A study on the interpretations of tunnel convergence function parameters

Chang-Yong* Kim; Sung-Wan Hong; Kwang-Yeom Kim; Seung-Han Baek

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2004 Vol.6, Issue 3 Next Page

A study on the interpretations of tunnel convergence function parameters 터널 내공 변위 거동 분석에 관한 연구

30 September 2004. pp. 183-197

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Abstract

The introduction of geodetic methods of absolute displacement monitoring in tunnels has significantly improved the value of the measurements. Structurally controlled behavior and influen- ces of an anisotropic rock mass can be determined, and the excavation and support adjusted accordingly. Three-dimensional finite element simulations of different weakness zone properties, thicknesses, and orientations relative to the tunnel axis were carried out and the function parameters were evaluated from the results. The results were compared to monitoring results from Alpine tunnels in heterogeneous rock. The good qualitative correlation between trends observed on site and numerical results gives hope that by a routine determination of the function parameters during excavation the prediction of rock mass conditions ahead of the tunnel face can be improved. Implementing the rules developed from experience and simulations into the monitoring data evaluation program allows to automatically issuing information on the expected rock mass quality ahead of the tunnel.

Keywords

Tunnel convergence

function parameter

heterogeneous

최근 3차원 절대 계측 기술의 발달을 통해 터널에서의 3차원 계측 기술의 도입 및 결과의 활용에 대한 연구가 다양하게 시도되고 있다. 이러한 계측분석을 통하여 이방성 암반에서 터널 굴착 시 암반의 구조적 거동 및 영향이 파악될 수 있으며, 그에 따른 적절한 지보도 결정되어 질 수 있다. 터널 축에 대하여 서로 다른 연약대 특성, 두께, 방향성을 가지는 암반에서의 굴착에 영향을 확인하기 위해 3차원 해석이 수행되었으며, 내공변위의 function parameter가 계산되었다. 수치해석 결과는 오스트리아 알프스 산악터널의 비균질한 암반에서의 계측결과와 비교분석 되었다. 현장의 계측결과와 수치해석 결과의 상관도가 높게 나타났으며, 이를 토대로 function parameter의 변화를 통해 막장 전방의 지반을 예측하는 것이 가능한 것으로 나타났다.

키워드

터널 내공변위

function parameter

비균질성

References

1. 김창용, 김광염, 홍성완, 배규진 (2003), 터널 내공변위 Function Parameter 결정에 관한 연구, 2003 대한토목학회 추계 학술발표회 논문집, pp. 4872-4877.

2. 문현구, 김창용, 김선홍 (1991), “지하 양수발전소 설계를 위한 불연속 암반의 2차원 및 3차원 응력해석”, 한국자원공학회지, Vol. 28, No. 4, pp. 273-283.

3. ALPEN STRASSE-AG Tunnel Strengen (2003), Unpublished site data.

4. Barlow, J.P. (1986), Interpretation of Tunnel Conver-gence Measurements, MSc Thesis, Dep. of Civil Engineering, University of Alberta, Canada.

5. C. Y. Kim (2003), Investigation of fault zones on displacements, Project report at the Institute for Rock Mechanics and Tunnelling, Graz University of Technology, Austria.

6. Fejzo I. (2002), Untersuchung der GeoFit- Parame-terverlaeufe am Beispiel Inntaltunnel, Diplomarbeit, TU-Graz.

7. Grossauer K. (2001), “Tunnelling in Heterogeneous Ground-Numerical Investigation of Stress and Displacement”, Diplomarbeit, TU-Graz.

8. Grossauer, K., Schubert, W. and Kim, C.Y. (2003), “Tunnelling in heterogeneous ground-stresses and displacements”, Proceedings of the 10th ISRM Congress, South Africa.

9. Panet. M. and Guenot, A. (1982), “Analysis of Convergence behind the Face of a Tunnel”. Tunnelling 1982, The Institute of Mining and Metallurgy, pp. 197-204.

10. Schubert, W. (1996), “Dealing with Squeezing Conditions in Alpine Tunnels”, Rock Mechanics and Rock Engineering, Vol. 29, No. 3, pp. 145- 153.

11. Schubert, W. and Budil, A. (1996), “The Import-ance of Longitudinal Deformation in Tunnel Excavation”, 8th International Congress on Rock Mechanics, Vol. 3, Balkima.

12. Schubert, W., Steindorfer, A. and Button E. A. (2002), “Displacement Monitoring in Tunnels- an Overview”, Felsbau, Vol. 20, No. 2, pp. 7-15.

13. Sellner, P.J. (2000), “Prediction of Displacement in Tunnelling”, Doctoral Thesis, TU-Graz.

14. Sulem, J., Panet, M. and Guenot, A. (1987), “Closure Analysis in Deep Tunnels, Int. Journal of Rock Mechanics and Mining Science”, Vol. 24, No. 3, pp. 145-154.

15. Steindorfer, A. (1998), “Short Term Prediction of Rock Mass Behavior in Tunnelling by Advanced Analysis of Displacement Monitoring Data”, Doctoral Thesis, TU-Graz.

16. Tonon, F. and Amadei, B. (2002), “Effect of Elastic Anisotropy on Tunnel Wall Displacements Behind a Tunnel Face”, Rock Mech. Rock Eng., Vol. 35, No. 3, pp. 141-160.

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 : 6
No :3
Pages :183-197

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

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