Cross-scale characteristics of backfill material using NMR and fractal theory

Hu, Jianhua; Ren, Qifan; Yang, Dongjie; Ma, Shengli; Shang, Junlong; Ding, Xiaotian; Luo, Zhihua

doi:10.1016/s1003-6326(20)65301-8

Cited by 43 publications

(16 citation statements)

References 30 publications

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“…An NM-60 NMR instrument (Suzhou Niumag Analytical Instrument Corporation, Suzhou, China) was applied to perform the NMR test on CTB specimens, and the distribution of transverse relaxation time (T2) of CTB specimens can be obtained. The NMR test detail parameters refer to literatures (Gao et al, 2020;Hu et al, 2020;Wang et al, 2021b).…”

Section: Nmr Testmentioning

confidence: 99%

Mechanical Properties and Microstructure Evolution of Cemented Tailings Backfill Under Seepage Pressure

Shen

Chen

et al. 2022

Front. Mater.

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Cemented tailing backfill (CTB) in underground mine inevitably experiences seepage field, which complicates its mechanical behavior. In this study, the mechanical properties and microstructure characteristics of CTB under different seepage water pressures (SWPs) were investigated. The results show that, with the increase in SWP, the mechanical properties of CTB decrease, but the decreasing trend reduces gradually. Higher SWP leads the microstructure of CTB looser and more porous, and the largest proportion of pores initiated and propagated by SWP is micropores, which means the damage in CTB under seepage is mostly caused by micropores. Besides, the mechanical properties of CTB under seepage decrease exponentially with the increase in porosity and present linearly inverse proportional relation to the pore area fractal dimension. Results above indicate that SWP has a significant deterioration effect on the mechanical properties and microstructure of CTB. The research could not only extend the knowledge of mechanical properties and microstructure characteristics of CTB under seepage but also provide a theoretical reference for mechanical index determination and stability analysis of CTB in water-rich underground mines.

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Section: Nmr Testmentioning

confidence: 99%

Mechanical Properties and Microstructure Evolution of Cemented Tailings Backfill Under Seepage Pressure

Shen

Chen

et al. 2022

Front. Mater.

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“…With the development of fractal theory, it has been widely used in the field of porous materials pore structure complexity and irregular characterization [25][26][27]. Hu [28] studied and analyzed the relationship among the pore structure, fractal dimension and strength of the stone silt tailings backfill. Qing [29] analyzed the relationship among pore fractal dimension, compressive strength and permeability of wollastonite concrete by mercury pressing test and electron microscope scanning test.…”

Section: Introductionmentioning

confidence: 99%

Research on Strength Prediction Model of Sand-like Material Based on Nuclear Magnetic Resonance and Fractal Theory

Deng

Tian

et al. 2020

Applied Sciences

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Micro-pore structure has a decisive effect on the physical and mechanical properties of porous materials. To further improve the composition of rock-like materials, the internal relationship between microscopic characteristics (porosity, pore size distribution) and macroscopic mechanical properties of materials needs to be studied. This study selects portland cement, quartz sand, silica fume, and water-reducing agent as raw materials to simulate sandstone. Based on the Nuclear magnetic resonance (NMR) theory and fractal theory, the study explores the internal relationship between pore structure and mechanical properties of sandstone-like materials, building a compressive strength prediction model by adopting the proportion of macropores and the dimension of macropore pore size as dependent variables. Test results show that internal pores of the material are mainly macropores, and micropores account for the least. The aperture fractal dimension, the correlation coefficient of mesopores and macropores are quite different from those of micropores. Fractal characteristics of mesopores and macropores are obvious. The macropore pore volume ratio has a good linear correlation with fractal dimension and strength, and it has a higher correlation coefficient with pore volume ratio, pore fractal dimension and other variable factors. The compressive strength increases with the growth of pore size fractal dimension, but decreases with the growth of macropore pore volume ratio. The strength prediction model has a high correlation coefficient, credibility and prediction accuracy, and the predicted strength is basically close to the measured strength.

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“…In the AEACPB sample, porosity embodies the total pore feature; moreover, it has an inevitable connection with strength. Certain studies have reported that there is a certain functional relationship between porosity and strength [19,27]. Now, two techniques are used to obtain the relationships between strength and porosity and pore percentage (Figure 8).…”

Section: Relationship Between Strength and Porosity And Porementioning

confidence: 99%

“…e combination of fractal theory and NMR can be used to study the pore characteristics in the AEACPB, so as to explain the change of strength from the complexity of pores. ere is a certain functional relationship between the fractal dimension D and T 2 , and the relationship is as follows [15,19]:…”

Section: E Relationship Between Fractal Dimension and Ucsmentioning

confidence: 99%

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Study on the Relationship between Pore Structure and Uniaxial Compressive Strength of Cemented Paste Backfill by Using Air‐Entraining Agent

Zhao

Yang

et al. 2021

Advances in Civil Engineering

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To control pores in the backfill, the air-entraining agents (AEAs) are used as an admixture to realize the pore structure changes under artificial action and explore the effect of pore structure on strength. Two AEAs at different dosages were added to the backfill. The relationship was then analyzed between them from the macro- and mesoscopic aspects. The results indicate that AEA can regulate pore structure changes of AEACPB. With the increase in AEA content, the total pore volume of different pore sizes in AEACPB increases, in which the proportion of big and medium pore gradually increases while the proportion of small pore gradually decreases. The AEACPB’s UCS is linearly negatively correlated with the porosity and pore percentage, which is the primary factor affecting the AEACPB of the pore structure. When the total pores’ volume in the AEACPB is constant, the influence of different pore structures differs. A higher proportion of small pores leads to a linear increase in strength; a higher proportion of medium pores leads to a linear decrease in strength; and a higher proportion of big pores leads to an exponential decrease in strength. And the fractal dimension has a linear negative correlation with the UCS by fractal theory analysis.

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Cross-scale characteristics of backfill material using NMR and fractal theory

Abstract: http://eprints.gla.ac.uk Experimental study of the cross-scale characteristics of backfill material using NMR and Fractal Theory

Cited by 43 publications

References 30 publications

Mechanical Properties and Microstructure Evolution of Cemented Tailings Backfill Under Seepage Pressure

Mechanical Properties and Microstructure Evolution of Cemented Tailings Backfill Under Seepage Pressure

Research on Strength Prediction Model of Sand-like Material Based on Nuclear Magnetic Resonance and Fractal Theory

Study on the Relationship between Pore Structure and Uniaxial Compressive Strength of Cemented Paste Backfill by Using Air‐Entraining Agent

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