Geotechnical considerations in mine backfilling in Australia

Sivakugan, Nagaratnam; Rankine, Rudd; Rankine, K.J.; Rankine, Kirralee

doi:10.1016/j.jclepro.2004.06.007

Cited by 156 publications

(72 citation statements)

References 3 publications

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“…Meanwhile, massive tailings generated from mineral processing have been deposited into more than 3000 tailings dams (ponds) without any further steps due to its low cost [4,5]. However, this method of disposal entails geological (e.g., tailings dam failures) and environmental (e.g., acid mine drainage, heavy metal leaching and groundwater pollution) hazards [6][7][8]. For example, a tailings dam located in Shanxi province, China collapsed in 2008, causing 277 casualties and direct economic losses of $14.59 million.…”

Section: Introductionmentioning

confidence: 99%

Use of Cemented Super-Fine Unclassified Tailings Backfill for Control of Subsidence

et al. 2017

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Known for its advantages in preventing geological and environmental hazards, cemented paste backfill (CPB) has become a topic of interest for scientists and mining engineers in recent decades. This paper presents the results of a study on the use of cemented super-fine tailings backfill (CSUTB) in an underground mine for control of surface subsidence. An analytical solution is developed based on the available model to calculate the required strength of backfill when in contact with non-cemented tailings (NCT). The effect of solid contents on the rheological properties of CSUTB is investigated. A reasonable mix proportion (RMP) of CSUTB is determined for Zhongguan Iron Mine (ZGIM) based on laboratory experiments. The validity of RMP in surface subsidence control is verified by a 3D numerical model. The obtained results show that CSUTB requires higher strength when in contact with NCT than when in contact with orebody. Rheological characteristics, e.g., slump, fluidity, and bleeding rate of fresh CSUTB, decrease with higher solids content, of which values with a certain solids content can be determined by quadratic polynomial regression equations. RMP with a cement to tailings (c/t) ratio of 1:10 and a solids content of 70% is recommended for ZGIM, as it shows favorable mechanical and rheological abilities. The deformation parameters (curvature, inclination, and horizontal deformation rate) obtained from numerical modeling are acceptable and lower than critical values, meaning CSUTB can feasibly be used with RMP in subsidence control.

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Section: Introductionmentioning

confidence: 99%

Use of Cemented Super-Fine Unclassified Tailings Backfill for Control of Subsidence

et al. 2017

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“…The use of cemented paste backfill is an increasingly important component of underground mining operations and is becoming a standard practice for use in many cut-and-fill mines around the world [1]. This is an effective means of tailing disposal because it negates the need for constructing large tailing dams at the surface [2].…”

Section: Introductionmentioning

confidence: 99%

Soil-Structure Interface Behavior of Cemented-Paste Backfill Material Mixed With Mining Waste

Adajar¹

2018

GEOMATE

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ABSTRACT:The use of mining wastes as a component of cemented paste backfill provides an environmentally acceptable method of waste disposal at a lesser cost as the method does not require tailing dams for storing the large volume of wastes. This study determines the applicability of cemented-paste backfill materials mixed with aggregate quarry wastes as ground support to concrete structures. Aggregate quarry waste with varying fine contents was used as a substitute for sand in cemented-paste backfill and the mixture was referred to as cemented-paste tailing backfill (CPTB). Its micro fabric structure was determined through SEM-EDX tests. Test results showed that CPTB with 20% and 40% fine contents has acceptable values of strength properties in terms of its unconfined compressive strength and interface friction angle. The unconfined compressive strength in relation to its curing period is in the range of 120 kPa to 150 kPa which can be described as having stiff consistency. The stress-strain interface behavior between CPTB and concrete structure was evaluated through a direct shear test using strain rates that simulate the rapid and slow rates of loading. In both conditions, the stress-strain behavior exhibits strain softening. The average interface friction angle is 38 o which can be associated with its dense condition. The modified hyperbolic model was applied to evaluate the soil-structure interface behavior of CPTB. Hyperbolic parameters were formulated to predict the interface shear stress -shear strain behavior of the CPTB when in contact with concretes structure at any value of shear strain and normal effective stress.

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“…As the study of the backfilling method goes deeper and its application goes wider [16][17][18][19], the integrated technique of underground gangue washing-discharging-backfilling has been applied to cut the cost of gangue lifting and reduce the potential environmental impact caused by gangue dumping and spontaneous combustion.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Overlying Strata Movement and Behaviors in Caving and Solid Backfilling Mixed Coal Mining

et al. 2017

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Based on techniques of close upper protective coal-rock layer mining, relieved gas extraction, and underground gangue washing-discharging-backfilling, this paper initiates the concept of mixed fully-mechanized coal mining, which combines a solid backfilling method and a caving method (hereinafter referred to as "backfill and caving mixed mining"). After the principle and key techniques are introduced, a physical simulation experiment and a numerical simulation are used to study the characteristics of the overlying strata's fracture development, the main roof subsidence, the stress field and its influence area in the transition area with the length ratios of the backfilling section and the caving section, and the advancing distance of the mixed longwall face. Thus, the lengths of the caving section and the backfilling section, the parameters of the support system in the transition section, and the design process of the mixed longwall face are presented. In practice, the mixed longwall face Ji 15 -31010 in Ping-dingshan No. 12 Colliery proves that the designed lengths of 120 m and 100 m for the backfilling section and the caving section, respectively, are appropriate. The monitoring results of the hydraulic support working resistance show that the supports were working well in general; the maximum growth height of the overlying strata fracture is 18 m; the gas drainage efficiency is up to 80% and the average gas concentration is 0.1 g/m 3 ; a large quantity of gangue generated in the Ji 14 seam is disposed underground; coal and gas are extracted simultaneously; and significant environmental and economic benefits are realized.

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Geotechnical considerations in mine backfilling in Australia

Cited by 156 publications

References 3 publications

Use of Cemented Super-Fine Unclassified Tailings Backfill for Control of Subsidence

Use of Cemented Super-Fine Unclassified Tailings Backfill for Control of Subsidence

Soil-Structure Interface Behavior of Cemented-Paste Backfill Material Mixed With Mining Waste

Analysis of Overlying Strata Movement and Behaviors in Caving and Solid Backfilling Mixed Coal Mining

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