Scholarly record
THE INFLUENCE OF THE GEOLOGY OF ORE REMNANT ON ITS BEHAVIOR IN THE MINING FIELD
Abstract
High level of mining in Polish copper mines, in the Legnica-Glogow Copper Belt (LGOM), caused an increasing amount of mining works to be carried out in difficult geological and mining conditions, for instance in the vicinity of remnants. Issues related to performing mining operations with the use of the room and pillar mining system in the vicinity of remnants is important in terms of work safety. Remnants are sites of the concentration of high stress values and may affect rock layers of the rock mass located in the roof and in the floor. Remnants can cause seismic events, for example pillar bursts. In-situ mine observations and previous analysis indicate that the behaviour of ore remnants located in the mining fields depends among others on their geology, mostly on the types of rocks from which remnants are built and their geomechanical parameters. This article presents the results of the numerical modelling of the influence of remnant geology on its behaviour in the mining field for room and pillar mining system. The numerical analyses were conducted for the geological and mining conditions characteristic of Polish underground copper mines in the LGOM. Numerical simulations were performed in a plane strain state by means of Phase 2 v. 8.0 software, based on the finite element method. The behaviour of the remnant and of the rock mass in its vicinity was simulated in the subsequent steps of the room and pillar mining system. Three cases of remnant geology were analysed: sandstone remnant, dolomite remnant, sandstone-dolomite remnant. The parameters of the rock mass accepted for numerical modelling were calculated on the basis of the Hoek-Brown classification. The Mohr-Coulomb strength criterion was applied to judge the stability of the remnant.
Publication Impact Profile
Publication details
References13
Salustowicz A., Rock mass mechanics, Mining and Metallurgy Publishing House, Stalinogrod, (in Polish), 1955.
Goszcz A., Elements of rock and rockburst mechanics in Polish coal and copper mines, IGSMiE PAN Publishing House, Cracow, (in Polish), 1999.
Rangasamy T., Jager A.J., A selective review of remnant definitions and creation in the South African gold mining industry, Proceedings SARES 2002, Macceuvlei, South Africa, 2002.
Le Roux P.J., The Extraction of Existing Remnant Blocks of Ground at Harmony Gold Mine’s Free State Operations, Research Report, Faculty of Engineering and the Built Environment, University of the Witwatersrand, Johannesburg, 2008.
Adach-Pawelus K., Butra J., Pawelus D., An attempt at evaluation of the remnant influence on the occurrence of seismic phenomena in a room-and-pillar mining system with roof deflection, Studia Geotechnica et Mechanica, vol. 39, no. 2, p. 3-16, 2017.
Adach-Pawelus K., Influence of the roof movement control method on the stability of remnant, Earth & Environmental Sciences – IOP. III World Multidisciplinary Earth Sciences Symposium, p. 1-10, 2017.
Lenhardt W.A., Hagan T.O., Observations and possible mechanisms of pillar associated seismicity at great depth, in International Deep Mining Conference, Johannesburg, South Africa, SAIMM, Symposium Series S10, p. 1183-1194, 1990.
Pawelus D., Analysis of longwalls stability in the light of horizontal stress field at coal mines, Szkola Eksploatacji Podziemnej, Szczyrk, p. 111-120, (in Polish), 2008.
Pawelus D., The assessment of the underground excavations stability with elastic-plastic model of rock mass and Mohr-Coulomb criterion in region of the R-XI shaft, Cuprum, no. 4 (69), p. 21-40, (in Polish), 2013.
Kaiser P. K., Tang C. A., Numerical simulation of damage accumulation and seismic energy release during brittle rock failure part II: rib pillar collapse. Int. Journ. Rock Mech. Min. Sci., vol. 35, no. 2, p. 123-134, 1998.
Wiles T.D., Lachenicht R., van Aswegen G., Integration of deterministic modelling with seismic monitoring for the assessment of rockmass response to mining: Part I Theory, Proceedings of the Fifth Inter. Symp. on Rockburst and Seismicity in Mines, Johannesburg, p. 379-387, 2000.
Zhu W.C., Li Z.H., Zhu L., Tang C.A., Numerical simulation on rockburst of underground opening triggered by dynamic disturbance. Tunnelling and Underground Space Technology 25, p. 587–599, 2010.
Rocscience, 2013: Phase2 Theory.
View or Download full articleAccess options
SWS access login
Login as SWS Scientific CommitteeLogin as SWS Scientific PartnerLogin as SWS AuthorAuthors and approved SWS contributors will read and export their own linked papers after identity matching by SWS profile, email and SGEM GlobalID.
For librarian assistance: [email protected]
Purchase Instant Access
- Article can be downloaded after successful payment.
- Article may be used according to SWS library access terms.
- Article cannot be redistributed.
