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

Qiu, Jingping; Yang, Lei; Sun, Xiaogang; Jin, Xing; Li, Songbo

doi:10.3390/min7040058

Cited by 50 publications

(23 citation statements)

References 37 publications

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“…Mechanical properties, i.e., uniaxial compressive strength with different c/t ratios, solids contents, and curing ages, of CSUTB of ZGIM have been reported in a previous paper [28], and it can be noted that backfill with 1:10 c/t had a strength between 0.83 and 0.94 MPa, higher than the required strength (0.82 MPa). That is, a c/t of 1:10 could meet the strength requirement of ZGIM.…”

Section: Reasonable MIX Design Of Csutb For Zgim Via Laboratory Testsmentioning

confidence: 99%

“…The mineralogical analysis of tailings was performed via WDX400 X-ray Fluorescence (XRF, Skyray, Suzhou, China) Spectrometer and the result is given in Table 3. The main minerals in the sample are CaO (44.41%), SiO 2 (20.91%), Fe 2 O 3 (16.39%), and MgO (11.30%), indicating the high quality and activity of tailings [28]. Ordinary Portland cement (OPC) was chosen as the binder in this study.…”

Section: Tailingsmentioning

confidence: 99%

“…UCS of CSUTB of ZGIM at given times has been successfully investigated in a previous study [28], whereas the rheological properties of CSUTB are not clear. Meanwhile, a reasonable mix proportion (RMP) of backfill for ZGIM needs to be determined to reduce mining costs and meet the strength requirement of mining.…”

Section: Introductionmentioning

confidence: 99%

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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: Reasonable MIX Design Of Csutb For Zgim Via Laboratory Testsmentioning

confidence: 99%

Section: Tailingsmentioning

confidence: 99%

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

et al. 2017

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“…Backfilling mine wastes into stopes has become a common practice in underground mines worldwide [1][2][3]. The stress state in backfilled stopes is critical for the design of mine backfill and its retaining structures [4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Stress Ratios in Entire Mine Stopes with Cohesionless Backfill: A Numerical Study

Yang

Aubertin

2017

Minerals

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Evaluation of stress states in backfilled mine stopes (or similar openings), using arching theory, can be largely impacted by the value selected for the earth pressure coefficient, K = σ h /σ v . Recently, the current study's authors addressed the debate about the value of K near the opening center, based on Rankine's active coefficient (K a ) and at-rest coefficient (K 0 ). Here, stress ratios in vertical backfilled stopes are numerically assessed (in two dimension, 2D), considering both the independent and related backfill internal friction angle (ϕ ) and Poisson's ratio (ν). Emphasis is placed on the backfill state near stope walls, where local rotation of stresses occurs, so the coefficient (K) and principal stress ratio, K ps (= σ 3 /σ 1 ), should be distinguished. Parametric analyses indicate that values of K and K ps depend on the position and the relationship between ϕ and ν. Near the opening center, K (= K ps ) is close to K a when ν or ϕ is below a critical value; otherwise the value approaches K 0 , defined from ν. Near both walls, K ps is always close to K a , while K is near K 0 for related ν − ϕ cases and depends on their respective values for independent ν and ϕ . Additional simulations conducted with interface elements indicate that the stress ratios near the opening center line are insensitive to interface roughness and are almost identical to values obtained without interfaces, but the stress ratios near walls may change for less rough or smooth interfaces.

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“…However, the tailings are abundant in argillaceous minerals such as biotite and chlorite, owing to the highly oxidized and argillized nature of low-grade ores [2]. As a result, the high-mud content in SUT, the high viscosity of CPB, and its poor fluidity lead to its difficult pipeline transportation, restricting the application and promotion of CPB [3].…”

Section: Introductionmentioning

confidence: 99%

Utilization of Foaming Technology in Cemented Paste Backfill of High-Mud Superfine Unclassified Tailings

Zhao

Wang

Peng

et al. 2017

Advances in Materials Science and Engineering

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Due to high-mud content in superfine unclassified tailings (SUT), the viscosity of cemented paste backfill (CPB) is high and its pipeline transportation properties are poor. Foaming technology was introduced to prepare a new three-phase flow backfill (TFB) using a foaming machine. Then the rheological parameters of TFB with different bubble ratio were measured and their pipeline transportation properties were simulated by Fluent. Besides, the simulation results were further verified by a semi-industrial loop test. The results indicate that the optimum ratio of TFB is a cement-sand ratio of 1 : 8, mass concentration of 70%, and bubble ratio of 20%. Compared with CPB, the decrease of bleeding rate, viscosity, and resistance loss of TFB is 27%, 25%, and 30%, respectively. Therefore, foaming technology is an innovative and feasible solution for high-mud CPB in reducing viscosity, decreasing resistance loss, and improving pipeline transporting efficiency.

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

Cited by 50 publications

References 37 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

Stress Ratios in Entire Mine Stopes with Cohesionless Backfill: A Numerical Study

Utilization of Foaming Technology in Cemented Paste Backfill of High-Mud Superfine Unclassified Tailings

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