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1994 Fiscal Year Final Research Report Summary

Application of Soft-X ray to Analyze the Micro-Struture of Flow in Porous Media

Research Project

Project/Area Number 04555123
Research Category

Grant-in-Aid for Developmental Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field Hydraulic engineering
Research InstitutionHokkaido University

Principal Investigator

FUJITA Mutsuhiro  Hokkaido Univ., Fac.of Eng., Professor, 工学部, 教授 (80001139)

Co-Investigator(Kenkyū-buntansha) NAKAO Takashi  Kitami Institute of Technology, Assistant Professor, 工学部, 助教授 (60101523)
SHIMIZU Yasuyuki  Hokkaido Univ., Fac.of Eng., Assistant Professor, 工学部, 助教授 (20261331)
TOMA Aatoshi  Muroran Institute of Technology, Assistant Professor, 建設システム・工学科, 助教授 (00002915)
Project Period (FY) 1992 – 1994
KeywordsUnsaturated Flow / Void Model in Soil / Particle Model in Soil / Seige Distribution / Detained Water around Particles / Cracks in Rock / Seepage Water in Rock / Solvent Dispersion
Research Abstract

The flow of liquid in saturated soil is described by the well-known Darcy's Low. On the other hand, the unsaturated water flow is calculated by using unsaturated hydraulic conductivity (KAPPA), which is a function of the suction (PSI) or water content (rheta). This calculations of unsaturated flow make use of this function in practice. Assuming that the soil is composed of spherical particles with various grain sizes, it is possible to analyze the water retention volume between two particles from a microscopic standpoint and to obtain the theoretical relationship between PSI and rheta. Because most sand particles in nature are inclined to have high sphericity, it is reasonable to consider them as spherical.
Generally, the water retained in soil is grouped into two categories. One is very thin film water on a particle, and the other one is pendular water between two particles. It we focus our consideration on the particles larger than 10^<-3> mm in diameter, the water retention volume in … More the pores can be regarded as free water on a particle, and to ignore the film water. Free water produces a pendular ring between two particles under unsaturated conditions because of the surface tension acting on the free water.
In this study, a new conceptual model from a microscopic to analyze the relationship between suction and water retention volume in unsaturated material composed if particles with different sizes is proposed. Furthermore, the proposed model has been used to estimate the relationship between PSI and rheta for the assumed identical regular packing. The results are summarized as followings.
(1) If adjacent particles contact strictly with each other, suction radically decreases with an increase of the water retention volume.
(2) For the same water retention volume, suction increase with the increment of radius of the particle.
(3) Calculated values from the proposed model agree well with the experimental results for the lower water content ; however, for the higher water content, the calculation cannot be carried out because proposed model focuses on only isolated pendular rings between two particles.
Further work is needed to analyze pendular rings among multi-particles. Less

  • Research Products

    (18 results)

All Other

All Publications (18 results)

  • [Publications] 中尾隆志、藤田睦博: "等球粒子モデルを用いた不飽和浸透流の微視的解析" 土木学会北海道支部論文報告集. 第48号. 569-574 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 中尾隆志、藤田睦博: "重力を考慮したリング水の保水効果" 土木学会北海道支部論文報告集. 第49号. 615-618 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Takashi Nakao and Mutsuhiro Fujita: "Geostatistical Consideration on the Water Retention Volume and Pore Volume in Unsaturated Gtanular Material" Composed of Various Particles,Proceedings.Stochastic and Statistical Methods in Hydrology and Environmental Engineering. Vol.3. 332-333 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 藤田睦博、中尾隆志、西村貴之: "球形土粒子の空隙分布の解析" 土木学会北海道支部論文報告集. 第49号. 619-622 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 中尾隆志、藤田睦博: "土壌水分特性曲線に及ぼす土壌構造の影響" 土木学会北海道支部論文報告集. 第50号. 400-403 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 藤田睦博、中尾隆志、西村貴之: "軟X線を用いた球形粒子の空隙構造の解析" 土木学会北海道支部論文報告集. 第50号. 369-399 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Nakao and M.Fujita: "Geostastical Consideration on the Water Retention Volume and Pore Vo1ume in Unsaturated Gtanular Material Composed of Various Particles" Stochastic and Statistical Methods in Hydrology and Environmental Engineering. Vol.2. 139-149 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 中尾隆志、藤田睦博: "等球径土粒子の空隙分布の確率論的解析" 土木学会北海道支部論文報告集. 第51号. 6-9 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 西村貴之、藤田睦博、中尾隆志: "軟X線を用いた空隙分布の解析" 土木学会北海道支部論文報告集. 第51号. 10-13 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Takashi Nakao, Mutsuhiro Fujita: "Water Movement in Porous Media Composed of Equable Particles" Proceedings of Hokkaido Branch of JSCE. Vol.48. 569-574 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Mutsuhiro Fujita, Takashi Nakao, Takayuki Nishimura: "Probablistic Characteristics for Void in Soil Composed of Spherical Particles" Proceedings of Hokkaido Branch of JSCE. Vol.49. 615-618 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Takashi Nakao, Mutsuhiro Fujita: "Geostatistical Consideretion on the Water Retention Volum and Pore Volume in Unsaturated Granular Material Composed of Various Particles" Proceedings, Stochastic and Statistical Methods in Hydrology and Environmental Engineering. 332-333 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Takashi Nakao, Mutsuhiro Fujita: "Effect of Water Retention Volume of Pendular Ring Between Two Spheres with Different" Proceedings of Hokkaido Branch of JSCE. Vol.49. 619-622 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Takashi Nakao, Mutsuhiro Fujita: "Effect of Prosity to Moisture Characteristic Curve" Proceedings of Hokkaido Branch of JSCE. Vol.50. 400-403 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Mutsuhiro Fujita, Takashi Nakao, Takayuki Nishimura: "Analysis of Void Distribution among Particles by Using Soft X-ray" Proceedings of Hokkaido Branch of JSCE. Vol.50. 396-399 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Takashi Nakao, Mutsuhiro Fujita: "Geostastical Consideration on the Water Retention Volum and Pore Voulme in Unsaturated Granular Material Composed of Various Particles" Stochastic and Statistical Methods in Hydrology and Environmental Engineering. Vol.2. 139-149 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Takayuki Nishimura, Mutsuhiro Fujita, Takashi Nakao: "Analysis of Void Distribution by Using soft X-ray" Proceedings of Hokkaido Branch of JSCE. Vol.51. 6-9 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Takashi Nakao, Mutsuhiro Fujita: "Analysis of Void Distribution among Equable Particles" Proceedings of Hokkaido Branch of JSCE. Vol.51. 10-13 (1995)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1999-03-09  

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