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Thermally Induced Rock Stress Increment And Rock Reinforcement Response

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.author Ström, Jesse
dc.contributor.author Hakala, Matti
dc.contributor.author Suikkanen, Johannes
dc.contributor.author Siren, Topias
dc.contributor.author Uotinen, Lauri
dc.contributor.author Nuijten, Guido
dc.contributor.editor Johansson, Erik
dc.contributor.editor Raasakka, Ville
dc.date.accessioned 2017-01-19T11:11:05Z
dc.date.issued 2016-05-10
dc.identifier.citation Ström , J , Hakala , M , Suikkanen , J , Siren , T , Uotinen , L & Nuijten , G 2016 , Thermally Induced Rock Stress Increment And Rock Reinforcement Response . in E Johansson & V Raasakka (eds) , 7th International Symposium on In-Situ Rock Stress : Symposium proceedings . RIL , Suomen rakennusinsinöörien liitto RIL , Tampere, Finland , International Symposium on In-Situ Rock Stress , Tampere , Finland , 10/05/2016 . en
dc.identifier.isbn 978-951-758-606-1
dc.identifier.issn 0356-9403
dc.identifier.other PURE UUID: a6fc2ae6-7b29-4111-a2ec-34f856a182fe
dc.identifier.other PURE ITEMURL: https://research.aalto.fi/en/publications/thermally-induced-rock-stress-increment-and-rock-reinforcement-response(a6fc2ae6-7b29-4111-a2ec-34f856a182fe).html
dc.identifier.other PURE FILEURL: https://research.aalto.fi/files/10374310/FFACE_RS2016_3224967_2_FFACE_RS2016_3224967_1_Str_m_et_al_RS2016.pdf
dc.identifier.uri https://aaltodoc.aalto.fi/handle/123456789/24298
dc.description.abstract The thermal heating caused by the deposition of spent nuclear fuel containers increases the in situ rock stress during disposal time. The thermal stress increase was modelled using thermo-mechanical modelling. The numerical codes used to establish the effects of heating on the in situ stress field are outlined, together with the rock mass parameters, in situ stress values, radiogenic temperatures and reinforcement structures. This is followed by a study of the temperature and stress evolution during the repository's operational period and the effect of the heating on the reinforcement structures. It is found that, during excavation, the maximum principal stress is concentrated at the transition areas where the excavation profile changes and that, due to the heating from the deposition of spent nuclear fuel, the maximum principal stress rises significantly in the tunnel arch area of NW/SW oriented central tunnels. However, it is predicted that the rock’s crack damage (CD, short term strength) value of 99 MPa will not be exceeded anywhere within the model. An additional study of the radiogenic heating effect on the brittle deformation zones is included. The main conclusion is that, despite deep reaching damage potential in all the load cases studied the currently designed and used reinforcement types and configurations (rock bolts, shotcrete) are capable of handling the dead weight of the damaged rock should this occur, with damage occurring on the shotcrete liner. The long term safety and stability of the repository during its lifetime can be guaranteed by perceiving the reinforcement strategy in two stages. Firstly, by installing the rock reinforcement to sustain the initial stresses and short term increases from the start of deposition with a monitoring programme in place. Secondly, by installing additional reinforcement, if found necessary through monitoring and observation of the underground facilities. In this way, the effect of any time dependent rock stress increase affecting the reinforcement structures can be observed, in addition to creep based damage, thus providing a better level of safety than a single stage design. en
dc.format.extent 10
dc.format.mimetype application/pdf
dc.language.iso en en
dc.publisher Suomen rakennusinsinöörien liitto RIL
dc.relation.ispartof International Symposium on In-Situ Rock Stress en
dc.relation.ispartofseries 7th International Symposium on In-Situ Rock Stress en
dc.relation.ispartofseries RIL en
dc.rights openAccess en
dc.title Thermally Induced Rock Stress Increment And Rock Reinforcement Response en
dc.type A4 Artikkeli konferenssijulkaisussa fi
dc.description.version Peer reviewed en
dc.contributor.department Kalliosuunnittelu Oy Rockplan Ltd
dc.contributor.department KMS Hakala Oy
dc.contributor.department Posiva Oy
dc.contributor.department Stress Measurement Company Oy
dc.contributor.department Department of Civil Engineering
dc.subject.keyword Olkiluoto repository
dc.subject.keyword radiogenic heating
dc.subject.keyword rock reinforcement
dc.subject.keyword rock damage modelling
dc.subject.keyword design
dc.subject.keyword monitoring
dc.identifier.urn URN:NBN:fi:aalto-201701191243
dc.type.version publishedVersion

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