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  Proposal of Tunnel Excavation Analysis Considering the Effect of the Ground Weight

  In tunnel excavation, it is important to stabilize the face and to control the settlement of the ground. However, when examining the possibility of the collapse of the face, in numerical analysis, there may be a form in which the ground in front of the face flows into the tunnel due to the weight of the ground and the pushing out phenomenon of the face in the forward region. In some numerical analyses showing the latter type, the displacement of the face can be seen symmetrically, and the collapse phenomenon due to the natural weight of the natural ground may not be reproduced. Therefore, in this study, we investigated an analysis method to reproduce the collapsed state of the face close to a real phenomenon using 3D numerical analysis. As a result, it was found that the phenomenon that the face fell due to the weight of the natural ground cannot be reproduced in the area not affected by the ground surface.

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