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Nasliden project — FEM modelling strategies
8]£
of ~vailable backfill materials (railings from the p!!{nt, desert dune sand and rock from a nearby quarry), selection of backfill materials for the blasthole section and cut and fill stopes, instrumentation for monitoring hanging-wall and footw,~ll beh~vlour and pillar stress° $24072 SUPPORT q:~2AIRIL!TIES OF :~!LL - A NON-LINEAR AN,\LYSIS Hustrulid, W; Moreno~ 0 Proe Conference on the Application of Rock Mech~±nics to Cut ~:nd Fill Mining, Lulea, [i-3 ,Tune i ~ 0 ~ Fi07-]18o Publ London: I~4,
Nonlinear stress-strain curves for several types of hydraulic fill under 1-dimensional strain conditions are presented. A nonlinear elastic analysis is described th.~t can provide the stress and closure distributions in narrow filled veins as a function of mining geometry. The application of the technique is shown by the use of data from the Coeur d'Alene m/nlng district, Idaho, USA.
824073 S ~ E C T I O N AND SPECIFICATION CRITERIA FOR FILLS FOR CUT AND FILL }{ININC Thomas, E O ,°roc Conference on the Application of Rock ~[echanics to Cut and Fill Mining, Lulea, ]-3 June 1950, P128-132. Publ London: I~4M,
Discusses the foll~4ing selection criteria: recovery, permeability, transport ard placement characteristics, and stiffness~ paying p~rticular attention to the latter. Data from Mount Isa and Pancontinent,~l I
rock° The remainder of the model exhibits linear elastic behavlour. The model is evaluated with respect to the given requirements, and its limitations are outlined. 824077 NASLIDEN PROJECT - FE~ MODELLING ~ R A T E G I E S Borg, T Proc Conference on the Application of Rock Mechanics to Cut and Fill ~4ining, Lulea, 1-3 June 1980, P196-203. Publ London: 19~.~,
198l A schematised description is given of the different stages of the project to show its development, together with the strategies that were selected. The 4 sta~es of the project (preinvestigations, first model for comparison with in-situ mearurements, sensitivity study, second improved model) are treated with reference to choice of nmterial models, determination of model properties and control of the calculated values.
824078 DESCRIPTION AND APPLICABILITY OF THE BEFEM CODE Oroth, T Proc Conference on the Application of Rock Mechanics to Cut and Fill Mining, Lulea, 1-3 June 1980, P204-206o Publ London: IMM,
1981 The BEF~d code, developed for rock mechanics problems in hard rock with joints, is a simple F ~ code constructed with the use of triangular and quadrilateral elements. The paper discusses excavation technique, joint model laws (shear and normal stress-displacement behavlour), formulation of joint element, dilatation, representation of fill behaviour. The BEFFN code is beir~ used in the Nasliden project. 824079 sHFAR BEHAVIOUR 0F JOINT E L E ~ ' P S IN THE BP~.'I CODE Jona sson, P Proc Conference on the Applic~tion of Rock Zechanics to Cut and Fill Mitring, Lulea, ]'3 June ]990, P209-212. Publ London: 19@4,
198] Describes the geology and ore conditions and the mining method which is cut-and-fill with hydr~ulic:~ily placed sound fill. 824075 NA[~IDEN PROJECT - ~,U~Y, %~\T FOR AND HOW Wol stud, B Proc Conference on the Application of Rock ~leeh~mz[cs to Cut and Fill Mining, Lulea, ]-3 June 19~0, P!37-]40. Publ London: 17&4~ ]96L Gives a generu£ description of the Nasliden project which is aimed ut evaluating the suitability and reliability of numerical methods, specifically finite element models, as a practical planning instrument in the field of rock mechanics for undergrour~ excam~tioms, with special emphasis on the investigation of cut-a~]-fill mirdnz. 824076 F}~4 MODEL OF NASLIDEN b!INE - REOUIP~w~ENT ] AND LI~TITATIONS Am ~-TART OF P R O ~ C T Kraul'~ rid, N Proc Conference on the Application of Rock }4echr~.nics to Cut and Fill Mining, Lulea, ]-3 June ]980, P74]-]4A. Publ London: IMP{,
The proposed model is 2-dimension~l and incorporutes Joint elements to simulate the weak alter~itlon zone het.~een orebody and side~Tall
FI ',1 ~T ,
!'i
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t
The results of the F~4 joint model calculations in stage 2 of the Nasliden project disclosed large she:._r stress fluctu~Jtions in the joint elements near the roof of the stope. The paper reports an investigation of the phenomenon using a simplified model and the development of a Joint element with new sheer characteristics but unchanged normal chr~racteristics. 824080 S~ENSITIVITY ASPECmS OF FF~ CALCUT~ATIONJ ]9org~ T Proc Conference on the Ap~lic~tion of Rock Mechanics to Cut and Fill Mining 3 Lulea, 1-3 June 1980, P213-225. Publ London: IMN~
198l Sources of error in F~< c~cul'Jtions ,:re discussed idealisstion errors, discretis:
of ~vailable backfill materials (railings from the p!!{nt, desert dune sand and rock from a nearby quarry), selection of backfill materials for the blasthole section and cut and fill stopes, instrumentation for monitoring hanging-wall and footw,~ll beh~vlour and pillar stress° $24072 SUPPORT q:~2AIRIL!TIES OF :~!LL - A NON-LINEAR AN,\LYSIS Hustrulid, W; Moreno~ 0 Proe Conference on the Application of Rock Mech~±nics to Cut ~:nd Fill Mining, Lulea, [i-3 ,Tune i ~ 0 ~ Fi07-]18o Publ London: I~4,
Nonlinear stress-strain curves for several types of hydraulic fill under 1-dimensional strain conditions are presented. A nonlinear elastic analysis is described th.~t can provide the stress and closure distributions in narrow filled veins as a function of mining geometry. The application of the technique is shown by the use of data from the Coeur d'Alene m/nlng district, Idaho, USA.
824073 S ~ E C T I O N AND SPECIFICATION CRITERIA FOR FILLS FOR CUT AND FILL }{ININC Thomas, E O ,°roc Conference on the Application of Rock ~[echanics to Cut and Fill Mining, Lulea, ]-3 June 1950, P128-132. Publ London: I~4M,
Discusses the foll~4ing selection criteria: recovery, permeability, transport ard placement characteristics, and stiffness~ paying p~rticular attention to the latter. Data from Mount Isa and Pancontinent,~l I
rock° The remainder of the model exhibits linear elastic behavlour. The model is evaluated with respect to the given requirements, and its limitations are outlined. 824077 NASLIDEN PROJECT - FE~ MODELLING ~ R A T E G I E S Borg, T Proc Conference on the Application of Rock Mechanics to Cut and Fill ~4ining, Lulea, 1-3 June 1980, P196-203. Publ London: 19~.~,
198l A schematised description is given of the different stages of the project to show its development, together with the strategies that were selected. The 4 sta~es of the project (preinvestigations, first model for comparison with in-situ mearurements, sensitivity study, second improved model) are treated with reference to choice of nmterial models, determination of model properties and control of the calculated values.
824078 DESCRIPTION AND APPLICABILITY OF THE BEFEM CODE Oroth, T Proc Conference on the Application of Rock Mechanics to Cut and Fill Mining, Lulea, 1-3 June 1980, P204-206o Publ London: IMM,
1981 The BEF~d code, developed for rock mechanics problems in hard rock with joints, is a simple F ~ code constructed with the use of triangular and quadrilateral elements. The paper discusses excavation technique, joint model laws (shear and normal stress-displacement behavlour), formulation of joint element, dilatation, representation of fill behaviour. The BEFFN code is beir~ used in the Nasliden project. 824079 sHFAR BEHAVIOUR 0F JOINT E L E ~ ' P S IN THE BP~.'I CODE Jona sson, P Proc Conference on the Applic~tion of Rock Zechanics to Cut and Fill Mitring, Lulea, ]'3 June ]990, P209-212. Publ London: 19@4,
198] Describes the geology and ore conditions and the mining method which is cut-and-fill with hydr~ulic:~ily placed sound fill. 824075 NA[~IDEN PROJECT - ~,U~Y, %~\T FOR AND HOW Wol stud, B Proc Conference on the Application of Rock ~leeh~mz[cs to Cut and Fill Mining, Lulea, ]-3 June 19~0, P!37-]40. Publ London: 17&4~ ]96L Gives a generu£ description of the Nasliden project which is aimed ut evaluating the suitability and reliability of numerical methods, specifically finite element models, as a practical planning instrument in the field of rock mechanics for undergrour~ excam~tioms, with special emphasis on the investigation of cut-a~]-fill mirdnz. 824076 F}~4 MODEL OF NASLIDEN b!INE - REOUIP~w~ENT ] AND LI~TITATIONS Am ~-TART OF P R O ~ C T Kraul'~ rid, N Proc Conference on the Application of Rock }4echr~.nics to Cut and Fill Mining, Lulea, ]-3 June ]980, P74]-]4A. Publ London: IMP{,
The proposed model is 2-dimension~l and incorporutes Joint elements to simulate the weak alter~itlon zone het.~een orebody and side~Tall
FI ',1 ~T ,
!'i
4
t
The results of the F~4 joint model calculations in stage 2 of the Nasliden project disclosed large she:._r stress fluctu~Jtions in the joint elements near the roof of the stope. The paper reports an investigation of the phenomenon using a simplified model and the development of a Joint element with new sheer characteristics but unchanged normal chr~racteristics. 824080 S~ENSITIVITY ASPECmS OF FF~ CALCUT~ATIONJ ]9org~ T Proc Conference on the Ap~lic~tion of Rock Mechanics to Cut and Fill Mining 3 Lulea, 1-3 June 1980, P213-225. Publ London: IMN~
198l Sources of error in F~< c~cul'Jtions ,:re discussed idealisstion errors, discretis: