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Laboratory investigation of rock-shotcrete debodningdue to ice growth using acoustic emission
Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geoteknologi.
Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geoteknologi.ORCID-id: 0000-0001-9419-2207
Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geoteknologi.ORCID-id: 0000-0002-9766-0106
Rekke forfattare: 32016 (engelsk)Inngår i: Proceedings of the 8th International Symposium on Ground Support in Mining and Underground Construction / [ed] E . Nordlund, T.H. Jones and A. Eitzenberger (eds), 2016Konferansepaper, Publicerat paper (Fagfellevurdert)
Abstract [en]

Road and railway tunnels in cold regions are often affected by problems related to water leakage and freezing temperatures. Water leakage in a tunnel leads to ice growth when the temperature goes below freezing and creates favourable environment for fallouts of shotcrete and rock. This paper presents results and observations from laboratory freezing – thawing experiments on rock blocks covered with shotcrete and focuses on the degradation of the shotcrete-rock interface due to ice growth.. The initiation and the development of freeze-induced micro cracks in shotcrete-rock interface were studied by continuously monitoring acoustic emissions (AE) and temperature. The clustering of the AE events during freezing and thawing indicates that micro cracks appeared in the shotcrete-rock interface and caused adhesion failure. The larger number of AE events in the panels, with access to water during freezing, confirmed that water contributes to material deterioration and also reduces the adhesive strength.

sted, utgiver, år, opplag, sider
2016.
HSV kategori
Forskningsprogram
Gruv- och Berganläggningsteknik
Identifikatorer
URN: urn:nbn:se:ltu:diva-61142ISBN: 978-91-7583-804-5 (digital)OAI: oai:DiVA.org:ltu-61142DiVA, id: diva2:1057702
Konferanse
Ground Support 2016 : 11/09/2016 - 14/09/2016
Tilgjengelig fra: 2016-12-19 Laget: 2016-12-19 Sist oppdatert: 2017-11-24bibliografisk kontrollert

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Mainali, GaneshDineva, SavkaNordlund, Erling

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