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Numerical Analysis of Large Ground Deformation and Rock Support Interaction at Kristineberg Mine, Sweden
Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geoteknologi.ORCID-id: 0000-0001-8001-9745
Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geoteknologi.ORCID-id: 0000-0002-9766-0106
2014 (engelsk)Rapport (Fagfellevurdert)
Abstract [en]

Numerical analyses have been performed to study the interaction between rock support and rock mass in response to large ground deformation at the Kristineberg mine. Ground control problems at the Kristineberg mine is known to be highly influenced by the wall rock geology. The wall rock, that is the footwall and hanging wall, comprise of highly altered chlorite schist, which is internally referred to as talc-schist, very often occur as seams with thickness barely ranging from 0.1 m to as high as 3.0m. These material squeeze and slide into the stope if undercut by the excavation or bends inwards if exposed but not undercut. The magnitude of the deformation has often been reported to be in the order of 0.2 to 0.5 m and seldom up to 1.0 m. Conventional rock have support consisting of fibre re-enforced shotcrete and rebar regularly failed under these conditions. A field investigation has therefore been carried out to study the response of the current rock support system to the different mechanisms of instability at the Kristineberg mine. In addition, a new rock bolt type, called the D-bolt, has been tested during the field tests. The numerical study revealed all the typical mechanisms of instability that have been conceptualized through observations. The performance of rebar is clearly affected by the combinations of bending, shearing and tensile mechanisms. D-bolt, on the other hand, is a ductile rock bolt and, its performance appears to sustain large deformations before showing signs of yielding. However, more work needs to be done before proper conclusions can be made about the performance of the D-bolt under such conditions.

sted, utgiver, år, opplag, sider
2014. , s. 80
HSV kategori
Forskningsprogram
Gruv- och Berganläggningsteknik
Identifikatorer
URN: urn:nbn:se:ltu:diva-24189Lokal ID: a06b731c-c4d5-4a2e-9a63-dea735bafca8OAI: oai:DiVA.org:ltu-24189DiVA, id: diva2:997240
Merknad

Upprättat; 2014; 20130410 (davsai)

Tilgjengelig fra: 2016-09-29 Laget: 2016-09-29 Sist oppdatert: 2018-04-16bibliografisk kontrollert

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