A study on the characteristics of multi load transfer ground anchor system

Ji-Ho Kim; Hyeon-Sic Jeong; Oh-Yeob Kwon; Jong-Ho Shin

doi:10.9711/KTAJ.2014.16.1.025

All Issue

2014 Vol.16, Issue 1 Preview Page Next Page

A study on the characteristics of multi load transfer ground anchor system 다중정착 지반앵커의 하중전달 특성에 관한 연구

31 January 2014. pp. 25-50

PDF XML

Abstract

In order to identify a load transfer mechanism of ground anchors, the behavior of multi load transfer ground anchor systems was investigated and compared with those of compression type anchors and tension type anchors. Large scale model tests were performed and stress-strain relationships were obtained. The load transfer mechanism of ground anchors was also investigated in the field tests. Finally, numerical analyses to predict the load-displacement relationships of anchors were conducted. It is concluded that the load transfer characteristics of MLT anchors are mechanically much more superior in the pull-out resistance effect than those of existing compression and tension type anchors. From the results of research work, we could suggest that the max pull-out capacity of anchor capacity to each the soil condition. Also, the MLT anchors can be used to achieve both structural enhancement and economic construction in earth retaining or supporting structures.

Keywords

Multi load transfer ground Anchor

Compression type ground anchor

Tension type ground anchor

Load and shear stress ratio (τ/F)

본 연구에서는 앵커의 대표적 유형인 인장형 앵커와 압축형 앵커, 최근 개발되어 널리 사용되고 있는 다중정착 지반앵커의 지반 내 거동을 비교, 분석하여 그 적용 특성을 평가하였다. 이를 위하여 대형모형실험과 현장시험을 통하여 앵커 유형별 하중-전단응력 관계를 확인하였으며 이를 수치해석 결과와 비교, 분석하였다. 검토결과 앵커 유형에 따른 하중과 지반강도, 전단응력의 관계를 규명할 수 있었으며, MLT 앵커는 인장형 앵커에 비해 1.3배, 압축형 앵커에 비해 1.5배의 인발저항 효과가 있는 것을 확인할 수 있었다. 본 연구결과를 다양한 지반조건에서 확장하여 적용할 경우 지반조건에 따른 앵커 유형별로 적용이 가능한 최대 인발 저항력을 제안할 수 있을 것으로 판단되며, 이는 지반앵커의 설계 및 시공에서 매우 유용하게 이용될 수 있을 것이다.

키워드

TMLT 앵커

압축형 앵커

인장형 앵커

하중-전단응력 비

References

1.Korea Standard association (2006), KS L ISO679, Methods of testing cements - Determination of Strength.

2.British Standards Institution, London. B.S 4447, 1973 : “The performance of prestressing anchorages for post tensioned construction”.

3.Civil Engineering Services Department Hong Kong (1989), “Model specification for prestressed ground anchors”, pp. 51-65.

4.FIP (1982), “Recommendations for the design and construction of prestressed concrete ground anchor”.

5.SIA. Edition Ground Anchors (1977), “Swiss society of engineers and architects”, pp. 28-37.

6.Coates, D.F., Yu, Y.S. (1970), “Three dimensional stress distributions around a cylindrical hole and anchor”, Proc. 2nd Int. Conf. on Rock Mech., Belgrade, pp. 175-182.

Information

Publisher :Korean Tunneling and Underground Space Association
Publisher(Ko) :한국터널지하공간학회
Journal Title :Journal of Korean Tunnelling and Underground Space Association
Journal Title(Ko) :한국터널지하공간학회 논문집
Volume : 16
No :1
Pages :25-50
Received Date : 2014-01-03
Revised Date : 2014-01-14
Accepted Date : 2014-01-20
DOI :https://doi.org/10.9711/KTAJ.2014.16.1.025

Journal of Korean Tunnelling and Underground Space Association ISSN:2233-8292(Print) 2287-4747(Online) 한국터널지하공간학회 논문집

All Issue