Journal of the Korean Geotechnical Society (한국지반공학회논문집)

Korean Geotechnical Society (한국지반공학회)
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Behavior of Bond-type Shallow Anchors in Rock Masses ( I ) - Metamorphic Rock (gneiss) at Taean Test Site -

암반에 근입된 부착형 앵커의 거동특성 (I) - 태안지역 편마암 -

  • 김대홍 (한국전력공사 전력연구원) ;
  • 이대수 (한국전력공사 전력연구원) ;
  • 천병식 (한양대학교 공과대학 토목공학과) ;
  • 김병홍 (한양대학교 공과대학 토목공학과)
  • Published : 2006.12.31
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Abstract

This paper presents the results of full-scale uplift load tests performed on 30 passive anchors grouted to various lengths at Taean site in Korea. Various rock types were tested, ranging from highly weathered to sound gneiss. Rock anchors were installed over a wide range of rock types and qualities with a fixed anchored depth of $1{\sim}4m$. The majority of installations used SD4O-D51 no high grade steel rebar to induce rock failure prior to rod failure. In many tests, rock failure was reached and the ultimate loads were recorded along with observations of the shape and extent of the failure surface. The test results, the failure mechanisms as well as uplift capacities of rock anchors depend mostly on rock type and quality, embedded fixed length, and the strength of rebar. Based on test results, the main parameters governing the uplift capacity of the rock anchor system were determined.

본 논문에서는 우리나라 태안지역에서 총 30회 수행한 암반앵커 현장시험의 결과를 나타내었다. 대상암반은 편마암으로써 풍화가 심한 것부터 신선한 암에 이르기까지 다양하며, 시험앵커의 깊이는 $1{\sim}4m$로 설치하였다. 앵커는 SD4O-D51mm를 사용함으로써 다른 파괴가 일어나기 전에 암반파괴가 먼저 일어나도록 유도하여 암반의 인발지지력을 파악하고자 하였다. 많은 시험에서 파괴는 극한하중까지 이르는 것을 관찰할 수 있었으며, 암반파괴형상은 암반이 들어올려지면서 방사상으로 균열이 발달하는 형상을 나타내었다. 시험결과, 암반앵커의 인발지지력은 암반의 종류, 암질, 앵커의 정착깊이, 앵커텐던의 인장강도 등에 영향을 받는 것으로 나타났다. 본 시험을 통해 암반앵커시스템의 인발지지력을 지배하는 주요파라메터들을 도출하고 이에 대해 논하였다.

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References

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