Compressive behaviour of fibre-reinforced cemented paste backfill

Yi, Xiawei; Ma, Guowei; Fourie, Andy

doi:10.1016/j.geotexmem.2015.03.003

Cited by 136 publications

(51 citation statements)

References 31 publications

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“…In China, generally, the tailings coming out of the ore treatment plant (with solid content of about 20%-30%) is transported to the tailings stock bin of the lling plant [17]. Coarse tailings (i.e., classi ed tailings) is released from the bottom of the stock bin (with the solid concentration of about 75%) and mixed with the binder or piled up in open spaces (with the solid content up to 90%) and then mixed with the binder and right amount of water, used for mining lling.…”

Section: Introductionmentioning

confidence: 99%

Study on the Strength Development of Cemented Backfill Body from Lead‐Zinc Mine Tailings with Sulphide

Zheng

Guo

Sun

et al. 2018

Advances in Materials Science and Engineering

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e unconfined compressive strength (UCS) development of cemented backfill materials for lead-zinc mine tailings with sulphide was studied. e results showed that the UCS of the cemented backfill body with ordinary Portland cement (OPC) as binder decreased in the later curing days, regardless of particle size. Under the same conditions, the higher the OPC content, the higher the UCS of the cemented backfill body, and the UCS of the cemented backfill body began to decrease at the longer curing days. Under the same conditions, the finer the tailings, the lower the UCS of the cemented backfill body at each age, and the UCS of the cemented backfill body began to decrease at the earlier curing age. X-ray diffraction analysis (XRD) showed that the reduction of the UCS of the cemented backfill body was related to the formation of an expansive substance (expansive gypsum) in the cemented backfill body, which led to the cracking of the test sample. In the cemented backfill materials of coarse tailings of lead-zinc mine, the composite binder formed by OPC and calcined kaolin (CK) containing metakaolin was used; the amount of calcium hydroxide, the hydration product of cement, was reduced or eliminated due to the pozzolanic reaction of metakaolin; and the amount of expansive gypsum was reduced or eliminated, so the UCS of the cemented backfill body increased within 360 days of curing.

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Section: Introductionmentioning

confidence: 99%

Study on the Strength Development of Cemented Backfill Body from Lead‐Zinc Mine Tailings with Sulphide

Zheng

Guo

Sun

et al. 2018

Advances in Materials Science and Engineering

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“…Yi et al [17] conducted uniaxial compressive tests on fiber-reinforced CPB and observed the increase in UCS and ductility of CPB with more fibers. Zhen et al [18] studied coupled effect of limestone powder (LP) and water-reducing admixture (WRA) on the CPB properties, and reported that incorporation of LP and WRA increased the UCS of CPB.…”

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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“…When a cylindrical sample of cemented backfill is axially loaded to failure, several modes of failure can be observed, including diagonal shear ( Figure 1a) [24][25][26][27], 'X' cone-shear ( Figure 1b) [28,29], single (or columnar) split (Figure 1c) [24,26,[29][30][31][32], and 'Y' cone-split ( Figure 1d) [24,27,32]. Similar failure modes have equally been observed in uniaxial compression tests with concrete or cemented soils [33,34].…”

Section: Introductionmentioning

confidence: 99%

An Investigation of the Uniaxial Compressive Strength of a Cemented Hydraulic Backfill Made of Alluvial Sand

Liu

Yao³

et al. 2017

Minerals

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Abstract:Backfill is commonly used in underground mines. The quality control of the backfill is a key step to ensure it meets the designed strength requirement. This is done through sample collection from the underground environment, followed by uniaxial compression tests to obtain the Uniaxial Compressive Strength (UCS) in the laboratory. When the cylindrical cemented backfill samples are axially loaded to failure, several failure modes can be observed and mainly classified into diagonal shear failure and axial split failure. To date, the UCS obtained by these two failure modes are considered to be the same with no distinction between them. In this paper, an analysis of the UCS results obtained on a cemented hydraulic backfill made of alluvial sand at a Canadian underground mine over the course of more than three years is presented. The results show that the UCS values obtained by diagonal shear failure are generally higher than those obtained by axial split failure for samples with the same recipe and curing time. This highlights the importance of making a distinction between the UCS values obtained by the two different modes of failure. Their difference in failure mechanism is explained. Further investigations on the sources of the data dispersion tend to indicate that the UCS obtained by laboratory tests following the current practice may not be representative of the in-situ strength distribution in the underground stopes due to segregation in cemented hydraulic backfill.

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Compressive behaviour of fibre-reinforced cemented paste backfill

Cited by 136 publications

References 31 publications

Study on the Strength Development of Cemented Backfill Body from Lead‐Zinc Mine Tailings with Sulphide

Study on the Strength Development of Cemented Backfill Body from Lead‐Zinc Mine Tailings with Sulphide

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

An Investigation of the Uniaxial Compressive Strength of a Cemented Hydraulic Backfill Made of Alluvial Sand

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