Prediction of primary lining loads for soft ground tunnels based on case studies

Hak-Joon* Kim

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2004 Vol.6, Issue 1 Preview Page Next Page

Prediction of primary lining loads for soft ground tunnels based on case studies 토사터널의 일차 라이닝에 작용하는 하중 예측 사례 연구

31 March 2004. pp. 17-23

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Abstract

Prediction of lining loads is one of the key issues to be addressed in the design of a tunnel. The validity of the existing design methods is reviewed by comparing the loads calculated using the methods with the field measurements obtained from several tunnels in Edmonton, carada. However, the existing methods are determined not to be fully satisfactory for the prediction of primary lining loads. To account for the stress reduction occurring prior to lining installation, the stress reduction factor is used coupled with an analytical solution for calculation of lining loads. Typical values of dimensionless load factors nD/H for tunnels in Edmonton are obtained from parametric analyses and presented in a table. The loads calculated using the proposed method are compared with field measurements collected from tunnels in Edmonton to verify the method. The method can be used for other tunnels if the tunnels are built in stiff or dense soils, where good ground control is accomplished during the tunnel construction.

Keywords

Lining loads

soft ground tunnel

stress reduction

터널 하중을 예측하는 것은 터널 설계에서 가장 중요한 문제 중의 하나이다. 캐나다 에드몬턴시의 여러 터널로부터 측정된 계측자료와 기존에 존재하는 설계방법을 이용하여 계산된 터널 하중의 비교를 통하여 기존 설계방법들의 정확도를 검토하였다. 그러나 기존의 방법들은 터널 하중을 예측하는데 만족하지 못한 결과를 보여 주었다. 일차 라이닝의 설치 이전에 발생하는 응력감소 인자를 구한 후, 기존의 설계방법을 결합하여 터널 하중을 예측할 것을 제안하였다. 에드몬턴시에 건설된 터널에 대한 무차원 하중 인자인 nD/H값이 도표로 제시되었다. 제안된 방법의 타당성을 검증하기 위하여, 제안된 방법으로 계산된 터널 하중과 계측 값을 비교하였다. 다른 지역 터널의 경우, 비교적 견고 (stiff)하거나 조밀 (dense)한 흙으로 구성된 지반에 터널이 건설될 경우에는 제안된 방법을 사용할 수 있다.

키워드

터널 하중

토사 터널

응력 감소

References

1. Cording, E. J., Hendron, A. J. and Deere, D. U. (1971) “Rock engineering for underground caverns”, Proceedings of Underground Rock Chambers Symposium, ASCE, National Meeting on Water Resources Engineering, Phoenix, Arizona, pp. 567-600.

2. Deere, D. U., Peck, R. B., Monsees, J. E. and Schmidt, B. (1969) “Design of tunnel liners and support systems”, Report, U.S. Department of Transportation, Contract No. 3-0152.

3. Einstein, H. H. and Schwartz, C. W. (1979) “Simplified analysis for tunnel supports”, Journal of the Geotechnical Engineering Division, ASCE, No. GT4, pp. 499-518.

4. Eisenstein, Z. and Negro, A. (1990) “Integrated design method for shallow tunnels in soft ground”, Japanese Tunnelling Association Symposium, Japan, Vol. 2, pp. 27-36.

5. Kim, H. J. and Eisenstein, Z. (1998) “Prediction of lining loads from case histories”, World Tunnel Congress ‘98, Sao Paulo, Brazil, pp.

6. Muir Wood, A. M. (1975) “The circular tunnel in elastic ground”, Geotechnique, Vol. 25, No. 1, pp. 115-127.

7. Negro, A. (1988) “Design of shallow tunnels in soft ground”, Ph. D. dissertation, University of Alberta, Edmonton, Alberta, Canada.

8. Panet, H., 1973. “La stabilite des ouvrages souterrains-soutenement et revetement”. Rapport de recherche No. 28. Paris:Laboratoires des Ponts et Chaussee.

9. Peck, R. B., Hendron, A. J. and Mohraz, B. (1972) “State of the art of soft-ground tunneling”, RETC Proceedings, Vol. 1, pp. 259-286.

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 :1
Pages :17-23

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

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