In situ pressures in cemented paste backfill — a review of fieldwork from three mines

Thompson, B. D.; Grabinsky, Murray; Veenstra, Ryan; Bawden, W.F.

doi:10.36487/acg_rep/1104_42_thompson

Cited by 13 publications

(5 citation statements)

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“…In the last decade there have been several large instrumentation programs undertaken to study the in situ behaviour of CPB within a series of test stopes (Grabinsky et al 2008;Thompson et al 2011;Hasan et al 2014). The instrumentation in these studies varied but almost all the instrumentation clusters included the use of three total earth pressure cells (TEPCs) and a piezometer (PZ).…”

Section: Field Instrumentationmentioning

confidence: 99%

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Early curing age paste backfill exposures – the role of effective stress

Veenstra¹,

Grice²,

Grabinsky³

et al. 2015

Proceedings of the 18th International Seminar on Paste and Thickened Tailings

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This paper presents results from a numerical modelling exercise that looks at vertically exposing sub-28-day cemented paste backfill. The reason for this exercise is that underground mining operations would like to start exposing cemented paste backfill (CPB) earlier in order to increase production. However, these earlier exposures would mean that the pore water pressures in the stope may not have fully dissipated, hence entering an effective stress state versus a total stress state. The goal of this paper was to examine how effective stress impacts these early exposures. This was done by modelling the filling and the subsequent pore water dissipation within a stope. This modelled CPB was then vertically exposed, using both effective and total stress models, at various times ranging from immediately after filling to 28 days after filling. The results of these models were then compared in order to determine what difference there was between the overall outcome.

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Section: Field Instrumentationmentioning

confidence: 99%

“…Figure 1 contains three photographs of a typical instrumentation cluster installation in the University of Toronto (UofT) test stopes. Refer to Thompson et al (2011) for more details about the UofT in situ instrumentation. Instrumentation from three different UofT test stopes are analysed in this paper.…”

Section: Field Instrumentationmentioning

confidence: 99%

Early curing age paste backfill exposures – the role of effective stress

Veenstra¹,

Grice²,

Grabinsky³

et al. 2015

Proceedings of the 18th International Seminar on Paste and Thickened Tailings

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“…The inclusion of both the TEPCs and a piezometer meant that the effective stress of the CPB can be calculated at those locations. Figure 1 shows instrumentation results from three different stopes each from a different mine site (Thompson et al 2011). Figures 1(a) and (b) each show results from instrumentation points located in the middle of the body of the stope at about 2 m elevation, while Figure 1(c) shows the results of two instrumentation points, both from the middle of the stope however the first at 2 m elevation and second at about 6 m elevation.…”

Section: Stope Instrumentationmentioning

confidence: 99%

A numerical analysis of how permeability affects the development of pore water pressure in early age cemented paste backfill in a backfilled stope

Veenstra¹,

Grabinsky²,

Bawden³

et al. 2014

Proceedings of the Eleventh International Symposium on Mining With Backfill

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This paper examines the behaviour of cemented paste backfill in the top part of the paste column. The paste within this section tends to exhibit isotropic behaviour and behaves more like a fluid than a solid. This trend will be examined using in situ instrumentation data obtained from test stopes. This behaviour in this isotropic zone tends to be determined by consolidation properties as opposed to strength properties. In order to examine this behaviour three models were run. Two using a fixed permeability curve and the third using a function that determines the consolidation parameters as a function of curing age and applied stress. A comparison of these results will help determine how the paste is behaving at these early curing ages.

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“…These studies focus on the characteristics and key technical issues of backfill technology. These research results promote the development of backfill technology worldwide [10][11][12]. For the large-scale filling of goaf, the research and application of filling technology in George Fisher Mine (Mount Isa, Australia) in north central Australia is representative.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Lead-Smelting Slag as Paste Filling Cementing Material

2022

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Under the current pressure of mineral product price and market competition, as well as the tightening of ecological and environmental protection policies, energy saving, emission reduction and cost reduction, and efficiency increase have become inevitable trends. Lead-smelting slag of smelter, as an industrial byproduct, is harmful solid waste to be eliminated. In this research, a series of experiments on substitute for cement were done for filling cost reduction under premise of guaranteeing the filling strength, using PC32.5 cement as reference cementing material. Meanwhile, with Portland cement clinker, water quenching slag of BF ironmaking, and lead-smelting slag of smelter in different ratios, four cementing materials were made and named as cementing material I, cementing material II, cementing material III, and cementing material IV. Then, the above five cementing materials including PC32.5 cement were mixed, respectively, with tailing and water to prepare paste backfill slurry with different binder-tailing ratio and concentration. Backfill block was made and cured at 20°C; their uniaxial compressive strengths in different curing ages were measured. The result shows the strength of backfill test block using cementing material I (cement clinker and water quenching slag) without lead-smelting slag is far higher than that of test block using PC32.5 cement as cementing material. The strength of block with 16% lead-smelting slag increased dramatically, which was higher than the strength of block using PC32.5 as cementing material. However, the strength of test block decreased when the content of lead-smelting slag reached 32% and 40%. The more lead-smelting slag was added, the worse influence on strength of backfill would be. Because of large specific gravity of lead-smelting slag and low content of CaO, the hydration activity of lead-smelting slag is far lower than that of water quenching slag. Therefore, using moderate lead-smelting slag as substitute for cement will lead to increase of backfill strength and decrease filling cost.

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In situ pressures in cemented paste backfill — a review of fieldwork from three mines

Cited by 13 publications

References 0 publications

Early curing age paste backfill exposures – the role of effective stress

Early curing age paste backfill exposures – the role of effective stress

A numerical analysis of how permeability affects the development of pore water pressure in early age cemented paste backfill in a backfilled stope

Experimental Study on Lead-Smelting Slag as Paste Filling Cementing Material

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