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List of products by author: S. D. Lee
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Arching depending on the deformation of the tunnel face
Abstract: Tunnel excavation leads to ground deformation due to the stress redistribution around the tunnel face, causing differences in lateral and longitudinal directions. This arching effect is expected to change the size and shape depending on deformations in the tunnel face. Thus, this study attempted to analyze the arching effects and behaviors of the near ground depending on displacements in the...
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Behavior of the fragmental rocks during the tunnel excavation
Abstract: When a tunnel is excavated, the ground around a tunnel deforms locally and the deformation shape can be influenced by the ground characteristics, the tunnel size and the excavating order. In general, when the bench cut or full face cutting is used by tunnelling, the uniform deformation shape would be occurred above a tunnel crown. Terzaghi(1954) demonstrated that the ground arching (Murayama...
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Ground arching induced by the non-uniform ground deformations
Abstract: When a tunnel is excavated, the ground above tunnel crown can be loosened and ground arching can be developed. And their size and shape would be dependent on the ground deformation characteristics and the distribution shape of local ground deformations. Terzaghi showed that the ground arching was developed due to the uniform ground deformations in the trap door tests. In this study, the...
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The ground Full relaxation and displacements by phased excavation order
Abstract: Model tests were conducted to examine the load transfer and the aching effects on the behavior of the ground around the tunnel due to the phased excavation order at the tunnel face. Tests were conducted in the trapdoor tests apparatus developed by Terzaghi(1946) for 16 cases with different overburdens, which were 0.5D, 1.0D, 1.5D, 2.0D respectively by changing aspects of differential...
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