• Title/Summary/Keyword: 키블럭 해석기법

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Key block analysis method for observational design and construction method in tunnels (터널의 정보화 설계시공을 위한 키블럭 해석기법)

  • Hwang, Jae-Yun
    • Journal of Korean Tunnelling and Underground Space Association
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    • v.12 no.3
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    • pp.275-283
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    • 2010
  • Recently, the observational design and construction method in tunnels has been becoming important. Rock masses include various discontinuities such as joints, faults, fractures, bedding planes, and, cracks. The behavior of tunnels in hard rocks, therefore, is generally controlled by various discontinuities. In this study, a new key block analysis method for observational design and construction method in tunnels is proposed, and then applied to the actual tunnel with a super-large cross-section. The proposed analysis method considers finite persistence of discontinuities. The new analysis method can handle concave and convex shaped blocks. To demonstrate the applicability of this key block analysis method for observational design and construction method in tunnels, the analysis results are examined and compared with those of the conventional method.

Removability and Stability Analysis Method of Rock Blocks Considering Discontinuity Persistence in Tunnel Constructions (터널시공에서의 불연속면의 연속성을 고려한 암반블럭의 거동성 및 안정성 해석기법)

  • Hwang, Jae-Yun;Ohnishi, Yuzo;Nishiyama, Satoshi
    • Journal of the Korean Geotechnical Society
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    • v.19 no.2
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    • pp.39-48
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    • 2003
  • Previous analytical models for key blocks have been based on the assumption of infinite persistent discontinuities. In this paper, a key block analysis method considering the finite persistence of discontinuities is proposed as a stability evaluation method in tunnel constructions, and then applied to an actual example site. Three-dimensional rock block identification with consideration of the persistence of discontinuities is performed by using discontinuity disk model. The removability and stability analyses of rock blocks formed by the identification method are performed. The identification method can handle convex and concave shape blocks. In order to demonstrate the applicability of this developed numerical method to the stability evaluation in tunnel constructions, the analytical results are examined and compared one another.

New Observational Design and Construction Method for Rock Block Evaluation of Tunnels in Discontinuous Rock Masses (불연속성 암반에서의 터널의 암반블럭 평가를 위한 신 정보화설계시공법)

  • Hwang Jae-Yun
    • Tunnel and Underground Space
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    • v.16 no.1 s.60
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    • pp.1-10
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    • 2006
  • Rock masses in nature include various rock discontinuities such as faults, joints, bedding planes, fractures, cracks, schistosities, and cleavages. The behavior of rock structures, therefore, is mainly controlled by various rock discontinuities. In many tunnels, enormous cost and time are consumed to cope with the failing or sliding of rock blocks, which cannot be predicted because of the complexity of rock discontinuities. It is difficult to estimate the properties of rock masses before the rock excavation. The observational design and construction method of tunnels in rock masses is becoming important recently. In this paper, a new observational design and construction method for rock block evaluation of tunnels in discontinuous rock masses is proposed, and then applied to the tunnel based on actual rock discontinuity information observed in the field. It is possible to detect key blocks all along the tunnel exactly by using the numerical analysis program developed far the new observational design and construction method. This computer simulation method with user-friendly interfaces can calculate not only the stability of rock blocks but also the design of supplementary supports. The effectiveness of the proposed observational design and construction method has been verified by the confirmation of key block during the enlargement excavation.

New Observational Design and Construction Method in Tunnels and Its Application to Very Large Cross Section Tunnel (터널의 신 정보화 설계시공법과 극대단면 터널에의 적용)

  • Hwang Jae-Yun
    • Journal of the Korean Geotechnical Society
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    • v.20 no.7
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    • pp.5-14
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    • 2004
  • The observational design and construction method in tunnels is becoming important recently. In many tunnels, enormous cost and time are consumed to cope with the failing or sliding of rock blocks, which could not be predicted because of the complexity of rock discontinuities. It is difficult to estimate the properties of rock masses before the construction. In this paper, a new observational design and construction method in tunnels are proposed, and then applied to the example of the very large cross section tunnel based on actual discontinuity information observed in situ. The items examined in developing a program for the new observational design and construction method are the following ones: generality, precision, high speed, and friendly usability. At the very large cross section tunnel, 7 key blocks were judged to be unstable because they could not be supported by standard supports. Supplementary supports were installed to these 7 key blocks before the excavation. It is possible to detect key blocks all along the tunnel exactly by using the numerical analysis program developed for the new observational design and construction method in the very large cross section tunnel. This computer simulation method with user-friendly interfaces can calculate not only the stability of key blocks but also the design of supplementary supports.

Safe tunneling method using numerical modeling of rock blocks in long tunnels (장대터널에서의 암반 블록의 수치 모델링을 이용한 터널 안전 시공법)

  • Hwang, Jae-Yun
    • Journal of Korean Tunnelling and Underground Space Association
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    • v.17 no.2
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    • pp.167-174
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    • 2015
  • Since about 70 percent of the territory is mountainous, more tunnels are constructed in Korea for maximizing the development efficiency. With the increasing number of tunnel construction, safe construction in tunnels has been emerged as the utmost important subject. Recently, the number of long tunnel construction is steeply increased because of the request for high speed and straight road. In this study, a safe tunneling method using numerical modeling of rock blocks in long tunnels is proposed, and then applied to the long tunnel based on real discontinuity information observed in situ. It is possible to detect key blocks all along the tunnel exactly by using the numerical analysis program developed for the safe tunneling method using numerical modeling of rock blocks. This computer simulation method with user-friendly interfaces can calculate not only the stability of rock blocks but also the design of supplementary supports.