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Pullout Behavior Characteristics of Enlarged Cylinder Type Anchor Using Numerical Analysis

수치해석을 이용한 확공형 앵커의 인발거동 특성

Joon-Shik Moon1
,
Min-Joo Lee2*
문 준식1
,
이 민주2*
1Member, Assistant Professor, Dept. of Civil Engineering Kyungpook Univ
2Member, Graduate Student, Dept. of Civil Engineering, Kyungpook Univ
*교신저자. *Corresponding Author. 
30 December 2017. pp. 113-118
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Abstract

Numerical analysis was carried out using a finite element analysis program to analyze the behavior characteristics of enlarged cylinder type anchor. It was found that the ultimate resistance of enlarged cylinder type anchor increases with the enlargement angle from numerical analysis for various enlargement angle cases. In the case of 30-60° of enlargement angle, the deformation and stress distribution characteristics in anchor are similar regardless of enlargement angle. However, when the same tensile force is applied, there is a difference in the degree of frictional resistance because of difference of displacement of top of grouting zone. Also, it was found that the maximum compressive force and tensile force were generated at the cone of the upper portion of the grouting zone, and tensile fracture of the upper grouting portion is likely to occur.

Keywords
Enlarged cylinder type anchor
Finite element analysis
End bearing capacity
Axial load of anchor

확공형 앵커에 대한 인발시 거동 특성을 분석하기 위해 유한요소해석 프로그램을 이용하여 수치해석을 수행하였다. 확공형 앵커에 대한 수치해석 결과에서 확개각도의 변화에 따른 앵커의 지지력 비율 결과값과 앵커의 강선에 작용하는 축하중 결과값 의 비교･분석을 통해 확개각도의 크기가 커질수록 앵커의 지지력 증대효과가 나타나는 것을 알 수 있었다. 확개각도가 30~60° 인 경우 앵커인장력에 따른 변형 및 응력분포 특성은 유사하게 나타났으나 동일한 앵커인장력이 작용할 경우 확개각도에 따라 상부 변위발생량의 차이로 인하여 마찰저항력 발현정도에 차이가 나타남을 볼 수 있었다. 또한, 본 연구에서 적용된 확공형 비트가 상부를 원뿔형으로 굴착함에 따라 그라우팅부 상부 원뿔위치에서 최대압축력과 인장력이 발생하는 것이 확인 되었으며, 상부 그라우팅부의 인장파괴가 발생할 가능성이 있음을 알 수 있었다.

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Information
  • Publisher :Korean Geosythetics Society
  • Publisher(Ko) :한국지반신소재학회
  • Journal Title :Journal of the Korean Geosynthetics Society
  • Journal Title(Ko) :한국지반신소재학회 논문집
  • Volume : 16
  • No :4
  • Pages :113-118
  • Received Date : 2017-11-30
  • Revised Date : 2017-12-12
  • Accepted Date : 2017-12-12
  • DOI :https://doi.org/10.12814/jkgss.2017.16.4.113
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