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1994 Fiscal Year Final Research Report Summary

A Study of Snow Induced Landslide Behavior And Its Observation System

Research Project

Project/Area Number 05558052
Research Category

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

Allocation TypeSingle-year Grants
Research Field Natural disaster science
Research InstitutionAkita National College of Technology

Principal Investigator

ITO Takeshi  Akita National College of Technology, Dept.of Urban and Environmental Studies, Professor, 環境都市工学科, 教授 (80042315)

Co-Investigator(Kenkyū-buntansha) SATO Satoru  Akita National College of Technology, Dept.of Urban and Environmental Studies, A, 環境都市工学科, 助教授 (30141865)
HASEGAWA Takeshi  Akita National College of Technology, Dept.of General Science, Professor, 一般科目理科, 教授 (10004409)
Project Period (FY) 1993 – 1994
KeywordsLandslide disasters / Analysis of potential landslides / Water quality of melting snow / Telemetalling system / Remote sencing / Mechanical properties of greentuff
Research Abstract

Most of landslide disasters in the snowy regions are considered to be caused by deposited snow, and greentuff geological environment of composite clastic rocks and bentonic soft clays. However, detailed behavior of snow induced landslides, mechanical properties of clastic greentuff are unknown, and still remain to be studied to develop observation system of landslides especially in the snowy seasons.
The main objective of our present research project for a period of two years from 1993 to 1994 is to study above mentioned points. The results obtained in the research project are summarized as follows.
(1) According to the collected records on landslides, huge landslides tend to take place at the late spring because of melting snow and accompanying softened soils.
(2) Soil sampling in the landslide areas in the heavy snowfall regions and laboratory tests of landslide soils were performed, and a constitutive equation for swelling behavior was found, and it was fit for swelling phenomena for all bentonic soils.
(3) From testing results, many effective relationships among the mechanical properties of greentuff soils were obtained, for example, high relationship between residual shear strength and residual angle of internal friction, besides a special relationship between the shear strengths and normal stresses by water contents were found, i.e., Coulomb's law for failure mechanism was not fit for the samples whose water content higher than 35%.
(4) To review the risk degrees of each potential landslides which were pointed out by local government in 1991, principal component analysis method was applied, and new potential landslide maps were thus made for Akita, Yamagata, and Miyagi ptrefectures.These are very useful to prevent and control landslide disasters.
(5) Automatic observation system for snow weather situations was set up at the top of landslide area, and effective results were obtained to make clear the behavior of snow induced landslides.

  • Research Products

    (11 results)

All Other

All Publications (11 results)

  • [Publications] 伊藤 驍: "地すべり危険箇所の危険度評価に関する研究" 東北・北陸地方の豪雪地帯における雪崩と地すべり発生の要因分析法に関する研究、平成2〜4年度試験研究(B)(1)研究成果報告書. 79-89 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 伊藤 驍、江口正紀: "東北・北陸地方の雪による地すべり発生に関する研究" 同上. 59-78 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 伊藤 驍: "積雪地帯の地すべり災害と地すべり危険度に関する研究" 東北地域災害科学研究. 30. 95-100 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] ITO, Takeshi: "A Statistical Study Of Iandslide Disasters In The Snowy Regions" Proc. of the Int'l Conference on Landslide, Slope Stability & the Safety of Infra-Structures. 1. 191-197 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 伊藤 驍: "ネパールの自然災害と防災対策技術" 土木学会東北支部平成六年度技術講座. 29-51 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 伊藤 驍: "積雪による地すべり災害に関する考察" 第11回日本雪工学会大会論文集. 1-2 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T. ITO, R. YATABE & J. TAKAHASHI: International Centre for Integrated Mountain Development (ICIMOD), 96 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Takeshi ITO: "A Study of Evaluation Method on Potential Landslides (in Japanese)" A Study Of Factor Analysis Relating To Avelanches And Landslide At HeavySnowfall Regions In Both Tohoku And Hokuriku Districts, Japan. 79-89 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Takeshi ITO: "Landslide Disasters And Potential Landslide In The Snowy Regions (in Japanese)" Tohoku Journal Of Natural Disaster Science. Vol.30. 95-100 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Takeshi ITO: "A Statistical Study Of Landslide Disasters In The Snowy Regions" Proceedings Of International Conference On Landslides, Slope Stability & The Safety Of Infra-Structures. 1. 191-197 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Takeshi HASEGAWA & Takeshi ITO: "An Observation Of Acid Snow" Research Report Of Akita National College Of Techno logy. Vol.30. 198-201 (1994)

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

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Published: 1996-04-15  

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