Numerical analyses of stability and deformation behavior of reinforced and unreinforced tunnel faces |
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Affiliation: | 1. TERRASOL, 42-52 quai de la Râpée, 75583 Paris Cedex 12, France;2. University Grenoble Alpes, 3SR Laboratory, UMR 5521, Grenoble F-38041, France;3. Grenoble-INP, UJF-Grenoble 1, CNRS UMR 5521, 3SR Lab, Grenoble F-38041, France;4. LGCIE, INSA de Lyon, Lyon, France |
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Abstract: | In traditional tunneling, an analysis of the face stability is required to avoid failure mechanisms or excessive face extrusion. Face reinforcement can improve face stability and reduce deformations. In the present work a numerical study of both unreinforced and reinforced tunnel excavation faces by means of 3D FEM analyses is presented. The results are compared with those of the traditional limit equilibrium method and with an analytical solution based on previous numerical studies. It could be shown that the LEM may lead to non-conservative results. Finally, the deformation response is assessed and the benefits of face reinforcements are investigated. |
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Keywords: | Tunnel face stability Face reinforcement FEM LEM Extrusion |
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