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2 results on '"Kampas, G."'

1. Implications of volume loss on the seismic response of tunnels in coarse-grained soils

Author

Kampas, G., Knappett, J.A., Brown, M.J., Anastasopoulos, I., Nikitas, N., Fuentes, R., Kampas, G., Knappett, J.A., Brown, M.J., Anastasopoulos, I., Nikitas, N., and Fuentes, R.

Abstract

This paper examines the seismic response of a “horseshoe–shaped” tunnel, inspired from a recently constructed Metro tunnel in Santiago, Chile. A FE analysis is conducted, investigating the effect of soil density, apparent cohesion, the interface between the tunnel and the surrounding soil, the intensity of the seismic excitation and the effect of volume loss due to tunnel construction on the seismic behaviour of tunnels. The presence of apparent cohesion leads to a reduction of tunnel distress and to smaller post-earthquake ground settlements over a reduced distance from the tunnel. The consideration of volume loss does not significantly affect the acceleration field around the tunnel, but does beneficially decrease the lining forces. Furthermore, although it leads to an increase of the pre-earthquake settlements, it is found to decrease the co-seismic settlements. Finally, it was found that the most conservative model regarding the design detailing of the tunnel lining would be considering a rough interface, zero cohesion, and negligible volume loss (i.e., an ideally-excavated tunnel).

Published
2019

2. Seismic behaviour of tunnels: From experiments to analysis

Author

Ioannis Anastasopoulos, Jonathan Knappett, Emilio Bilotta, Grigorios Tsinidis, Francesco Silvestri, Gopal Madabhushi, Chuan He, Giulia M.B. Viggiani, Nikolaos Nikitas, Youssef M. A. Hashash, Georgios Kampas, Kyriazis Pitilakis, Filomena de Silva, Antonio Bobet, Raul Fuentes, Madabhushi, Gopal [0000-0003-4031-8761], Viggiani, Giulia [0000-0002-0993-0322], Apollo - University of Cambridge Repository, Tsinidis, G., de Silva, F., Anastasopoulos, I., Bilotta, E., Bobet, A., Hashash, Y. M. A., He, C., Kampas, G., Knappett, J., Madabhushi, G., Nikitas, N., Pitilakis, K., Silvestri, F., Viggiani, G., and Fuentes, R.

Subjects
Tunnels, SHM of tunnels, 0211 other engineering and technologies, SHM of tunnel, 02 engineering and technology, 010502 geochemistry & geophysics, 01 natural sciences, Seismic analysis, Vulnerability assessment, Research community, Forensic engineering, Settore ICAR/07, Analysis method, 021101 geological & geomatics engineering, 0105 earth and related environmental sciences, Seismic response, Physical testing, Analysis methods, Centrifuge, Simplified methods, Monitoring system, Building and Construction, Geotechnical Engineering and Engineering Geology, Current (stream), Geology
Abstract

The paper presents a state-of-the-art review of the current understanding of the seismic behaviour of tunnels. Emphasis is placed on recorded responses of actual tunnels during past earthquakes, as well as relevant experimental studies. In particular, the observed seismic performance of tunnels is initially discussed, by providing cases of reported damage during past earthquakes. This is followed by a review of the current monitoring systems for this infrastructure, which can be used to create future case studies based on actual recordings of the seismic response. Subsequently, the paper provides a summary of relevant experimental studies that took place in the centrifuge or on shaking tables, followed by a short discussion of current analytical models, simplified methods and numerical schemes for the seismic analysis and vulnerability assessment of tunnels. Throughout the presentation, the current overall gaps in understanding the seismic response of tunnels are identified in an attempt to stimulate further work in these areas by the research community., Tunnelling and Underground Space Technology, 99, ISSN:0886-7798, ISSN:1878-4364

Published
2020

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