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1991 Fiscal Year Final Research Report Summary

Effects of heterogeneities of soils on the stability of slopes

Research Project

Project/Area Number 01480084
Research Category

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

Allocation TypeSingle-year Grants
Research Field 農業土木
Research InstitutionThe University of Tokyo

Principal Investigator

MIYAZAKI Tsuyoshi  The University of Tokyo, Faculty of Agriculture, Associate Professor, 農学部, 助教授 (00209892)

Co-Investigator(Kenkyū-buntansha) SHIOZAWA Sho  The University of Tokyo, Faculty of Agriculture, Assistant Professor, 農学部, 助手 (80134154)
Project Period (FY) 1989 – 1991
KeywordsFingering / Funneled flow / Refraction flow / Unsaturated flow / Slope / Heterogeneity of soils / Preferential flow / Surface crust
Research Abstract

The purpose of this study was to investigate the effects of soil heterogeneities such as surface crusts, cracks, traffic pans, hard pans, macropores due to activities of plant and soil animals and artificial soil cuttings and bankings on the stability of slopes. The following three conclusions were obtained :
1. REFRACTION OF FLOW OF WATER IN LAYERED SOILS
It is well known that stream lines in saturated layered soils refract at the interface between two media having different hydraulic properties, but the behaviour of stream lines in layered unsaturated soils were vague. This study clarified the physical properties of refraction of water flow in unsaturated soils theoretically and experimentally. The visualization technique was developed to verify the refraction law in saturated and unsaturated layered soils.
2. PREFERENTIAL FLOW IN HETEROGENEOUS SOILS
Preferential flows were classified into bypassing flow, fingering flow and funneled flow. The physical properties of funneled flow were investigated experimentally by using 8 mm video camera, semiconductor pressure transducers and a dye and the qualitative and quantitative relation between the funneled flow and fingering flow was clarified. Saturated flow model and unsaturated flow model were applied to analyse the funneled flow.
3. THE RELATION BETWEEN HETEROGENEITY AND STABILITY OF SLOPES
The effects of surface crust on flow of water and stability of slopes were investigated experimentally. The effect of preferential flow on the stability of a model slope was also investigated experimentally. Further investigations are required to make clear the theoretical aspects of the effects of soil heterogeneities and preferential flows on the stability of slopes.

  • Research Products

    (16 results)

All Other

All Publications (16 results)

  • [Publications] T.MIYAZAKI: "Visualization of Refractional Water Flow in Layered Soils" Soil Science,. 149(5). 317-319 (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.MIYAZAKI: "Refraction,Fingering and lateral Water Flow in Layered Soils" EOS,Transactions,American Geophysical Union,. 71. 869 (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.MIYAZAKI: "A Statistical Approach for Predicting Accuracies of Soil Properties Measured by Single,Double and Dual Gamma Beams," Journal of Soil Science,. 42. 127-137 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 宮崎 毅: "成層土における定常浸透流の屈折現象について" 農業土木学会論文集. 152. 75-82 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 宮崎 毅,中野 政詩,塩沢 昌,井本 博美: "土壌微生物が土の透水係数に及ぼす影響について" 農業土木学会論文集. 155. 69-76 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.MIYAZAKI: "Water Movement in Heterogeneous Soils" 3rd Joint seminer JICA-IPB Technical Cooperation on Agricultural Engineering and Technology. (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.MIYAZAKI: "Mercel Dekker,Inc." water Flow in Soils, (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T. Miyazaki: "Visualization of Refractional Water Flow in Layered Soils" Soil Science. 149(5). 317-319 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T. Miyazaki: "Refraction, Fingering and Lateral Water Flow in Layered Soils" EOS, Transactions, American Geophysical Union. 71. 869 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T. Nishimura: "Effects of crust formation on soil erodibility" Trans. JSIDRE. 146. 101-107 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T. Miyazaki: "Refraction of steady water flow in layered soils" Trans. JSIDRE. 152. 75-82 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T. Miyazaki: "A Statistical Approach for Predicting Accuracies of Soil Properties Measured by Single, Double and Dual Gamma Beams" Journal of Soil Science. 42. 127-137 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T. Miyazaki: "Soil-Water flow in the closed systems and open systems" Jour. JSIDRE. 59, No. 8. 957 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T. Miyazaki: "The effects of microorganisms on the permeability of soils" Trans. JSIDRE. 155. 69-76 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y. Kohgo: "Elastoplastic Constitutive Modelling for Unsaturated Soils" Computer Methods and Advances in Geomechanics. Beer, Booker and Carter. 631-636 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T. Miyazaki: Mercel Dekker, Inc.Water Flow in Soils, (1992)

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

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Published: 1993-03-16  

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