PRELIMINARY STUDY FOR SEISMIC ASSESSMENT OF THE UNDERGROUND FACILITIES AT POINT 5 OF THE LARGE HADRON COLLIDER (LHC) AT CERN

Ugo Carmando, Ahmed Mubarak, Antonio Bilotta, Emilio Bilotta, Jonathan Knappett, Saverio La Mendola, Martin Gastal, Pieter Mattelaer, Luca Sironi, Davide Merlini, Matteo Falanesca, Gianluca Bella, Filippo Gianelli, Marco Andreini

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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Abstract

The European Organisation for Nuclear Research (CERN) is continuously upgrading its extensive underground facilities to cope with the need for new and more complex experiments. The Large Hadron Collider (LHC) houses the Compact Muon Solenoid (CMS) detector at its Point 5, where there are two large shafts, two 100 m deep major parallel caverns, with a total span of 50 m, separated by a 7 m wide and 28 m high concrete pillar, and a system of secondary tunnels and caverns. Such a complex underground infrastructure lies in a sedimentary rock formation (red molasse) of the Geneva basin, with a low rock cover of about 20 m to the overlying 50 m thick layer of water bearing moraine. The site is classified as a zone of moderate seismicity and the underground structures were designed against a “standard” seismic risk, that corresponds to the importance category II according to Eurocode 8. To study the dynamic response of the caverns to seismic waves, a series of Finite Element (FE) full dynamic analyses have been carried out, where the non-linear behavior of the underground layers has been carefully modelled. A suite of input signals that comply with the design spectrum has been applied to the model. The preliminary results are commented in the paper to define the seismic safety requirement for the sensitive infrastructures and installations located inside the tunnels and caverns.

Original languageEnglish
Title of host publicationCOMPDYN 2023
Subtitle of host publicationComputational Methods in Structural Dynamics and Earthquake Engineering
EditorsM. Papadrakakis, M. Fragiadakis
Place of PublicationGreece
PublisherECCOMAS Proceedia
Pages4197-4205
Number of pages9
Volume1
ISBN (Electronic)9786188507296, 9786185827014
DOIs
Publication statusPublished - 2023
EventCOMPDYN 2023: 9th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering - Royal Olympic Hotel, Athens, Greece
Duration: 12 Jun 202314 Jun 2023
https://2023.compdyn.org/

Publication series

NameCOMPDYN Proceedings
ISSN (Print)2623-3347

Conference

ConferenceCOMPDYN 2023
Country/TerritoryGreece
CityAthens
Period12/06/2314/06/23
Internet address

Keywords

  • Damping
  • Dynamic Analyses
  • Finite Element Model
  • Seismic Input Motion
  • Underground Tunnels

ASJC Scopus subject areas

  • Computers in Earth Sciences
  • Geotechnical Engineering and Engineering Geology
  • Computational Mathematics
  • Civil and Structural Engineering

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