터널 숏크리트 계측의 개선방안 = Suggestion for the improvement of the field measurements on the shotcrete lining

국문 초록 (Abstract)

터널현장에서는 터널의 안정성을 평가하기 위하여 숏크리트 계측이 활발히 수행되고 있다. 그러나 숏크리트 응력 측정은 지반하중과 관계없이 발생되는 변형률 및 숏크리트 변형계수의 불확실성, 숏크리트 응력 측정 자체의 어려움 등에 의하여 측정 결과의 신뢰성을 기대하기 어렵다. 본 연구에서는 국내외의 숏크리트 계측의 현황 분석 및 현장 계측 결과를 통하여 기존 숏크리트 계측의 문제점을 분석하였다. 문헌조사 및 터널 현장에서의 무응력 숏크리트 계측 결과를 이용하여 무응력 상태에서 발생하는 숏크라트 응력의 보정 방안을 제시하였다. 또한 측정된 변형률을 응력으로 환산할 경우에 적용할 숏크리트 변형계수를 제시하였다.

다국어 초록 (Multilingual Abstract)

The field measurements on the shotcrete lining are usually performed during the tunnel construction. However, the credibility of the measurements is not certain because of the non-stress related strains occurring in the shotcrete, the uncertainty of the deformation modulus of the shotcrete, and the intrinsic difficulties involved in the strain measurements in the shotcrete. The problem related to the field measurements on the shotcrete is investigated using the review of the previous studies and the field measurement performed for this study. A method for the correction of stress measurements at the shotcrete lining, considering the non-stress related strains, is suggested using the literature review and the actual measurements obtained from the non-stress shotcretes. The deformation modulus used for the calculation of the stress acting on the shotcrete is also suggested.

참고문헌 (Reference)

1 유광호, "터널의 정량적 안정성 평가를 위한 숏크리트 모델링 방법" 사단법인 한국터널지하공간학회 9 (9): 99-107, 2007

2 김성열, "터널막장안정 평가기법 및 막장볼트의 보강효과에 관한 수치해석적 연구" 사단법인 한국터널지하공간학회 11 (11): 11-22, 2009

3 김학준, "터널 진동현식 변형률 게이지의 신뢰성 시험 연구" 대한지질공학회 18 (18): 153-158, 2008

4 홍건호, "콘크리트 강도 및 강성 발현평가에 대한 기초적 연구" 12 (12): 229-236, 1996

5 한국수자원공사, "충주댐 계측자료를 이용한 거동분석(2차): 간극수압, 양압력, 변형 및 응력을 중심으로, 보고서" 한국수자원공사 1989

6 하태욱, "이차원 수치해석에 의한 강지보 성능을 고려한 숏크리트 라이닝의 부재력 평가 방법" 사단법인 한국터널지하공간학회 10 (10): 269-282, 2008

7 에이스인스트루먼트, "에이스인스트루먼트 인터넷 홈페이지 제품 카다로그"

8 장수호, "실대형실험에 의한 조기재령 숏크리트 라이닝의 거동 평가" 1019-1022, 2009

9 이상준, "시간의존성을 고려한 터널지반과 숏크리트의 상호반응거동에 관한 연구" 37 (37): 350-361, 2000

10 박동순, "그라우팅 보강에 의한 터널 라이닝 하중 연구" 경희대학교 2001

11 한국터널공학회, "국토해양부 제정 터널표준 시방서" 씨아이알 135-, 2009

12 박연준, "과지압 하에 있는 대규모 지하공동의 지보 시스템에 관한 연구" 한국암반공학회 14 (14): 154-166, 2004

13 한국터널공학회, "건설교통부 제정 터널설계기준" 씨아이알 138-, 2007

14 Ward, W. H, "Tunnelling in soft ground - General Report" 4 : 261-275, 1981

15 Clayton, C.R. I, "The performance of pressure cells for sprayed concrete tunnel linings" 52 (52): 245-255, 2002

16 Brierley, G. S, "The performance during construction of the liner for a large, shallow underground opening in rock" University of Illinois at Urbana-Champaign 1975

17 Jones, B. D, "Stresses in sprayed concrete tunnel junctions" University of Southampton 2007

18 Pauw, A, "Static modulus of elasticity of concrete as affected by density, Title No. 57-32" 57 : 679-687, 1960

19 ASCE, "Standard practice for shotcrete" American Society of Civil Engineers Press (11) : 66-, 1995

20 Ward, W. H, "Sprayed concrete:tunnel support requirements and the dry mix process"

21 Fernandez-Delgado, G, "Shotcrete, Structural testing of thin liners, Report for Department of Transportation, Federal Railroad Administration" 219-, 1975

22 Barrett, S. V. L, "Shotcrete support design in blocky ground: Towards a deterministic approach" 10 (10): 79-89, 1995

23 Mahar, J. W, "Shotcrete practice in underground construction, Final Report Prepared for Department of Transportation, Federal Railroad Administration" 503-, 1975

24 Corps of Engineers, "Shotcrete for multipurpose tunnel, New Melones Lake, Stanislaus River, California" Corps of Engineers, U. S. Army, Sacramento District 87-, 1974

25 Blanck, J. A, "Shotcrete durability and strength - A practical viewpoint"

26 Yang, C. Y, "Reliability analysis of shotcrete lining during tunnel construction" 133 (133): 975-981, 2007

27 ABNT, "Projeto e execucao de obras de concreto armado. NBR-6118"

28 Geokon, "Products catalogue"

29 Mahar, J. W, "Observations during construction of rock tunnels for the Washington, D. C. Subway" American Institute of Mining, Metallurgical and Petroleum Engineers 1972

30 CEB-FIP, "Model code for concrete structures"

31 Litvin, A, "Laboratory study of shotcrete"

32 Gebler, S. H, "Is 0.85fc’ valid for shotcrete" American Concrete Institute 18 : 3-5, 1992

33 ASA, "Homepage of the American Shotcrete Association"

34 Kusterle, W, "High-grade shotcrete for the single permanent shotcrete lining method" American Society of Civil Engineers 27-51, 1990

35 Morgan, D. R, "High early strength blended-cement wet-mix shotcrete" Shotcrete, American Concrete Institute 18 : 23-27, 1992

36 Ward, W. H, "Ground supports for tunnels in weak rocks" 28 (28): 133-171, 1978

37 Dunnicliff, J, "Geotechnical instrumentation for monitoring field performance" John Wiley & Sons 577-, 1988

38 Parker, H. W, "Field-oriented investigation of conventional and experimental shotcrete, Report for Department of Transportation" Federal Railroad Administration 1975

39 John, M, "Factors of shotcrete lining design" 35 (35): 42-44, 2003

40 Bortz, S. A, "Evaluation of present shotcrete technology for improved coal mine ground control" IIT Research Institute 219-, 1973

41 Pihlajavaara, S. E, "Estimation of drying of concrete at different relative humidities and temperatures of ambient air with special discussion about fundamental features of drying and shrinkage In Creep and Shrinkage in Concrete Structures" John Wiley & Sons 87-108, 1982

42 Brameshuber, W, "Ein Verfahren zur Bestimmung der Fruhfestigkeitsentwicklung von Spritzbeton" (10) : 270-273, 1987

43 Bernard, E. S, "Early-age load resistance of fibre reinforced shotcrete linings" 23 : 451-460, 2008

44 Gebler, S. H, "Durability of dry-mix shotcrete containing regulated-set cement" American Concrete Institute 18 : 44-46, 1992

45 Negro, A. Jr, "Design of shallow tunnels in soft ground" University of Alberta 1480

46 ACI, "Building code requirements for reinforced concrete (ACI 318-89) and commentary -ACI 318R-89" American Concrete Institute 347-, 1992

47 Kuwajima, F. M, "Behavior of shotcrete in shallow tunnels" University of Alberta 1991

48 ACI, "ACI Standard building code requirement for reinforced concrete"

49 Selig, E. T, "A review of stress and strain measurement in soil" University of Arizona 172-186, 1964

50 Parker, H. W, "A practical new approach to shotcrete rebound losses"

51 Golser, J, "A new concept for evaluation of loading in shotcrete linings" 79-85, 1989