Journal of the Korean Geotechnical Society (한국지반공학회논문집)

Korean Geotechnical Society (한국지반공학회)
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Case Study on Location of Possible Tension Crack in Rock Slope

암반 비탈면의 인장균열 위치 선정에 관한 사례 연구

  • Jeon, Byung-Gon (Taerim Engrg. CO., LTD) ;
  • Kim, Jiseong (Dept. of Cadastre & Civil Engrg., Vision College of Jeonju) ;
  • Kang, Gichun (Dept. of Civil Engrg., College of Engrg., Gyeongsang National Univ.)
  • 전병곤 ((주)태림기술) ;
  • 김지성 (전주비전대학교 지적토목학과) ;
  • 강기천 (경상국립대학교 공과대학 토목공학과)
  • Received : 2021.01.25
  • Accepted : 2021.03.23
  • Published : 2021.03.31
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Abstract

This study aims to investigate the causes and countermeasures for the occurrence of tension cracks in the slope of the rock mass of heavy equipment for road construction. Electric resistivity survey was performed to investigate the expandable tensile crack range. As a result of examining the distribution of soft zones in the rock mass, a low specific resistance zone was found at the bottom of the access road where tensile cracks occurred. It was confirmed that a low resistivity zone was distributed near the top of the excavation slope. Therefore, reinforcements was performed by determining the location of the possible tensile crack as the top of the excavation slope. Two rows of reinforced piles and anchors were proposed as a reinforcement method, and the slope stability analysis showed that the allowable safety factor was satisfied after reinforcements.

본 연구는 도로건설공사 중 발생한 암반 비탈면의 인장균열 발생원인 및 대책 방안을 소개하고자 한다. 확장 가능한 인장균열 범위를 조사하기 위하여 전기비저항 탐사를 수행하여 암반의 연약대 분포 여부를 조사한 결과, 인장균열이 발생한 부체도로 하단에 저비저항대가 나타나며 굴착 비탈면 상단 부근에 저비저항대가 분포하는 것으로 확인되었다. 따라서 발생 가능한 인장균열 위치를 굴착 비탈면 상단으로 결정하여 보강 설계를 수행하였고, 보강방안으로 앵커와 억지말뚝 2열이 제안되었고 비탈면 안정해석을 통하여 보강 이후 허용안전율을 만족하는 것으로 나타났다.

Keywords

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