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2020 Vol.30, Issue 4 Preview Page

Research Article

A Study on the Change of Slope Safety Factor according to the Anchor Construction Interval

앵커 시공 간격에 따른 비탈면 안전율 변화 연구

Jinhwan Kim1
,
Jonghyun Lee2
,
Oil Kwon3
,
Wooseok Kim4*
김 진환1
,
이 종현2
,
권 오일3
,
김 우석4*
1Senior Researcher, Multi Disaster Countermeasures Research Center, KICT
2Research Fellow, Multi Disaster Countermeasures Research Center, KICT
3Research Fellow, Construction Project Task Force, KICT
4Senior Researcher, Construction Industry Promotion Department, KICT
1한국건설기술연구원 복합재난대응연구센터 수석연구원
2한국건설기술연구원 복합재난대응연구센터 연구위원
3한국건설기술연구원 건설사업추진단 연구위원
4한국건설기술연구원 건설산업진흥본부 수석연구원
*Corresponding Author
31 December 2020. pp. 515-523
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Abstract

If the safety factor does not secure the safety factor suggested in the design standard at the slope design stage, the safety factor is secured by installing an anchor. Stability analysis is used to verify the effect of reinforcing the slope of the anchor, but in this process, most of the anchor construction intervals are assumed to be equal and analyzed. For economical and effective slope reinforcement, stability analysis is required by adjusting the anchor construction interval. In this study, the effect of the anchor construction interval on the change of the safety factor of the slope was identified. Stability analysis was performed by setting a virtual slope with two berms and different anchor construction intervals. As a result of the analysis, the stability of the slope is secured when the anchor spacing of the lower surface is narrowed and the anchor gaps of the upper and middle surfaces are wider than when anchors are installed at the same intervals on the upper, middle, and lower surfaces of the slope. The result was a 15% reduction in the amount of anchors. This means that, rather than reinforcing anchors at the same intervals, it is economical and effective to have an economical and effective reinforcement effect to vary the anchor construction intervals according to the slope characteristics.

Keywords
slope
stability analysis
anchor construction interval
factor of safety

비탈면 설계 단계에서 안전율이 설계기준에서 제시하고 있는 안전율을 확보하지 못할 경우, 앵커를 시공하여 안전율을 확보하게 된다. 안정해석을 통해 앵커의 비탈면 보강 효과를 검증하고 있으나 이 과정에서 앵커 시공 간격은 대부분 등간격으로 가정하여 해석을 한다. 경제적이면서 효과적인 비탈면 보강을 위해 안정해석 대상 비탈면 내에서 앵커 시공 간격을 조정한 안정해석이 필요하다. 본 연구에서는 앵커 시공 간격이 비탈면의 안전율 변화에 미치는 영향을 파악하였다. 이를 위해 가상의 2소단 비탈면을 설정하고 앵커 시공 간격을 다르게 하여 안정해석을 수행하였다. 해석 결과, 비탈면의 상단면, 중단면, 하단면에 동일한 간격으로 앵커를 시공한 경우 보다 하단면 앵커 간격을 좁게하고 상단면, 중단면의 앵커 간격을 넓게 경우에 비탈면의 안정성을 확보하면서도 약 15%의 앵커 물량을 절감하는 결과가 나타났다. 이는 동일한 간격으로 앵커보강을 하기 보다는 비탈면 특성에 맞게 앵커 시공 간격을 다르게 하는 것이 경제적이면서 효과적인 보강효과가 있음을 의미한다.

키워드
비탈면
안정해석
앵커 시공 간격
안전율
References
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Information
  • Publisher :Korean Society of Engineering Geology
  • Publisher(Ko) :대한지질공학회
  • Journal Title :The Journal of Engineering Geology
  • Journal Title(Ko) :지질공학
  • Volume : 30
  • No :4
  • Pages :515-523
  • Received Date : 2020-11-09
  • Revised Date : 2020-11-24
  • Accepted Date : 2020-11-25
  • DOI :https://doi.org/10.9720/kseg.2020.4.515
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