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Numerical Investigation of Rock Support Arches
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
2019 (English)Independent thesis Advanced level (degree of Master (Two Years)), 80 credits / 120 HE creditsStudent thesis
Abstract [en]

The Garpenberg mine, owned by the Boliden Mining group, has established a trial area at Dammsjön orebody in order to examine the possibility of increasing the productivity of the mine. The mine uses the rill mining method with a current rill height of 15 m. In order to increase the productivity, the mine is examining the possibility of increasing the height of the rill. The trial area is located at 882 m depth surrounded by dolomite on the hangingwall and quartzitic rock on the footwall side. Rock support arches have been installed, in addition to the regular support pattern, to test their effectiveness on stabilizing the ground around the drifts. The arches have been installed in every 6 m and every 3 m in different parts of the test area. Rock samples from the trial area were brought to the university laboratory for testing. The data gathered from the laboratory tests along with the data from the monitoring of the trial area were used to develop a calibrated numerical model. A three-dimensional (3-D) model was therefore created, by using the FLAC3D numerical code. After the calibration of the model a parametric study was conducted for different rill heights and different arch spacing to investigate the performance of the arches. Specifically, the case of no arch installation along with the cases of an installed arch every 6 m and 3 m were tested, for the rill heights of 15 m, 20 m, 25 m and 30 m. The study concluded that the arches assisted in reducing the ground convergence in the production drift. The results also showed that the total height of the rill bench yields regardless of its height. After the yielding, the rockmass can no longer support itself and caves under its own weight. The larger the rill height, the larger the volume of loose rock that has to be supported and thus, higher the convergence. Furthermore, it was also observed that, significant amount of convergence in the production drift occurred during the drifting of the top drive and less during the stoping of the rill bench. This indicates that, the timely installation of the arches is an important criterion for their performance.

Place, publisher, year, edition, pages
2019. , p. 101
Keywords [en]
rock mechanics, rock engineering, rock support arches, artificial pressure arches, mining, FLAC3D, numerical investigation, numerical modeling, Dammsjön orebody, model calibration, rockbolt perfomance, ground support, field measurements, displacements, rock support yielding, rock mass yielding, point load test, rill mining method, Avoca mining method, Boliden, rill bench, parametric study
Keywords [el]
μηχανική πετρωμάτων, μεταλλευτική, υπόγεια έργα, υποστήριξη σηράγγων, υποστήριξη υπόγειων έργων, αριθμητική προσομοίωση διαρροή υποστήριξης, μετατοπίσεις, διαρροή βραχομάζας, τεχνητό τόξο υποστήριξης πετρώματος, δοκιμή σημειακής φόρτισης, παραμετρική ανάλυση, Ακαδημία Αθηνών
Keywords [sv]
bergteknik
National Category
Geotechnical Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-76698OAI: oai:DiVA.org:ltu-76698DiVA, id: diva2:1370079
Subject / course
Student thesis, at least 30 credits
Educational program
Civil Engineering, master's level (120 credits)
Presentation
2019-08-29, 10:00 (English)
Supervisors
Examiners
Available from: 2019-11-15 Created: 2019-11-13 Last updated: 2019-11-15Bibliographically approved

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4344454647484946 of 78
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