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

Simplified protective structure against debris flow for safe transportation in mountainous region

Research Project

Project/Area Number 22656105
Research Category

Grant-in-Aid for Challenging Exploratory Research

Allocation TypeSingle-year Grants
Research Field Geotechnical engineering
Research InstitutionThe University of Tokyo

Principal Investigator

TOWHATA Ikuo  東京大学, 大学院・工学系研究科, 教授 (20155500)

Co-Investigator(Kenkyū-buntansha) UCHIMURA Taro  東京大学, 大学院・工学系研究科, 准教授 (60292885)
YAMADA Suguru  東京大学, 大学院・工学系研究科, 助教 (70451789)
Project Period (FY) 2010 – 2011
Project Status Completed (Fiscal Year 2011)
Budget Amount *help
¥3,580,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥480,000)
Fiscal Year 2011: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Fiscal Year 2010: ¥1,500,000 (Direct Cost: ¥1,500,000)
Keywords斜面崩壊 / 土砂崩落 / ロックシェッド / 衝突圧 / 模型実験 / DEM数値解析 / 地震災害 / 落石 / 衝突力 / トンネル / 数値解析 / 緊急支援
Research Abstract

Damage investigations that were conducted after such significant earthquakes in mountainous regions as the Niigata-Chuetsu earthquake in 2004, the Kashmir earthquake in Pakistan, 2005, and the 2008 Wenchuan earthquake in China demonstrated that problems were caused not only by the strong shaking and related phenomenon but also the post-earthquake instability of mountain slopes that were affected by the shaking. The latter means that slope failures during the period of emergency rescue and re-construction, road transportation at the bottom of unstable slopes is vulnerable to slope failures and is often stopped in particular during rain falls. To protect such important emergency activities from the slope problems, some structural measure was considered necessary. It was thought important further that the planned structure does not have to be so safe as normal structures in sloping ground because the road transportation to be protected is not of the ordinary type but are the emergency veh … More icles whose safety demand is not very high under special situations. Hence, the present research intended to investigate a simple and portable tunnel structure that mitigates the effects of debris flow on road transportation. The central aim was the evaluation of the impact force between debris flow and a protective structure. Because a study on a real-scale structure undergoing debris flow is impossible, a small-scale model study was made. By changing the amount of debris, debris types, the length of a slope, its gradient, and friction of the slope surface, tests were repeated on the distribution of impact pressure, its time history, and bending moment in an affected structure. Accordingly, a regression analysis was made to obtain an empirical formula for those values. The concerned structures were a vertical retaining wall and a tunnel. In addition, an energy viewpoint was introduced to investigate in a more rational manner the mechanism of generation of significant impact force. Furthermore, a discrete element analysis was developed to numerically reproduce the impact phenomenon in a greater scale. These efforts were made to apply results from small-scale model tests to a greater proto type in the field. Less

Report

(3 results)
  • 2011 Annual Research Report   Final Research Report ( PDF )
  • 2010 Annual Research Report
  • Research Products

    (8 results)

All 2012 2011 2010 2009

All Journal Article (1 results) Presentation (7 results)

  • [Journal Article] Experimental study of dry granular flow and impact behavior against a rigid retaining wall2012

    • Author(s)
      Jiang, Y.-J. and Towhata, I.
    • Journal Title

      Rock Mechanics and Rock Engineering

      Volume: 46 Issue: 4 Pages: 713-729

    • DOI

      10.1007/s00603-012-0293-3

    • Related Report
      2011 Final Research Report
  • [Presentation] Dynamic impact of dry granular flow on retaining wall-regression formula for calculation of critical impact force2011

    • Author(s)
      Towhata, I., Jiang, Y.-J.
    • Organizer
      3rd Int.Conf.on Geotechnical Engineering for Disaster Mitigation and Rehabilitation
    • Place of Presentation
      Semarang,インドネシア(招待講演)
    • Year and Date
      2011-05-20
    • Related Report
      2011 Annual Research Report
  • [Presentation] Dynamic impact of dry granular flow on retaining wall-regression formula for calculation of critical impact force, Proc.2011

    • Author(s)
      Towhata, I. and Jiang, Y.-J.
    • Organizer
      3rd Int. Conf. on Geotechnical Engineering for Disaster Mitigation and Rehabilitation
    • Place of Presentation
      Semarang, Indonesia
    • Related Report
      2011 Final Research Report
  • [Presentation] Dynamic impact of dry granular flow on retaining wall-regressionformula for calculation of critical impact force2011

    • Author(s)
      Towhata,I., Jiang, Y.J.
    • Organizer
      Proc.3rd Int.Conf.on Geotechnical Engineering for Disaster Mitigation and Rehabilitation
    • Place of Presentation
      Semarang, Indonesia
    • Related Report
      2010 Annual Research Report
  • [Presentation] Geotechnical Aspects of 2008 Wenchuan earthquake2010

    • Author(s)
      Towhata, I. and Jiang, Y.-J.
    • Organizer
      Chapter 8, Advances in Earthquake Geotechnical Engineering
    • Place of Presentation
      China
    • Related Report
      2011 Final Research Report
  • [Presentation] Dynamic impact of dry granular flow on retaining wall-one linear relation between critical impact force and initial potential energy2010

    • Author(s)
      Jiang, Y.-J. and Towhata, I.
    • Organizer
      4th Japan-Taiwan Joint Workshop on Geotechnical Hazards from Large Earthquakes and Heavy Rainfall
    • Place of Presentation
      Sendai
    • Related Report
      2011 Final Research Report
  • [Presentation] Dynamic impact of dry granular flow on retaining wall-one linear relation between critical impact force and initial potential energy2010

    • Author(s)
      Jiang, Y.J., Towhata, I.
    • Organizer
      4th Japan-Taiwan Joint Workshop on Geotechnical Hazards from Large Earthquakes and Heavy Rainfall
    • Place of Presentation
      仙台
    • Related Report
      2010 Annual Research Report
  • [Presentation] Geotechnical aspects of 2008 Wenchuan earthquake, China, Earthquake Geotechnical Engineering Satellite Conference2009

    • Author(s)
      Towhata, I. and Jiang, Y.-J.
    • Organizer
      XVIIth International Conference on Soil Mechanics and Geotechnical Engineering
    • Place of Presentation
      Alexandria
    • Related Report
      2011 Final Research Report

URL: 

Published: 2010-08-23   Modified: 2016-04-21  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi