Browse > Article

Pullout Characteristics of MC Anchor in Shale Layer  

Lee, Bongjik (충주대학교 토목공학과)
Kim, Josoon ((주) 에스앤건설)
Lee, Jongkyu ((주) 진산이엔지 기술연구소)
Publication Information
Journal of the Korean GEO-environmental Society / v.13, no.1, 2012 , pp. 53-61 More about this Journal
Abstract
In this study, the research on MC anchor has been developed as composite type has done. MC anchor exerts bearing pressure on pre-bored hole where the end fixing device is expanded. Therefore, the uplift capacity is to be increased and it has the characteristics that the anchor body is not eliminated from the ground even if the grouting is not carried out properly. Furthermore, it reduces the loss of tension and raises the construction availability by inserting the reinforced bar as well as the anchor cable, while it can improve the long-term stability because the nail is expected to play the role when the loss of the anchor cable is occurred in a long-term. However, because the resistance mechanism of the compound anchor such as MC anchor is different from friction anchor, the estimation method of the uplift capacity by the frictional force of the ground and the grout is not proper. Particularly, in domestic cases, the problem to overestimate or underestimate the uplift capacity is expected because the design method considering the soil characteristics about the compound anchor has not been developed. Therefore, in this study, in order to evaluate the characteristics of MC anchor and a kind of compound anchor, we measured the uplift, the tension and the creep by nine anchors tests in shale ground that the fluctuation of the strength is great. In addition, we analyzed the test result comparing to the result of the general friction anchor and evaluated the characteristics of MC anchor movement to gather the results. As a result of the test, we found the effect that the uplift capacity is increased in shale ground comparing to the general friction anchor.
Keywords
Shale layer; MC anchor; Ground anchor; Compound anchor;
Citations & Related Records
연도 인용수 순위
  • Reference
1 그라운드앵커기술협회(1997), 그라운드앵커공법 설계시공 지침, 과학기술, pp. 266-275.
2 김대홍, 이대수, 천병식, 김병홍(2006), 암반에 근입된 부착형 앵커의 거동 특성(I), 한국지반공학회 논문집, Vol. 22, No. 12, pp. 45-55.
3 김홍택, 강인규, 박사원, 고용일, 권영호(1999), 프리텐션 쏘일 네일링 시스템의 안정해석 및 신뢰도 분석, 한국지반공학회지, Vol. 15, No. 2, pp. 105-127.
4 일본지반공학회(1999), 그라운드앵커 공법의 조사.설계.시공, 구미서관, pp. 5-20
5 임종철, 홍석우, 이태형, 이외득(1999), 압축형 앵커의 설계법 개발, 한국지반공학회지, Vol. 15, No. 1, pp. 63-78.
6 한국시설안전기술공단(2006), 건설공사 비탈면설계기준, 구미 서관, pp. 148-152.
7 홍석우(2008), 복합형 앵커의 인발거동에 관한 실험적 연구, 한국지반공학회 논문집, Vol. 24, No. 11, pp. 143-155.
8 Sabatini, P. J., Pas, D. G., Bachus, R. C.(1999), Geotechnical Engineering Circular No. 4 Ground Anchors and Anchored Systems, FHWA-SA-99-015, Office of Bridge Technology Federal Highway Administration, Washington, D.C, pp. 6-28.