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2014 Vol.30, Issue 2
An Experimental Study on Pullout Behavior of Shallow Bearing Plate Anchor

얕은 지압형 앵커의 인발거동특성에 관한 실험적 연구

Seok-Woo Hong1*
,
Hyung-Kong Kim2
홍 석우1*
,
김 형공2
1Assistant Prof., Dept. of Civil Eng., DongEui Univ.
2Master of Eng., Dept. of Civil Eng., DongEui Univ.
1동의대학교 토목공학과 조교수
2동의대학교 토목공학과 공학석사, ㈜거원엔지니어링
*교신저자. *Corresponding Author. 
28 February 2014. pp. 5-18
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Abstract

Depending on the underground load support mechanism, anchors are classified as friction anchors, bearing plate anchors and the recently developed combined friction-bearing plate anchors which combine the characteristics of both the friction and bearing plate type anchors. Even though numerous studies have been performed on bearing plate anchors, there were only few studies performed to observe the failure surface of bearing plate anchors. Furthermore most of the soil materials used on these tests were not real sand but carbon rods. In this study, sand was placed in the soil tank and laboratory tests were performed with bearing plate anchors installed with an embedment depth (H/h) ranging from 1～6. The variation in the pullout capacity and the behaviour of soil with the embedment depth (H/h) were observed. Ground deformation analysis program was also used to analyze soil displacement, zero extension direction, maximum shear strain contours. It was determined from the analysis of the results that at ultimate pullout resistance the deformation was 5 mm and the failure surface occurred in a narrower area when compared with results of the previous researches. It was also observed that the width of the fracture surface gradually becomes wider and expands up to the surface as the deformation increases from 10 mm to 15 mm.

Keywords
Friction anchor
Plate anchor
Embedmet ratio
Ultimate pullout resistances
Zero extension direction
Shear strain contours

앵커는 지중에서 힘을 받는 형태에 따라 마찰형 앵커, 지압형 앵커, 마찰지압병용형 앵커로 나눌 수 있으며 최근에는 두 가지 형태가 복합적으로 사용되어지는 앵커가 개발되고 있다. 지압형 앵커에 관하여도 많은 연구가 진행 되었지만, 파괴면을 직접 관찰한 예는 적었다. 그리고 지반재료도 주로 실제 모래가 아닌 탄소봉등을 이용하여 실험을 한 것이 대부분이다. 본 연구에서는 토조에 모래지반을 형성하고, 지압형 앵커를 토피비(H/h)에 따라 1∼6까지 나누어 설치하고 각 토피비에 따른 인발력과 지반의 거동을 관찰하였다. 또한 지반변형해석 프로그램을 통해 지반 변위, 무신축 방향, 최대전단변형률 등고선에 대해서 분석하였다. 분석결과 극한 인발력의 발현시점인 변위 5mm에서는 파괴면의 폭이 기존의 이론보다 좁은 영역에서 진행되는 것을 관찰 할 수 있었고, 10, 15mm까지 변위가 증가할수록 파괴면의 폭이 넓어지고 지표면까지 확장하는 것을 확인할 수 있었다.

References
1
1.Baker, R. (1980), “Determination of the critical slip surface in slope stability compressions”, International Jour. for Numerical and Analytical methods in Geomechanics, Vol.4, pp.333-359.
2
2.Das, B. M. (1990), EARTH ANCHORS, Elsevier, pp.14-49.
3
3.Frydman, S. and Beasley, D. H. (1976), “Centrifugal modelling of riverbank failure”, Jour. Geotech. Eng. proc., ASCE, Vol.102, pp.395-409.
4
4.Hong, S. W. (1998), The study on pullout resistance characteristics and design of SSC anchor, Ph D. thesis, Pusan National University, pp.179-184 (in Korean).
5
5.Im, J. C., Park, S. Z., Joo, I. G., Park, Y. B., and Kim, Y. I. (1992), “Analyzing Method of Model Ground in Plane Strain”, Journal of KGS, pp.29-34(in Korean).
6
6.JGS Geotechnical Engineering (1991), The method and explanation of soil tests, pp.106-115(in Japanese).
7
7.Koo, Y. M. (2013), The study on the development of the program to analyze the deformation on model ground, Master thesis, Pusan National University, pp.1-5 (in Korean).
8
8.Kim, S.S., Lee, S. D., Koo. J. K., Jeon, M. G., and Yoo, K. S. (1994), “A Model Test on Uplift Behavior of Plate Anchor”, KSCE Journal of Civil Engineering, pp.1219-1227 (in Korean).
9
9.Lee, T. H. (2006), The Study on the reinforcement effect of micropile on dense sand, Ph D. thesis, Pusan National University, pp.1-20 (in Korean).
10
10.Meyerhof, G. G. and Adams, J. I. (1968), “The ultimate uplift capacity of foundations”, Can. Geotech J., 5(4) : 225-244.
11
11.Ovesen, N. K. (1981), “Centrifuge Tests of the Uplift Capacity of Anchors”, Proc., 10th Int. Conf. on Soil Mechanics and Foundation Engineering, Stockholm, Sweeden, Vol.I, pp.717-722.
12
12.Roscoe, K. H. (1970), “The influence of strains in soils in soil mechanics”, Geotechnique, Vol.20, No.12, pp.129-170.
13
13.Saeedy, H. S. (1987), “Stability of circular vertical earth anchors”, Can. Geotech J., 24(3):452-456.
14
14.Tani (1986), The mechanism of bearing capacity of Shallow foundation in sand ground, Master thesis, The University of Tokyo, pp.VII.1-VII.3 (in Japanese).
15
15.Vesic, A. S. (1971), “Breakout resistance of objects embedded in ocean bottom”, Journal of Soil Mechanics and Foundations Div. ASCE, 97(9), pp.1183-1205.
16
16.Veesaert, C. J. and Clemence, S. P. (1977), “Dynamic pullout resistance of anchor”, proc., Intl. Symposium on Soil-Structure Interaction Rourkee India, 1:359-397.
17
Received : January 15th, 2013
18
Revised  : March 20th, 2013
19
Accepted : February 10th, 2014
Information
  • Publisher :The Korean Geotechnical Society
  • Publisher(Ko) :한국지반공학회
  • Journal Title :Journal of the Korean Geotechnical Society
  • Journal Title(Ko) :한국지반공학회 논문집
  • Volume : 30
  • No :2
  • Pages :5-18
  • Received Date : 2013-01-15
  • Revised Date : 2013-03-20
  • Accepted Date : 2014-02-10
  • DOI :https://doi.org/10.7843/kgs.2014.30.2.5
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