Influence of binder content on temperature and internal strain evolution of early age cemented tailings backfill

Hou, Chen; Zhu, Wancheng; Yan, Baoxu; Guan, Kai; Du, Jiafa

doi:10.1016/j.conbuildmat.2018.09.032

Cited by 41 publications

(12 citation statements)

References 41 publications

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“…During the process of tailing sand freezing, the volume change in the positive-frozen tailings sand is influenced by two factors: the water phase becoming ice and water migration 32 . The volume expansion strain 33,34 of the tailings sand can be expressed as:where is the volumetric strain caused by the phase change of ice water in tailings sand, and is the volumetric strain caused by the temperature change.…”

Section: Numerical Simulationmentioning

confidence: 99%

Ageing deformation of tailings dams in seasonally frozen soil areas under freeze-thaw cycles

Jin

Song

et al. 2019

Sci Rep

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The freeze-thaw cycle is one of the important factors in inducing a dam-break in the permafrost region, so it is of great practical significance to study the mechanism of the failure deformation of tailings dams under freeze-thaw cycles. In this paper, the water-heat-force coupling model of a tailings dam considering frost-thaw damage is established, and the freeze-thaw cyclic ageing deformation of a tailings dam in a seasonally frozen soil area is studied. The correctness of the model is validated by numerical calculation. The research shows under the same water content, the compressive strength and modulus of deformation decrease with an increase in the number of freeze-thaw cycles, the cohesion and internal friction angle decrease, and the amplitude gradually decreases before becoming stable. In the process of cooling, the pore water pressure first increases and then decreases, and the pore water pressure first decreases and then increases during the heating process. The research results can provide a theoretical basis and reference values for the stability analysis of tailings dams in seasonally frozen soil areas.

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Section: Numerical Simulationmentioning

confidence: 99%

Ageing deformation of tailings dams in seasonally frozen soil areas under freeze-thaw cycles

Jin

Song

et al. 2019

Sci Rep

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“…Mine backfill has gained increasing popularity in the mining industry all over the world due to the fact that it provides ground support for mining operations, reduces ore dilution, and allows safe disposal of tailings [1][2][3]. Generally, the cemented paste backfill (CPB) is made of complex composite composed of filtered tailings, water, and binders [4] and is transported underground to mine stopes by gravity delivered or pumped through a network of pipelines [5]. e CPB usually uses classified tailings as aggregate leads to a problem of low utilization of tailings.…”

Section: Introductionmentioning

confidence: 99%

“…e uniaxial compressive strength test is most widely used to study the mechanical properties of CPB, which is a simple and economical test method [19]. Numerous previous experimental studies concentrate a lot on the components (tailings, cement, admixture, and water) of CPB mixture which influence the UCS of CPB [2,4,[19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37]. Megan et al [38] investigated that curing with elevated temperature and effective stress can significantly increase the UCS of CPB.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Rheological Properties and Strength Variation of High Concentration Cemented Unclassified Tailings Backfill

Shi-jiao

Xing

et al. 2020

Advances in Materials Science and Engineering

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This experimental study presents the rheological properties and strength characteristics of cemented unclassified tailings backfill (CUTB). The particle size distribution and chemical properties of tailings from the Shizhuyuan lead-zinc mine were examined experimentally. A series of rheological properties and uniaxial compressive strength (UCS) tests were conducted to study the relations between the rheological properties of CUTB and two factors of cement-tailings ratio (c/t) and solid content (SD). The two-factor nonrepetitive analysis of variance (ANOVA) method was used to study the sensitivity of rheological properties to two factors of c/t and SD. Relations between UCS performance of CUTB and c/t, SD, and curing time (CT) were discussed. Results indicate that CUTB samples exhibit obvious shear thinning characteristics and the rheological process is the result of multiple rheological model composites. Yield stress and viscosity of CUTB increase with the increase of SD and c/t as quadratic. The solid content is the most important factor for the rheological properties of CUTB, followed by c/t. UCS of CUTB increases exponentially with the increase of SD and increases with c/t as quadratic. The larger the ratio of c/t, the greater the influence of the CT on the increasing strength of CUTB. The smaller the c/t, the slower the increase of the CUTB’s strength with the increase of the SD. The findings of this study can provide the efficient mix proportion of backfill slurry for the backfill mining design, so as to have better performance of the underground mining structure and reduce the cost of backfill mining.

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“…The determination of the size of the filling body is one of the most critical issues in the mining process, but few related studies have been presented, and these earlier studies mainly concentrated on traditional methods, including ratio experiments and numerical simulation analyses [29][30][31][32][33]. For example, Wu et al [34] chose the uniaxial compressive strength (UCS), slurry slump, and unit C binder consumption as response variables and then optimized the filling ratio of cemented backfill.…”

Section: Introductionmentioning

confidence: 99%

A New Decision Method of Filling Ratio Based on Energy Matching of Surrounding Rock and Backfill

Zhou

Lin

2020

Geofluids

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In order to simplify the ratio decision process of cemented backfill in underground mines and achieve fine decision of filling ratio, the research on the energy matching between surrounding rock and cemented backfill in underground mines was conducted in this study. Based on the cubic function strength model of cemented backfill, the peak specific energy equation of backfill was improved by inversion analysis of the data of filling ratio experiment, and the functional relationship between the peak specific energy and the filling ratio was obtained by regression analysis. Then, based on the energy balance principle between the deformation energy released by the excavation of the underground rock mass and the peak specific energy of the cemented backfill, considering the physical and mechanical parameters of the surrounding rock of the goaf, including bulk density, elastic modulus, and burial depth, a ratio decision model of cemented backfill is established. The application results suggested that the calculation result of the model is reliable, and it can realize the rapid and accurate decision of the ratio of cement backfill in underground mines.

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Influence of binder content on temperature and internal strain evolution of early age cemented tailings backfill

Cited by 41 publications

References 41 publications

Ageing deformation of tailings dams in seasonally frozen soil areas under freeze-thaw cycles

Ageing deformation of tailings dams in seasonally frozen soil areas under freeze-thaw cycles

Experimental Study on Rheological Properties and Strength Variation of High Concentration Cemented Unclassified Tailings Backfill

A New Decision Method of Filling Ratio Based on Energy Matching of Surrounding Rock and Backfill

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