Browse > Article
http://dx.doi.org/10.7843/kgs.2010.26.6.5

The Effect of Pressurized Grouting on Pullout Resistance and the Group Effect of Compression Ground Anchor  

Kim, Tae-Seob (Shinhwa Soil Tech. Co., Ltd.)
Sim, Bo-Kyoung (HYUNDAI Engrg. & Construction Co., Ltd.)
Lee, Kou-Sang (Shinhwa Soil Tech. Co., Ltd.)
Lee, In-Mo (School of Civil, Environmental and Architectural Engrg., Korea Univ.)
Publication Information
Journal of the Korean Geotechnical Society / v.26, no.6, 2010 , pp. 5-19 More about this Journal
Abstract
The purpose of this study is to figure out the effect of pressurized grouting on the pullout resistance and the group effect of the compression ground anchor by performing pilot-scale chamber tests and field tests. The laboratory tests are carried out for 3-types of soils which are abundant in the Korean peninsular. Experimental results showed that the enlargement of anchor diameters estimated from the cavity expansion theory matches reasonable well with that obtained from experiments. Moreover, the required injection time as a function of the coefficient of permeability of each soil type was proposed. A series of in-situ anchor pullout tests were also performed to experimentally figure out the effect of pressurized grouting on the pullout resistance. Experimental results also showed that the effect of the pressurized grouting is more prominent in a softer ground with smaller SPT-N value in all of the following three aspects: increase in anchor diameter; pullout resistance; and surface roughness. The pressurized grouting effect in comparison with gravitational grouting was found to be almost nil if the SPT-N value is more than 50. Based on experimental results, a new equation to estimate the pullout resistance as a function of the SPT-N value was proposed. And based on in-situ group anchor pullout tests results, a new group effect equation was proposed which might be applicable to decomposed residual soils which are abundant in the Korean peninsular.
Keywords
Cavity expansion theory; Compression ground anchor; Group effect; Group anchor; Grout consolidation model; Pressurized grouting; Pullout resistance; Pullout test;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
연도 인용수 순위
1 Littlejohn, G.S. (1970), "Soil Anchors", ICE Conference on Ground Engineering, London, pp.33-44.
2 Yu, H.S. and Houlsby, G.T. (1991), "Finite Cavity Expansion in Dilatant Soils : Loading Analysis", Geotechnique, Vol.41, No.2, pp.173-183.   DOI
3 이우진, 이원제, 안신환 (1998), PDA를 이용한 표준관입시험의 에너지전달효율 측정, 한국지반공학회 1998년 봄 학술발표회 논문집, pp.75-84.
4 이인모, 박성원, 정경환, 최항석 (2006), 실내 챔버 실험을 이용한 압력식 쏘일네일링의 거동 분석, 대한토목학회 정기학술대회발표, pp.186-190.
5 이인모, 최항석, 정경환, 박성원, 이충원 (2008), 가압 그라우팅 쏘일네일링의 인발저항력 증가 원인에 관한연구, 한국지반공학회 논문집, 제 24권 4호, pp.1-14.   과학기술학회마을
6 Kleyner, I.M. and Krizek, R.J. (1995), "Mathematical Model for Bore-Injected Cement Grout Installations", Journal of Geotechnical Engineering, ASCE, Vol.121, No.11, pp.782-788.   DOI   ScienceOn
7 Habib, P. (1989), "Recommendations for the Design, Calculation, Construction and Monitoring of Ground Anchorages."
8 Hanna, T.H. (1975), "Anchor Behaviour in Sand", Journal of the Soil Mechanics and Foundation Engineering, ASCE, pp.1741-1742.
9 JGS. (2000), Standards for the Design and Construction of Ground Anchorages, The Japanese Geotechnical Society, JGS 4101-2000.
10 김홍택, 강인규, 권영호, 김찬동 (2002), 압력분사 그라우팅 쏘일 네일의 유효경 평가와 실내모형실험, 대한토목학회 논문집, 제 22권 2-C호, pp.121-131.
11 서형준, 박성원, 정경한, 최항석, 이인모 (2009), 공팽창이론에 의한 압력식 쏘일네일링의 인발저항력 산정, 한국지반공학회 논문집, 제 25권 7호, pp.35-46.   과학기술학회마을