A theoretical study of reinforcement influence on the stability of a tunnel face |
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| Authors: | D Peila |
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| Institution: | (1) Dipartimento di Georisorse e Territorio (Tunnelling and Underground-space Center), Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Torino, Italy |
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| Abstract: | Summary The problem of tunnel face stability is studied and the analysis of the stabilizing effect achieved by pre-reinforcement of the core which has to be excavated is dealt with. In Italy, the insertion of longitudinal fibreglass pipes in the ground has proved to be efficient in solving face instability problems. A thorough review of other applications of the technology has been carried out.The results of a series of parametric, three-dimensional, elasto-plastic finite element analyses are presented. The tunnel excavation with or without support and face reinforcement is simulated in the models. The stresses, plastic zones and displacements in the ground, pipes and lining have been studied. The support effect of the pipes is demonstrated by the results. Face reinforcement significantly reduces the displacements of the face. The stresses in the material at the face are also charged from tension to compression, thus enhancing face stability. |
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| Keywords: | Tunnel design ground reinforcement tunnel face stability finite element |
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