Behavior of a tunnel face reinforced with longitudinal pipes - laboratory investigation

Chung-Sik Yoo; Ki-Ho Yang

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2002 Vol.4, Issue 2 Next Page

Behavior of a tunnel face reinforced with longitudinal pipes - laboratory investigation 실내실험에 의한 수평보강재로 보강된 터널막장의 거동

30 June 2002. pp. 91-100

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Abstract

This paper presents the results of laboratory investigation on the deformation behavior of tunnel face reinforced with longitudinal pipes. A series of reduced-scale model tests was carried out to investigate the effect of reinforcement layout on the tunnel face axial displacement as well as the surface settlement. Among other things, the results of the model tests indicate that the axial displacement of tunnel face as well as the ground surface settlement can significantly be reduced by pre-reinforcing the tunnel face with longitudinal pipes, suggesting that the pre-reinforcing technique may effectively be used as a positive ground control method in the urban environments. Also illustrated is that the reinforcing effect is significantly influenced by the reinforcement layout. The implications of the findings from this study are discussed in a great detail.

Keywords

Face reinforcement

face stability

fiberglass pipe

reduced-scale laboratory test

본 논문에서는 수평보강재로 보강된 터널막장의 거동에 관한 내용을 다루었다. 터널막장 보강공법에 있어서 보강조건이 막장의 수평변위 및 지표침하에 미치는 영향을 고찰하기 위해 축소 모형실험을 수행하였다. 실험결과 수평보강재로 터널막장을 보강할 경우 막장의 변위 및 지표침하가 현저히 감소하는 것으로 나타나 도심지 터널시공에 있어서 지반거동 억제를 위한 보조 공법으로서 효과적으로 적용될 수 있는 것으로 나타났다. 아울러 지반거동 억제 효과는 보강조건에 따라 현저히 차이를 보이는 것으로 나타났다. 본 고에서는 연구결과를 종합하여 실무적용시 주안점을 고찰하였다.

키워드

막장 보강

막장 안정

유리섬유 보강재

축소모형시험

References

1. Arsena, F. P. et al. (1991). “La prima applicazione in Italia del pretaglio meccanico.” Int. Congr. on Soil and Rock Improvement in Underground Works, Milano, pp.649-556.

2. Calvello, M. & Taylor, R.N.(1999). “Centrifuge modelling of a spile-reinforced tunnel heading.” Int. Symp. Geotechnical Aspects of Underground Construction in Soft Ground. Tokyo, pp.345-350.

3. Dias, D. et al. (1998). Behavior of a tunnel face reinforced by bolts: comparison between analytical and numerical models. 2nd Int. Symp. Geotech. Engrg. Hard Soils-Soft Rocks, Napels, Italy.

4. Jassionnesse, C.(1996) Controle du masif reinforce par boulonnage au front de taille d’un tunnel. Etude d’un cas reel en site urbain: Exploitation des mesures et modelisation par une methode d’homogeneisation. Ph.D. thesis INSA Lyon.

5. Lunardi, P. (1991). Aspetti progettuali e costruttivi nella realizzazione di gallerie in situazioni difficili: interventi di precontenimento del cavo: Int. Congr. on Consolidamento del suolo e rocce in so-tterraneo. 2, Milan, pp.567-580.

6. Lunardi, P. et al. (1992). A. Tunnel face rein-forcement in soft ground design and controls during excavation. Int. Congr. Towards New Worlds in Tunnelling. 2, Acapulco, p. 897-908.

7. Peila, D. (1994). A theoretical study of reinforce-ment influence on the stability of a tunnel face. Geotechnical and Geological Engineering, 12, pp. 145-168.

8. Peila, D. et al. (1996). Study of the influence of sub-horizontal fiber-glass pipes on the stability of a tunnel face. Proc. Int. Conf. on Noth American Tunnelling ‘96. 1, pp.425-431.

9. Poma, A. et al. (1995). Finite difference analysis of displacement measurements for optimizing tunnel construction in swelling soils. Field Measurements in Geomechaincs 4th International. Symposium, Bergamo, pp.225-236.

10. Wong, H. et al. (1997). Comportement du front d’un tunnel renforce apr des inclusions en fibre de verre, modele analytique. Geomateriaux Environne-ment Ouvrages, 2, France, pp.133-147.

11. Yoo, C. S. & Shin, H. K. (1999). Behavior of tunnel face pre-reinforced with sub-horizontal pipes. Int. Symp. Geotechnical Aspects of Under-ground Construction in Soft Ground. Tokyo, pp. 345-350.

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 : 4
No :2
Pages :91-100

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

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