Authors: Bergström, P; Sahala, K; Hakala, M


Cite As:
Bergström, P, Sahala, K & Hakala, M 2014, 'From high stress to de-stressed – mining in changing conditions', in M Hudyma & Y Potvin (eds), Proceedings of the Seventh International Conference on Deep and High Stress Mining, Australian Centre for Geomechanics, Perth, pp. 209-224.

Download citation as:   ris   bibtex   endnote   text   Zotero


Abstract:
This paper aims to describe the changes in stress and rock mass conditions during 13 years of deep mining. Stoping in originally high stress environment has led to detachment and subsidence of remaining oreblocks along schistosity surfaces of the immediate wall rock, while high-stress related seismicity has moved further from the actual mining area. Also presented is history of numerical stress modelling and its correspondence to the observed rock mass behaviour. Finally, adjustments made to mine planning, production and ground monitoring are described.

References:
Antikainen, J 2009, Modelling of stoping for Pyhäsalmi Mine, Calculation memo, Helsinki University of Technology, Helsinki.
Brusila, J & Hakala, M 2001, ‘Yielding pillar design at Pyhäsalmi new mine’, in P Särkkä & P Eloranta (eds), Proceedings of the ISRM Regional Symposium: Eurock 2001, Balkema, Netherlands.
Hakala, M, Somervuori, P & Syrjänen, P 1998, Outokumpu Mining Oy, Pyhäsalmen kaivos: Rock mechanics study for deep extension between levels 1050...1400, (in Finnish), Gridpoint Finland Oy, Helsinki.
Hakala, M, Somervuori, P & Syrjänen, P 1999, Outokumpu Mining Oy, Pyhäsalmen kaivos: Rock mechanics study for deep extension between levels 1050...1400 – Part II, (in Finnish), Gridpoint Finland Oy, Helsinki.
Hakala, M 2001, Outokumpu Mining Oy – Pyhäsalmi New Mine: Study of secondary stresses around deepest stopes between levels 1325 - 1410 and design of monitoring system, Gridpoint Finland Oy, Helsinki.
Hakala, M, Kuula, H, Matinlassi, M, Somervuori, P, Syrjänen, P & Tolppanen, P 2002, Analyses of Tunnel Stress Failures at Pyhäsalmi Mine, Posiva Working Report 2002-28, Posiva Oy, Helsinki.
Hakala, M, Kuula, H, Merjama, S, Somervuori, P & Antikainen, J 2010, Rock Mechanical Study 2010 – Phase 1 for Pyhäsalmi Mine Oy, KMS Hakala Oy, Helsinki.
Hakala, M, Kuula, H, Merjama, S, Somervuori, P & Antikainen, J 2011, Rock Mechanical Study 2010 – Phase 2 for Pyhäsalmi Mine Oy, KMS Hakala Oy, Helsinki.
Lamberg, M, Kuula, H & Hakala, M 2013, Life of Mine Rock Mechanical Simulation for Pyhäsalmi Mine Oy, Research Report, Pöyry Finland Oy, Helsinki.
Ledger, L 1999, Stress measurement in the 1125m level, Outokumpu Oy, Pyhäsalmi Mine, Rock Mechanics Technology Ltd., UK.
Luukkonen, K & Hakala, M 1998, ’Pyhäsalmen kaivoksen syvämalmin hyödyntäminen’ (in Finnish), Louhinta- ja kalliotekniikan päivät 19-20.22.1998, Hyvinkää, SML, RGY ja Suomen kalliomekaniikkatoimikunta, Helsinki.
Mononen, S 2000, Stress measurement with CSIRO-HI cell on levels 1325, 1350, 1375 at Pyhäsalmi (in Finnish), Helsinki University of Technology, Espoo.
Sahala, K 2011, ‘Working under high pressure’, in P Särkkä & J Aho (eds), Rock – Sound of Countless Opportunities, Finnish Tunneling Association, Keuruu.
Sahala, K & Antikainen, J 2005, Numerical Modelling and Microseismic Monitoring of Stoping at Pyhäsalmi (in Finnish), SGY Finnish Geotechnical Society and The Finnish National Group of ISRM, Helsinki.




© Copyright 2019, Australian Centre for Geomechanics (ACG), The University of Western Australia. All rights reserved.
Please direct any queries or error reports to repository-acg@uwa.edu.au