntansha) |
YOSHUDA Syouji Faculty of Agriculture, NIIGATA UNIVERSITY, Professor, 農学部, 教授 (80018530)
AODA Tadao Faculty of Agriculture, NIIGATA UNIVERSITY, Assistant, 農学部, 助手 (10282998)
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| Project Period (FY) |
1998 – 2000
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| Keywords | drainage conduit / collecting channel / growth and yield point investigation / bearing value load carrying capacity / cone index / vane shear / Coulomb's failure criterion / effective stress analysis |
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| Research Abstract |
Vane test which can be measured from settlement and slip ratio is suitable for measuring bearing capacity of soil of paddy field where the plant remains of the intactness piles up deeply. In the time which cuts down the rice plant, plow layer dried. The shear resistance force of the soil increases, because the soil structure is reconstituted by fiber component in the plant remains, when it consists so. It was proven that the friction resistance component excelled for the mowing stage in the silty cohesive soil, though the shear resistance force was almost fixed. In the way which connected one of two underdrains in lateral drain, the soil water tension is largely in the drying tendency, and especially, there is largely the drying of the plowsole layer than the plow layer in the connected hot day in August. It is based on the effect of the transpiration from the rice plant, since there is the root group area in the plowsole layer.
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