• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to project page

1991 Fiscal Year Final Research Report Summary

A Study of the Occurrence Mechanism, the Prediction and Prevention Works of Landslides by the Groundwater Flow Analysis

Research Project

Project/Area Number 01460234
Research Category

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

Allocation TypeSingle-year Grants
Research Field 農業土木
Research InstitutionNiigata University

Principal Investigator

YOSHIDA Shoji  Niigata Univ. Fac. of Agriculture Professor, 農学部, 教授 (80018530)

Co-Investigator(Kenkyū-buntansha) TAKAHAMA Nobuyuki  Niigata Univ. Res. Inst. for Hazards Assoc. Prof., 積雪地域災害研究センター, 助教授 (20018948)
SATO Osamu  Niigata Univ. Res. Inst. for Hazards Professor, 積雪地域災害研究センター, 教授 (00022624)
NAKANO Toshio  Niigata Univ. Fac. of Agriculture Assoc. Prof., 農学部, 助教授 (40018544)
Project Period (FY) 1990 – 1991
Keywordslandslide / groundwater level / water quality / pore water pressure / hydraulic conductivity / finite element method / stability analysis / observation of groundwater
Research Abstract

(1) The vertical distribution of water quality in the observation borehole with a screened section along all its length is generated as the results that the groundwater having the highest potential infiltrates into the borehole through its wall and diffuses vertically. And therefore the distribution of water quality in the borehole disagrees with one of groundwater being adjacent to the borehole.
(2) We obtained the following findings from the numerical analysis and the sand model experiments : In such inclined groundflow as one in landslide slopes the water level in the observation borehole having a screened section along all its length disagrees with but appears below the original free surface of groundwater.
(3) A simple finite elements method analyzing steady groundwater flow with a free surface is proposed. This method is applied to all the region involving the unsaturated zone without mesh iteration under the condition of which the hydraulic conductivity is constant in the unsaturated zone. The method can be applied with ease to a wide variety of problems involving complex boundaries and arbitrary degrees of heterogenity. Owing to this method it will be very easier to obtain the pore water pressure along the slip surface which is necessary to the stability analysis of landslide slopes.
(4) In the stability analysis the vertical distribution of the ground water pressure should not be assumed static in the landslide slopes which have inclined unconfined groundwater flow and which have -the multi-s, Lratums with different permeabilities.

  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] 吉田 昭治: "地すべり地地下水の水位・水圧調査法の問題点" 地すべり学会新潟支部第17回シンポジウム:地すべりと地下水について. 20-27 (1989)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 佐藤 修: "Chemical aspect of ground water in landslide area" Proc.The JapanーChina Symposium on Landslides and Debris Flows. 99-104 (1989)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 稲葉 一成: "孔内水位の連続観測と水質調査を併用した地すべり斜面の地下水解析ー東虫亀地区を例として" 地すべり. 28ー3. 17-24 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 吉田 昭治: "地すべり斜面の自由地下水位、地下水圧の観測と解析について" 土と基礎. 39ー12. 29-34 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 吉田 昭治: "不圧浸透流の簡易数値解析法"

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 稲葉 一成: "東虫亀地すべり地の地下水変動特性" 平成2年度 農業土木学会講演要旨集. 206-207 (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 井村 英樹: "全長ストレ-ナ式ボ-リング孔内の水位形成機構に関する研究" 平成2年度 農業土木学会構演要旨集. 208-209 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 吉田 昭治: "自由水面をもつ不圧浸透流の簡易解析法" 農業土木学会京都支部第48回研究発表会講演要旨集. 128-129 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Osamu SATO: "Chemical aspect of ground water in landslide area" Proc. The Japan-China Symposium on Landslides and Debris Flow. 6. (1989)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kazunari IDABA: "Analysis of the characteristics of groundwater by observations of the fluctuation of groundwater levels Higashimushigame and water quality in landslide area" J. Japan Landslide Soc.28(3). 8 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Shoji YOSHIDA: "Observations and Analyses of Free Groundwater Levels and Groundwater Pressure in Landslide Slopes" Tsuchi-to-kiso jssmfe. 39(12). 6 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Shoji YOSHIDA: "A simple Finite Element Method analyzing Steady Groundwater Flow with a Free surface"

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

URL: 

Published: 1993-03-16  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi