| Project/Area Number |
05555136
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| Research Category |
Grant-in-Aid for Developmental Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Geotechnical engineering
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| Research Institution | Okayama University |
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Principal Investigator |
KOHNO Iichiro Okayama Univ., Faculty of Environmental Science and Technology, Professor, 環境理工学部, 教授 (00025941)
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| Co-Investigator(Kenkyū-buntansha) |
TAKESHITA Yuji Okayama Univ., Faculty of Environmental Science and Technology, Lecturer, 環境理工学部, 講師 (90188178)
NISHIGAKI Makoto Okayama Univ., Faculty of Environmental Science and Technology, Professor, 環境理工学部, 教授 (60112140)
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| Project Period (FY) |
1993 – 1994
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| Project Status |
Completed (Fiscal Year 1994)
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| Budget Amount *help |
¥5,300,000 (Direct Cost: ¥5,300,000)
Fiscal Year 1994: ¥2,300,000 (Direct Cost: ¥2,300,000)
Fiscal Year 1993: ¥3,000,000 (Direct Cost: ¥3,000,000)
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| Keywords | unsaturated soil / two phase flow / hydraulic property / ground water |
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| Research Abstract |
In vadose zone, the phase of water and air are together occupied in void pores of porous media. The two-phase flow finite element approach has been developed to solve these phenomena. In this approach, the unsaturated soil hydraulic properties of water and air are essential data to predict the seepage behavior in the vadose zone. In this paper, these conventional methods on a homogeneous sandy soil are modified and a new experimental methodology of determining unsaturated soil hydraulic properties is proposed. The main results in this research are as follows ;
1.Electric prospecting method is applied to measurement of saturated-unsaturated seepage flow.
An experimental methodology of determining the relationship between resistivity and volumetric water content is proposed. Unsteady drainage experiments were performed for fine sand in the laboratory.
2.An apparatus was constructed and test procedure were developed to measure the pressure head and volumetric water content by using pressure transducer and low-energy neutron source respectively.
Experimental test have been performed to determine the relationships between volumetric water content and air permeability, and pressure head and volumetric water content.
3.The numerical feasibility of determining soil hydraulic properties of water and air simultaneously from one-dimensional transient two-phase flow experiments in the laboratory by parameter estimation method is evaluated.
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