Rock mechanical modelling of Keilaniemi metro station of Länsimetro in Finland

Danielle Martinelli, Jesse Ström, Gustav Westerlund, Lauri Uotinen, Guido Nuijten

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Abstract

The design of Länsimetro, the westward extension of the Helsinki–Espoo metro line, presented a wide range of challenging features. These special characteristics required numerical three-dimensional calculations to predict the rock mechanical behaviour of the rock mass. Special attention has been paid to the Keilaniemi station, designed with spans up to 25 m and located next to an existing building and below four yet to be built towers up to 120 m high. Furthermore, in some wide sections of the station, the estimated rock roof is as low as 3 m at its maxi-mum. The calculation took into account the complex geological structures in the area, consisting mainly of blocky hard rock mass with overall Q’ value up to 15, but with some weakness zones in which Q’ is less than 1. The 3-D elastoplastic model was created considering also the contacts that allow slip and separation, in order to obtain the overall behaviour of the excavations. To find the most likely behaviour the calculation was carried out with multiple excavation stages. For the most problematic areas 2-D FEM simulations were used to simulate the behaviour of the rock mass with a joint pattern almost corresponding to the real one.
Original languageEnglish
Title of host publicationRock Engineering and Technology for Sustainable Underground Construction EUROCK 2012, Stockholm 28-30.5.2012
Place of PublicationStockholm
PublisherBeFo - Rock Engineering Research Foundation & Swedish National Group of ISRM
Number of pages11
Publication statusPublished - 2012
MoE publication typeA4 Article in a conference publication
EventISRM International Symposium - Elite Hotel Marina Tower, Stockholm, Sweden
Duration: 28 May 201230 May 2012

Conference

ConferenceISRM International Symposium
Abbreviated titleEurock
CountrySweden
CityStockholm
Period28/05/201230/05/2012

Keywords

  • 3D-FEM
  • hard rock
  • Länsimetro
  • metro station
  • rock mechanics

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