Effects of curing and stress conditions on hydromechanical, geotechnical and geochemical properties of cemented paste backfill

Yilmaz, Erol; Belem, Tikou; Benzaazoua, Mostafa

doi:10.1016/j.enggeo.2013.10.024

Cited by 170 publications

(49 citation statements)

References 40 publications

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“…Owing to that, one way of managing the mine waste is through cemented backfill, which is a mixture of tailings, water and cement or binding agents (Grice 1998, Benzaazoua et al 1999, 2004, Belem et al 2000, Aubertin et al 2002, Yilmaz et al 2009, Abdul-Hussain & Fall 2011, Tariq & Yanful 2014, Mashoene & Zvarivadza 2016. The primary role of paste backfill is it assists in ground control (Benzaazoua et al 1999, De Souza et al 2003, Belem & Benzaazoua 2008, Belem et al 2005, Yilmaz et al 2014 by playing the role of secondary mine support. The secondary role of underground paste backfill is to reduce the environmental impacts of mining activities by reducing the number of tailings to be stored in tailings storage facilities (Grice and Street 1998, Aubertin et al 2002, Yilmaz et al 2009, Abdul-Hussain & Fall 2011, Tariq & Yanful, 2014.…”

Section: Introduction / Backgroundmentioning

confidence: 99%

Evaluating the Strength and Performance of Backfill Support in Deep Level Gold Mines

Sengani

Zvarivadza

Netshithuthuni

2018

IJGE

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Abstract:The backfill operations at the deep level gold mine consist of a Cyclone Classified Tailings (CCT) Plant as well as a Full Plant Tailings (FPT) Plant with both producing cemented backfill. Due to the high demand of backfill at the mine, including a backlog of voids that need to be filled, both the CCT and FPT Plants are being operated at the moment. The mine will require an increased capacity of backfill going forward, with monthly throughputs in the order of 200 000 to 250 000 tonnes being required. The current mining methods includes destress cuts, long hole stoping as well as drift and fill mining with cemented backfill as a support medium. These concerns have led to the review of the entire backfill operations of the mine with a need for optimising, reducing costs and reducing operational complexity going forward. The research provides strength test work (solids density, particle size distribution, slurry pH, temperature, conductivity, freely settled bed packing concentration, permeability, particle micrographs, water quality, mineralogy, boger slump tests, cement mortar tests (ISO bars), and unconfined compressive strength (UCS) tests) and audit the current backfill operations at the mine. The data showed that both materials had similar top particle sizes of approximately 500 μm. The CCT has a d30 and d10 of 63.4 and 18.2 μm, respectively, compared to the FPT with a d30 and d10 of 13.1 and 3.1, respectively, which is significantly finer. The freely settled bed packing concentration by volume was calculated from the volume of the freely settled bed formed by a known volume of solids. A slurry sample was allowed to settle for 24 hours in a measuring flask. The actual solids volume was determined from the dry mass of material and the solids density. The results were as follows: CCT 45.2 %v (69.1 %m) and FPT 40.0 %v (63.8 %m).

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Section: Introduction / Backgroundmentioning

confidence: 99%

Evaluating the Strength and Performance of Backfill Support in Deep Level Gold Mines

Sengani

Zvarivadza

Netshithuthuni

2018

IJGE

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“…Another attractive aspect is that the materials usually used in backfill mining are tailings or coal gangue, which are generated during ore or coal processing in plants. The disposal and treatment of these mining waste products can be a serious problem in many countries as these products can cause environmental issues [4][5][6][7][8][9]. Cemented paste backfill (CPB) is a widely used backfilling method that can significantly improve mining stopes stability in underground hard rock mines, or reduce surface subsidence in underground coal mines [10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Investigation of Hydraulic-Mechanical Properties of Paste Backfill Containing Coal Gangue-Fly Ash and Its Application in an Underground Coal Mine

et al. 2017

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Abstract:Backfilling is widely used to control surface subsidence and stope stability to improve pillar recovery. Furthermore, it is also an effective way to process and dispose of mining waste such as coal gangue and tailings. In this study, the hydraulic-mechanical properties of cemented paste backfill materials (CPB) were investigated. Twenty-eight cemented coal gangue-fly ash backfill mixtures were prepared with different water, cement, fly ash and coal gangue content and the slump, segregation and water bleeding ratio tests were conducted. Increasing fly ash content increased the slump value and decreased the segregation value of the slurry. The uniaxial compressive strength (UCS) of the cemented coal gangue-fly ash backfill samples were tested at different curing times. Based on the test results, an optimized recipe was used for the field trial. Longwall cut and backfilling mining method was used in the 2300 mining district to recycle the coal pillar between longwall 2301 and 2302. Both stress and displacement meters were installed in the goaf and their performance was monitored continuously. An increase in stress and displacement values were observed to occur with the working face advanced (up to 325 m and 375 m, respectively); thereafter, a trend of stabilization was observed. The monitoring results suggest that the backfills can efficiently control the roof movement and surface subsidence as well as improve pillar recovery.

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“…Currently, cemented past backfill (CPB), which is made of mill tailings generated by the mineral processing plant, a binding agent such as ordinary Portland cement (OPC), water and other additives, is the most frequently used filling material due to its economic, environmental and technical benefits [10][11][12][13][14][15]. The CPB usually acts as artificial pillar and plays a key role in supporting surrounding rocks.…”

Section: Introductionmentioning

confidence: 99%

Strength Characteristics and Failure Mechanism of Cemented Super-Fine Unclassified Tailings Backfill

et al. 2017

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This experimental study investigates the strength characteristics of cemented super-fine unclassified tailings backfill (CSUTB) and its failure mechanism. Physical and chemical properties of tailings from the Zhongguan Iron Mine (ZGIM) were tested. A series of uniaxial compressive strength (UCS) tests was conducted to determine the relationships between UCS of CSUTB and three factors of cement-tailings ratio (CTR), solid content and curing time. Gray relational analysis (GRA) method was then used to study the sensitivity of UCS to these three factors. Results indicate that ZGIM unclassified tailings is a kind of alkaline super-fine tailings with high activity and quality. UCS of CSUTB increases exponentially with the increase of CTR and solid content, and increases linearly with curing time. The curing time is the most important factor for the UCS of CSUTB, followed by CTR and solid content. The stress-strain curves obtained from UCS tests show the failure process of CSUTB, including four stages of initial deformation, linear elastic, yield deformation and complete failure. It is the result of damage evolution.

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Effects of curing and stress conditions on hydromechanical, geotechnical and geochemical properties of cemented paste backfill

Cited by 170 publications

References 40 publications

Evaluating the Strength and Performance of Backfill Support in Deep Level Gold Mines

Evaluating the Strength and Performance of Backfill Support in Deep Level Gold Mines

Investigation of Hydraulic-Mechanical Properties of Paste Backfill Containing Coal Gangue-Fly Ash and Its Application in an Underground Coal Mine

Strength Characteristics and Failure Mechanism of Cemented Super-Fine Unclassified Tailings Backfill

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