1,721,093 research outputs found
Behaviour of a Segmental Tunnel Lining under Seismic Actions
No full textFull dynamic analyses that follow a coupled approach for the soil-structure interaction, provides satisfactory interpretation of non-linear boundary problems during earthquakes. This paper illustrates the results of a numerical study aimed at modelling the performance of continuous and segmental linings of shallow tunnel under seismic loading. A set of 3D finite-element full dynamic analyses have been carried out, calibrated on the experimental results of a centrifuge test on a model tunnel in a dense dry sand layer subjected to transversal dynamic loading [1]. The numerical study was extended to model and compare the seismic demand of a continuous and a segmental reinforced concrete lining, including the effect of the excavation process on the pre-seismic conditions and the influence of different input signals. The results show that even in rather simple ground conditions, a suitable constitutive model for soil is needed to capture the effect of soil-lining interaction during and after the seismic even
Scavo di gallerie superficiali in area urbana: analisi sperimentale e numerica di una tecnica di mitigazione del danno potenziale a strutture esistenti
No full textMOVEMENTS INDUCED BY SHALLOW TUNNELS EXCAVATION:AN EXPERIMENTAL AND NUMERICAL STUDY OF A POSSIBLE MITIGATION TECHNIQUE
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Soil-structure interaction in tunnel construction in soft ground
No full textTunnel design and construction involve several specialties and may provide subjects for innovative and multi-disciplinary re- search. A strong integration between structural and geotechnical engineering, among other disciplines, can be likely envisaged in this field. To this aim interdisciplinary research should mainly focus on the solution of soil-structure interaction boundary value problems.
An overview on the current trends of research in this field is provided in the paper over different scales, starting from the be- haviour of the single element of soil, dealing with the interaction between the ground and the tunnel, and finally approaching the interaction between the underground infrastructures and the built environment
Movements induced by shallow tunnel excavation: experimental and numerical study of a possible mitigation technique
No full textDIAPHRAGM WALLS TO MITIGATE GROUND MOVEMENTS INDUCED BY TUNNELLING. EXPERIMENTAL AND NUMERICAL ANALYSIS
Full text linkRoberto Nova, Francesco Colleselli, Vincenzo Caput
Soft Barriers for the Mitigation of Seismic Risk
No full textThis paper gives an insight on the static and dynamic performance of soft buried barriers made of a mixture of soil and a Super Absorbing Polymer (SAP) to be used for the mitigation of seismic risk. Laboratory tests were carried out on sand-SAP mixtures at different relative percentages. The results have been interpreted with reference to the peculiar properties of the two materials (sand and SAP) at the grain scale. The results of the numerical analyses indicate that the higher the SAP content, the higher the isolating effectiveness of the barrier but the worse the overall static behaviour. A balance between the two opposite needs must be found for the most effective desig
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