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New Observational Design and Construction Method for Rock Block Evaluation of Tunnels in Discontinuous Rock Masses  

Hwang Jae-Yun (부산대학교 공과대학 토목공학과)
Publication Information
Tunnel and Underground Space / v.16, no.1, 2006 , pp. 1-10 More about this Journal
Abstract
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.
Keywords
Discontinuous rock mass; Observational design and construction method; Computer simulation; Key block; Tunnel;
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Times Cited By KSCI : 1  (Citation Analysis)
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