Proceedings of the Korean Geotechical Society Conference (한국지반공학회:학술대회논문집)

Korean Geotechnical Society (한국지반공학회)
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A Study on the Behaviour Mechanism of Jacket Anchor

자켓앵커 거동특성에 관한 연구

  • Kim, Dong-Hee (Dept. of Civil, Environmental and Architectural Engrg., Korea Univ.) ;
  • Kim, In-Chul (Shinhwa Soil Tech. Co., Ltd.) ;
  • Kong, Hyun-Seok (Architecture Technology & Design Group, Architecture Division, posco e&c) ;
  • Lee, Woo-Jin (Dept. of Civil, Environmental and Architectural Engrg., Korea Univ.)
  • 김동휘 (고려대학교 건축.사회환경공학과) ;
  • 김인철 ((주)신화소일테크) ;
  • 공현석 (포스코건설 건축사업본부 건축기술그룹) ;
  • 이우진 (고려대학교 건축.사회환경공학과)
  • Published : 2008.03.28
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Abstract

Jacket anchor was developed to increase the pullout resistance of general ground anchor in soft ground, and the mechanism of pullout resistance of jacket anchor was analyzed. Also, the ultimate bond stress of jacket anchor was estimated by ultimate resistance which is determined by field tests. Grout milk was injected into the jacket to make grout bulb of jacket anchor. The formation of grout bulb of jacket anchor increases the diameter of grout bulb, ground strength and confining pressure between anchor grout and soil. From the twelve field test results, it was observed that the pullout resistance of jacket anchor is 15.38~295.02%(average 83.53%) greater than that of general ground anchor, and plastic deformation of jacket anchor is 20.78~1,496.45%(average 288.78%) smaller than that of general ground anchor at the same load cycle. Especially, it was investigated that the increase of ultimate resistance over 200% and the reduction of plastic deformation over 600% was obtained in gravel layer. It means that the jacket anchor is superior to the general ground anchor in gravel layer. Finally, the ultimate bond stress was proposed to design jacket anchor.

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