All Issue

2018 Vol.17, Issue 4 Preview Page

Research Article

Safety Evaluation of Net-type Debris Flow Protection System Using Numerical Analysis

수치해석을 이용한 네트형 토석류 방호시스템의 안전성 평가

Eung-Beom Lee1
,
Hyun-Taek Lim2
,
Dae-Won Whang3
,
Chang-Su Lim4
,
Yong-Seong Kim5*
이 응범1
,
임 현택2
,
황 대원3
,
임 창수4
,
김 용성5*
1Member, Ph.D. Candidate, Department of Regional Infrastructure Engineering, Kangwon National University, Kangwondaehak-gil 1 Chuncheon-si, Gangwon-do 24341, Republic of Korea
2Nonmember, Ph.D. Candidate, Department of Regional Infrastructure Engineering, Kangwon National University, Kangwondaehak-gil 1 Chuncheon-si, Gangwon-do 24341, Republic of Korea
3Nonmember, Researcher, Department of Regional Infrastructure Engineering, Kangwon National University, Kangwondaehak-gil 1 Chuncheon-si, Gangwon-do 24341, Republic of Korea
4Nonmember, Research Scientist, Rural Development Administration, National Institute of Agricultural Sciences, 166 Nongsaengmyeong-ro, Iseo-myeon, Wanju-gun, Jeollabuk-do 55365, Republic of Korea
5Member, Professor, Department of Regional Infrastructure Engineering, Kangwon National University, Kangwondaehak-gil 1 Chuncheon-si, Gangwon-do 24341, Republic of Korea
* Corresponding Author
30 December 2018. pp. 157-168
PDF XML Citation
Abstract

Recently, the occurrence of typhoons and heavy rainfall is increasing due to climate change. This causes increase in possibility of landslide damages in rural areas. However, in reality, the precise engineering stability assessment studies are still insufficient. Therefore, in order to reduce the landslide damages and effectively manage mountainous areas, the development of disaster prevention techniques is needed. In this study, to analyze the shock absorbing effect of the buffer-spring during application of dynamic impact load in the debris flow protection system, numerical analysis is carried out for each free field of the buffer-spring and the load sharing ratio of the buffer-spring is also examined. In addition, the field applicability is verified by comparison of the tensile strength of the conventional buffer-spring and the wedge type buffer-spring on various magnitudes of dynamic impact load. As a result of the study, it is found that the net-type debris protection system is effective to mitigate loss of properties and human lifes during landslide.

Keywords
Landslide damage
Debris flow
Protection system
Impact load
Numerical analysis

최근 기후 변화로 인한 태풍 및 국지적 집중호우의 발생 빈도가 증가하고 있다. 이로 인해 농촌지역에서는 산사태 피해가 발생할 가능성이 더욱 커지고 있다. 그러나 현실적으로 공학적인 안정성 평가 연구는 미미한 상태이다. 따라서 농촌지역의 산사태 피해를 경감시키고 재해위험이 있는 산간 지역을 효과적으로 관리하기 위해서는 산사태에 대비한 방재 기술의 발전이 필요한 실정이다. 본 연구에서는 토석류 방호시스템에 동적 충격 하중이 작용할 때 완충 스프링의 충격에 대한 완화 효과를 분석하기 위해 완충 스프링 자유장별로 수치해석을 수행하고, 하중분담율에 대하여 고찰하였다. 또한, 기존 완충 스프링과 쐐기형 완충 스프링과의 동적 충격하중 크기 변화에 따른 인장강도에 대한 비교분석으로 현장 적용성을 검증하였다. 연구 결과 네트형 토석류 방호시스템은 산사태 발생 시 토석류에 의한 시설물 및 인명 피해의 손실을 방지하는데 효과적인 것으로 판단된다.

References
1
Cho, S., Yoo, B., Kim, J. and Lee, K. 2016. Performance assessment for debris mitigation structure by using scale model tests, Journal of Korean Society Hazard Mitigation, Vol.16, No.5, pp.247-260.
10.9798/KOSHAM.2016.16.5.247
2
Kim, K., Kim, D., Seo, J., Lee, C., Woo, C., Kang, M., Jeong, S. and Lee, D. 2018. Evaluation stability and functionality of hybrid erosion control dam for reducing debris flow damage in forested catchment nearby urban area, Journal of Korean Society of Forest Science, Vol.107, No.1, pp.59-70.
3
Kim, J., Lee, Y. and Park, K. 2010. A study on model experiment for evaluation of debris flow’s impact force characteristics, Journal of Korean Geotechnical Engineering, Vol.26, No.11, pp.5-15.
4
Lee, E. B., 2018. Performance Evaluation of Wedge-type Buffer Spring in Net-type Debris Flow Protection System Using Numerical Analysis, Master thesis, Kangwon National University (in Korean).
5
Ro, K., Jeon, B. and Jeon, K. 2015. Induction wall influence review by debris flow’s impact force, Journal of Korean Society Hazard Mitigation, Vol. 15, No.2, pp.159-164.
10.9798/KOSHAM.2015.15.2.159
6
Wendeler, C., Volkwein, A., Roth, A., Denk, M. and Wartmann, S. 2007. Field measurements and numerical modelling of flexible debris flow barriers, Debris-Flow Hazards Mitig. Mech. Predict. Assess. Millpress, Rotterdam, pp.681-687.
7
Yamamoto, A., Yamamoto, S., Toriihara, M. and Hirama, K. 1998. Impact load on Sabo dam due to debris flow, 砂防學會誌, Vol.51, No.2, pp.22-30 (in Japanese).
Information
  • Publisher :Korean Geosythetics Society
  • Publisher(Ko) :한국지반신소재학회
  • Journal Title :Journal of the Korean Geosynthetics Society
  • Journal Title(Ko) :한국지반신소재학회 논문집
  • Volume : 17
  • No :4
  • Pages :157-168
  • Received Date : 2018-11-19
  • Revised Date : 2018-12-03
  • Accepted Date : 2018-12-04
  • DOI :https://doi.org/10.12814/jkgss.2018.17.4.157
Journal Informaiton Journal of the Korean Geosynthetics Society Journal of the Korean Geosynthetics Society
  • NRF
  • KOFST
  • KISTI Current Status
  • KISTI Cited-by
  • crosscheck
  • orcid
  • open access
  • ccl
Journal Informaiton Journal Informaiton - close