Numerical Simulation of Consolidation Behavior of Large Hydrating Fill Mass

다국어 초록 (Multilingual Abstract)

Underground mined-out voids need to be backfilled for the stability of the surrounding rock and also to increase ore extraction from adjacent pillars. One of the relatively newer means is cemented paste backfilling, which has been extensively adopted in underground mining operations around the world. During and after the placement of cemented paste backfill (CPB) into stopes, complex multiphysics (thermal, hydraulic, mechanical and chemical) processes take place in the large mass of CPB and could affect its consolidation behavior. An analysis of the consolidation process in CPB mass is essential for the assessment of CPB behavior and cost-effective designs in practice. In this paper, multiphysics simulation of the consolidation behavior of CPB mass is performed under different conditions, including the mixture recipe, and backfilling, drainage, surrounding rock and curing conditions. It is found that the in situ consolidation behavior of CPB structures is a function of the multiphysics processes that occur in the cementing backfill mass. Moreover, the rock mass conditions, including the geometry and rock wall roughness, influence the consolidation process of CPB structures. Cement content, curing time and backfilling rate play a crucial role in the consolidation process of CPB. The obtained results can facilitate a better understanding of the consolidation behaviour of CPB for backfill designers and engineers, and thus contribute to enhance the engineering of CPB structures.

목차 (Table of Contents)

• Abstract
• 1. Introduction
• 2. Mathematical models
• 3. Model Validation
• 4. Model Applications
• 5. Conclusions
• References

참고문헌 (Reference)

1 Ghirian, A., "experimental investigations of the thermo-hydromechanical-chemical behavior of cemented paste backfill" (378)371-(378)311, 2013

2 Haiqiang, J., "Yield stress of cemented paste backfill in sub-zero environments : Experimental results" 92 : 141-150, 2016

3 Khaldoun, A., "Valorization of mining waste and tailings through paste backfilling solution, Imiter operation, Morocco" 26 (26): 511-516, 2016

4 Grice, T., "Underground mining with backfill" 234-239, 1998

5 Biot, M. A., "Theory of elasticity and consolidation for a porous anisotropic solid" 26 (26): 182-185, 1955

6 Terzaghi, K., "Theory of consolidation" John Wiley &Sons lnc 1943

7 Yilmaz, E., "The factors affecting the strength and stability of paste backfill" 28 (28): 155-169, 2003

8 Dirige, A., "The effect of stope inclination and wall rock roughness on back-fill free face stability" (4152) : 1-12, 2009

9 Jehring, M. M., "Tailings composition effects on shear strength behavior of co-mixed mine waste rock and tailings" 11 (11): 1147-1166, 2016

10 Tariq A, "Synergistic and environmental benefits of using cement kiln dust with slag and fly ash in cemented paste tailings" University of Western Ontario 2012

11 Li, L., "Stress distribution in a cohesionless backfill poured in a silo" 8 : 1-8, 2014

12 Yilmaz, E., "Stope depth effect on field behaviour and performance of cemented paste backfills" 32 (32): 273-296, 2018

13 Fahey, M., "Some aspects of the mechanics of arching in backfilled stopes" 46 (46): 1322-1336, 2009

14 Fall, M., "Potential use of densified polymer-pastefill mixture as waste containment barrier materials" 30 (30): 2570-2578, 2010

15 Ceccato, F., "Numerical study of partially drained penetration and pore pressure dissipation in piezocone test" 2016

16 Suazo, G., "Numerical simulation of blast response of cemented paste backfills" 2394-2401, 2015

17 Li, L., "Numerical investigation of the stress state in inclined backfilled stopes" 9 (9): 52-62, 2009

18 Cui, L., "Multiphysics modelling of the behaviour of cemented tailings backfill materials" (330) : 1-7, 2015

19 Cui, L., "Multiphysics modeling of arching effects in fill mass" 83 : 114-131, 2017

20 Cui, L., "Multiphysics model for consolidation behaviour of cemented paste backfill" 040160771 : 0401607723-, 2016

21 Ai, Z. Y., "Multi-dimensional consolidation of layered poroelastic materials with anisotropic permeability and compressible fluid and solid constituents" 10 (10): 263-273, 2015

22 Cui, L., "Modeling and simulation of the consolidation behaviour of cemented paste backfill" 1-5, 2015

23 Fall, M., "Mix proportioning of underground cemented tailings backfill" 23 (23): 80-90, 2008

24 Shahsavari, M., "Mine backfill pore water pressure dissipation:Numerical predictions and field measurements" 1-8, 2015

25 Cui, L., "Mechanical and thermal properties of cemented tailings materials at early ages : Influence of initial temperature, curing stress and drainage conditions" 125 : 553-563, 2016

26 Belem, T., "Measurement and prediction of internal stresses in an underground opening during its filling with cemented fill" 28-30, 2004

27 Doherty, J. P., "Investigation of some controllable factors that impact the stress state in cemented paste backfill" 52 (52): 1901-1912, 2015

28 Schindler, A. K., "Influence of supplementary cementing materials on the heat of hydration of concrete" 17-26, 2003

29 Thompson, B., "In-situ measurements of cemented paste backfill in long-hole stopes" 197-198, 2009

30 Thompson, B., "In situ measurements of cemented paste backfill at the Cayeli Mine" 49 (49): 755-772, 2012

31 Hassani, F., "In situ measurements in a paste backfill: Backfill and rock mass response in the context of rockburst" 165-175, 2001

32 Han, F., "Hydration kinetics of composite binder containing fly ash at different temperatures" 124 (124): 1691-1703, 2016

33 Potvin, Y., "Handbook on mine fill" Australian Centre for Geomechanics 2005

34 Williams, T. J., "Geomechanics of reinforced cemented backfill in an underground stope at the Lucky Friday Mine" National Institute for Occupational Safety and Health 2001

35 Fall, M., "Experimental characterization of the stress–strain behaviour of cemented paste backfill in compression" 42 (42): 3914-3922, 2007

36 Fang, K., "Effects of curing temperature on shear behaviour of cemented paste backfill-rock interface" 112 : 184-192, 2018

37 El Mkadmi, N., "Effect of drainage and sequential filling on the behavior of backfill in mine stopes" 51 (51): 1-15, 2013

38 Zhang, Q., "Design and application of solid, dense backfill advanced mining technology with two pre-driving entries" 25 (25): 127-132, 2015

39 Ghirian, A., "Coupled thermo-hydro-mechanical-chemical behaviour of cemented paste backfill in column experiments : Part II : Mechanical, chemical and microstructural processes and characteristics" 170 : 11-23, 2014

40 Fall, M., "Coupled modeling of the strength development and distribution within cemented paste backfill structure" 587-595, 2015

41 Ghirian, A., "Coupled behavior of cemented paste backfill at early ages" 33 (33): 1141-1166, 2015

42 Comsol, "Comsol Multiphysics 5.1"

43 Helinski, M., "Behavior of cemented paste backfill in two mine stopes : Measurements and modeling" 137 (137): 171-182, 2010

44 Cui, L., "An evolutive elasto-plastic model for cemented paste backfill" 71 : 19-29, 2016

45 Veenstra, R., "An approach to stope scale numerical modelling of early age cemented paste backfill" (274)1-(274)7, 2011

46 Cui, L., "A coupled thermo-hydro-mechano-chemical model for cemented tailings backfill" 50 : 396-414, 2015

47 Benzaazoua, M., "A contribution to understanding the hardening process of cemented" 17 (17): 141-152, 2004