2005 Fiscal Year Final Research Report Summary
Basic study on the seepage control work of the waste landfill site by sheet piles for prevention of water pollution
| Project/Area Number |
15560429
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Geotechnical engineering
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| Research Institution | Kyushu Institute of Technology |
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Principal Investigator |
HIRO-OKA Akihiko KYUSHU INSTITUTE OF TECHNOLOGY, FUCULTY OF ENGINEERING, ASSOCIATE PROFESSOR, 工学部, 助教授 (70238400)
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| Co-Investigator(Kenkyū-buntansha) |
NAGASE Hideo KYUSHU INSTITUTE OF TECHNOLOGY, FUCULTY OF ENGINEERING, PROFESSOR, 工学部, 教授 (80180488)
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| Project Period (FY) |
2003 – 2005
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| Keywords | centrifuge / restraint of diffusion of contaminant / seepage control work / sheet pile / advection-diffusion problem / death of penetration / clay ground |
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| Research Abstract |
In this study we have carried out a series of centrifuge model tests to investigate the influence of the penetration depth of a steel sheet pile and the difference of water level between inside and outside the sheet pile on the performance in diffusion control of contaminant when a sheet pile wall penetrated into the low permeability soil layer on the high permeability soil layer. We also carried out convective hydraulic dispersion analysis based on GMS under the same condition with centrifuge model tests to compare the results of experiments and calculations. The conclusions derived from this study are below.
1)The increment of time for reaching the concentration ratio of contaminant C/CO at the clay layer surface outside the sheet pile to the specified value to the increment of penetration depth of a sheet pile depends on the conditions of the soil layers. Design by existing simplified method gives both conservative and unsafe evaluations on the time for reaching varying with the specified C/CO value.
2)The more penetration depth of a sheet pile, the higher performance in diffusion control of the contaminant we get. However, the performance in diffusion control of the contaminant becomes low when the sheet piles were penetrated to the depth near a high permeability soil layer which exists under a low permeability soil layer.
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