An analytical solution to estimate the settlement of tailings or backfill slurry by considering the sedimentation and consolidation

Qin, Jiahao; Zheng, Jian; Li, Li

doi:10.1016/j.ijmst.2021.02.004

Cited by 34 publications

(7 citation statements)

References 39 publications

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“…The tailings used in our experiment are fine-grained tailings produced from gold beneficiation, so their mechanical properties differ from those of coarse tailings. (Agapito and Bareither, 2018), (Qin et al, 2021), and (Islam, 2021). investigated the mechanical properties of fine tailings or backfill slurry and drew conclusions on the shear, seepage, and consolidation properties of fine tailings.…”

Section: Figurementioning

confidence: 99%

Experimental study of triaxial shear features of concentrated full tailings considering the effect of curing age

et al. 2023

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The strength evolution law of concentrated full tailings is closely related to the storage construction method, especially the growth law of shear strength with curing age. This study aims to investigate the influence of curing materials on the shear strength of full tailings and reveal the change law of the shear strength of concentrated full tailings with the curing age. Therefore, we carried out a comparative triaxial shear test between pure full tailings and concentrated full tailings with different curing ages. The test results show that concentrated full tailings had a 70.7% higher cohesion and a 10% larger internal friction angle (IFA) than that of pure full tailings at the age of 0 days. Moreover, the concentrated full tailings cured for 3 days had a 170.2% higher cohesion and a 12.1% larger IFA than that cured for 0 days. In addition, the concentrated full tailings cured for 7 days had a 149.4% higher cohesion and a 12.1% larger IFA than that cured for 0 days. The stress-strain curve exhibits that the shear strength of full tailings is significantly influenced by the curing material and curing age. The stress-strain curve gradually moved from strain hardening to strain softening as the curing age increased, and the failure curve had two steps. This indicates that the specimen still has a certain shear capacity despite having a shear zone. The entire specimen instantly fails when the strain exceeds that capacity. The results of this study can be used as scientific bases for the design and construction of the surface storage structures of concentrated full tailings.

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Section: Figurementioning

confidence: 99%

Experimental study of triaxial shear features of concentrated full tailings considering the effect of curing age

et al. 2023

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“…Under consolidation, the general behavior of areas containing finegrained tailings with high water content is similar to the response of soft grounds [33]. Hence, deposited slurry tailings encounter significant settlements under particles' self-weight in the long term [34][35][36][37]. Appropriate management of the deposition rate and adopting a suitable drainage system can prevent tailings dam failure.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, the use of ground improvement techniques for accelerating settlements or dewatering tailings compatible with project conditions is essential. For instance, the surcharge loading method for the control of settlements for lowly consolidated areas with soft uranium tailings [36], electro-osmosis method for dewatering mineral tailings (e.g., leach residue and gypsum [38]; copper sulfide tailings [39]; iron ore tailings [40]; alumina tailings [41]), and vacuum consolidation in order to manage settlements (e.g., soda ash tailings [42]; oil sands tailings [43]; fine copper tailings [44]).…”

Section: Introductionmentioning

confidence: 99%

A comprehensive study on the effects of initial water content, suction magnitude, and drainage zone size on self-weight consolidation and vacuum preloading of soft soils and slurried mine tailings

Ahmadi,

Bazaz

2024

Preprint

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The self-weight consolidation of deposits consisting of fine-grained materials takes a long time. Using a suitable improvement method such as vacuum preloading can accelerate the consolidation. The first innovation is to experimentally assess the vacuum preloading effectiveness for expediting the settlement process of slurry tailings from the Sungun copper mine located in Iran. A new laboratory set-up is configured for radial and vertical consolidations of slurry samples. Effects of initial water content, suction level, and drainage zone size (i.e., sample relative size and vertical drain dimensions) on the tailings consolidation are evaluated through 272 tests. Previous studies indicate that analytical and numerical approaches are limited to particular assumptions and yield correct predictions only if various parameters during consolidation can be accurately determined. Therefore, as the second novelty, new empirical correlations are derived based on a modified multiple linear regression to simply predict vertical strain versus time curves under self-weight and vacuum consolidations with high accuracy. The data required for the statistical analysis are collected from the experimental results of Sungun tailings and a set of previous studies with a wide range of input values. The formulas proposed in this research are verified through several past in-situ and experimental studies with errors of less than 9%.

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“…However, almost all publications on mining backfill have focused on the behaviour of a single type of backfill, including the extensive works conducted by Li and co-workers over the past two decades (Aubertin et al 2003;Béket Dalcé et al 2019;El Mkadmi et al 2014;Jaouhar et al 2018;Jaouhar & Li 2019;Keita et al 2021aKeita et al , 2021bLi et al 2003;Li et al 2005;Li & Aubertin 2012;Li 2014aLi , 2014bLiu et al 2017aLiu et al , 2017bLiu et al , 2018Pagé et al 2019;Qin et al 2021aQin et al , 2021bWang et al 2021aWang et al , 2021bWang & Li 2022;Yang et al 2017Yang et al , 2018Zhai et al 2021;Zheng et al 2019Zheng et al , 2020aZheng et al , 2020bZheng et al , 2020c. Research on the natural mixing behaviour between the waste rocks and paste backfill is absent in the literature.…”

Section: Introductionmentioning

confidence: 99%

Natural mixing behaviour of waste rocks poured in a paste backfill

Zhang¹,

Li²

2023

Paste 2023: 25th International Conference on Paste, Thickened and Filtered Tailings

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In underground mines, large quantities of waste rock can be produced during development in order to access ore bodies. The waste rock is typically hoisted to the surface and transported to a specific place to make a structure called a waste rock pile. This practice requires energy consumption and generates additional operating costs for transporting waste rock from underground to the surface. Alternatively, the waste rock can be poured directly into underground mine stopes filled with paste backfill. As a result, energy consumption and additional operating costs for transporting the waste rock from underground to the surface are avoided or significantly reduced. However, the natural mixing behaviour of waste rocks poured in paste backfill has never been studied. The fill mass generated by this practice can fail and collapse upon a side-exposure associated with the excavation of an adjacent stope if a poor mixture between the cohesionless waste rocks and cemented paste backfill takes place around the exposed face. Thus, it is critical to understand the mixing behaviour of waste rocks poured in paste backfill. To this end, a series of physical model tests have been performed in the laboratory. The results, in part, are presented and discussed in this paper.

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An analytical solution to estimate the settlement of tailings or backfill slurry by considering the sedimentation and consolidation

Cited by 34 publications

References 39 publications

Experimental study of triaxial shear features of concentrated full tailings considering the effect of curing age

Experimental study of triaxial shear features of concentrated full tailings considering the effect of curing age

A comprehensive study on the effects of initial water content, suction magnitude, and drainage zone size on self-weight consolidation and vacuum preloading of soft soils and slurried mine tailings

Natural mixing behaviour of waste rocks poured in a paste backfill

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