A study on the application of the critical strain concept by using the displacements occurring before excavation in tunneling

Si-Hyun* Park

doi:None

All Issue

2008 Vol.10, Issue 4 Preview Page Next Page

A study on the application of the critical strain concept by using the displacements occurring before excavation in tunneling 터널 선행변위를 활용한 한계변형률 개념의 적용 연구

31 December 2008. pp. 337-347

PDF XML

Abstract

Critical strain is a new material property of the ground. Critical strain concept which was established in tunnel engineering can be applied to deformation limits in the ground due to tunneling by using the measured displacement at the tunnel construction site. In this study, quantitative evaluations for the tunnel stability are conducted by analysing the displacement results obtained at the construction field. Especially, critical stain concept was reviewed from a total displacement point of view using the displacements occurring before excavation. As a results, the variation characteristics of the tunnel stability are presented on the critical strain diagram with or without the preceeding displacements.

Keywords

Critical strain

tunnel stability

preceeding displacements

measured displacements

한계변형률은 지반재료에 대한 새로운 역학적 물성치중에 하나이다. 터널공학에서 정립된 한계변형률 개념은, 터널현장에서 계측된 변위를 이용하여 굴착지반의 변형에 대한 한계치 설정에 활용될 수 있다. 본 연구에서는, 실제 터널시공현장에서 계측된 변위를 분석하여 터널에 대한 정량적 안정성을 평가한 것이다. 특히, 터널막장 전방의 선행변위를 이용하여, 터널총변위 관점에서 한계변형률 개념을 검토하였다. 그 결과, 선행변위 유무에 따른 터널안정성의 변화 특성을 한계변형률 도표상에서 파악할 수 있었다.

키워드

한계변형률

터널안정성

선행변위

계측변위

References

1.노원석, 권형석, 강석기 (2006), “수평경사계를 이용한 토사터널의 막장변위 거동특성”, KGS Fall Conference 2006, pp. 1-16.

2.박시현, 신용석 (2007), “한계변형률 개념을 활용한 터널 안정성 평가에 관한 연구”, 한국지반공학회논문집, 제 23권 제5호, pp. 29-42.

3.박시현, 신용석, 배규진 (2008), “터널공학에서 한계변형률 개념의 공학적 의미에 관한 연구”, 한국터널공학회논문집, 제 10권 제 2호, pp. 129-137.

4.정형식, 김성환, 이상돈, 김낙영 (1998), “통계적 방법에 의한 터널 최종변위량 예측에 관한 연구”, 한국지반공학회 봄학술발표회 논문집, pp. 347-356.

5.櫻井春輔 (1982), “トソネル工事における變位計測結果の評価法”, 土木學會論文報告集, 第 317号, pp. 93-100.

6.British Tunnelling Society (2004), Tunnel lining design guide, ICE.

7.Hoek, E. (1998), “Tunnel support in weak rock”, Keynote address, Symposium of Sedimentary Rock Engineering, Taipei, Taiwan, Nov.20-22, pp. 1-13.

8.ISRM. (1981), “Basic geotechical description of rock masses”, Int J. Rock Mech Min. & Geomech Abstr. 18, pp. 85-110.

9.Kontogianni, V., Tzortzis, A. and Stiros, S. (2004), “Defor-mation and faiure of the Tymfristos Tunnel”, Greece, Journal of Geotechnical and Geoenvironmental Engineering, ASCE, October (2004), pp. 1004-1013.

10.Mahendra, S., Bhawani, S. and Jaysing, C. (2007), “Critical strain and squeezing of rock mass in tunnels”, Tunnelling and Underground Space Technology, Vol. 22, pp. 343-350.

11.Sakurai, S. (1997), “Lessons Learned from Field Measure-ments in Tunnelling”, Tunnelling and Underground Space Technology, Vol. 12, No. 4, pp. 453-460.

12.Swarup, A. Goel R.K. and Prasad V.V.R (2000), “Observational Approach for Stability of Tunnels”, Tunneling Asia 2000, New Delhi, pp. 38-44.

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 : 10
No :4
Pages :337-347

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

All Issue