13 research outputs found
Cross passages between TBM tunnels: The experience in Spanish high‐speed railway tunnels
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Value of geotechnical site investigation in reliability-based design
No full textAdvances in Structural Engineering15111935-1945ASED
Effects of inner sleeves on the inner frictional resistance of open-ended piles driven into sand
No full textGaseous Pretreatment of High-Alloy Steels Used in Ethylene Furnaces: Pretreatment of Incoloy 800
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A THEORETICAL STUDY OF REINFORCEMENT INFLUENCE ON THE STABILITY OF A TUNNEL FACE
No full textThe 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 excawtted 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 stabilit
