Mechanical properties and microstructure of layered cemented paste backfill under triaxial cyclic loading and unloading

Wang, Jie; Fu, Jianxin; Song, Weidong

doi:10.1016/j.conbuildmat.2020.119540

Cited by 50 publications

(14 citation statements)

References 31 publications

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“…The development of deep mining technology is accompanied by the rapid increase in the number and size of goaf [ 32 , 33 , 34 , 35 , 36 , 37 ]. Limited by the current domestic filling technology, it is almost impossible to fill large-scale mined-out areas once, which leads to the stratification of the filling body due to layer-by-layer filling [ 38 , 39 , 40 , 41 ]. Different from the complete backfill, the structural characteristics and mechanical properties of layered backfill are more complicated.…”

Section: Introductionmentioning

confidence: 99%

Micro-Mechanism of Uniaxial Compression Damage of Layered Cemented Backfill in Underground Mine

Chen

Zhang

et al. 2022

Materials

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Layering of filling body is common in large-scale filling areas. In this paper, the cement–sand ratio of 1:8 is based on the configuration of 68%, 70%, 72% and 74%; four concentrations; and filling layers of one-, two-, three- and four-layered cemented filling samples. Combined with a uniaxial compression test and two-dimensional particle flow software (PFC2D), the mechanical properties and failure modes were explored. The results show that the concentration can strengthen the uniaxial compressive strength of the filling body while increasing the filling times weakens its power; therefore, the constitutive damage model was constructed. It was found that the initial layered damage existed in the layered filling, and the total damage showed an upward trend of first fast and then slow; the main failure modes of one-layer and two-layer backfills showed prominent shear failure characteristics, and the three-layer and four-layer fillings were closer to tensile failure. From the crack generation to the specimen failure, there is a mutual conversion between different energies.

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Section: Introductionmentioning

confidence: 99%

Micro-Mechanism of Uniaxial Compression Damage of Layered Cemented Backfill in Underground Mine

Chen

Zhang

et al. 2022

Materials

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“…Moreover, Wu et al [56] tested triaxial compression and ultrasonic detection to determine the relationship between ultrasonic wave velocity (UPV) and CPB strength parameters. Wang et al [57] studied the relationship between layered CPB strength and limiting pressure under triaxial cyclic loading conditions.…”

Section: Resultsmentioning

confidence: 99%

Application of Cement Paste in Mining Works, Environmental Protection, and the Sustainable Development Goals in the Mining Industry

et al. 2022

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Cement paste is an already well-known material used in ore mining. It is mainly used to fill excavation areas and the tailings from the surface return to underground mines. In this way, the amount of deposited material and degradation of the surface of the terrain are reduced. The paste itself can be used as an artificial barrier between mining works and underground watercourses. Significant economic and environmental benefits can be expected from using cement paste, which would contribute to sustainable development. The basic materials that make up cemented paste backfill (CPB) are flotation tailings, cement, and water. For CPB to be adequately and safely applied to the filling of excavation spaces and indirectly to the protection of the groundwater, environment, and sustainable development of the mining industry, it must meet certain physical–mechanical, physicochemical, and deformation properties. This paper presents the results of synthesized and analyzed samples of different compositions based on flotation tailings (from the production of ZiJin Copper in Bor, Serbia), cement, and water. The methods used for chemical and mineralogical tests include inductively coupled plasma atomic emission spectroscopy (ICP-AES), atomic absorption spectroscopy (AAS), X-ray diffraction analysis (XRD), and nephelometric turbidity units (NTUs; turbidimetry). The results prepared with CPB consisting of 5% cement, 24% water, and 71% flotation tailings were the most acceptable.

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“…Also, Wu et al (2020a;2020b) conducted the triaxial compression and ultrasonic detection tests to determine the relationship between ultrasonic pulse velocity (UPV) and strength parameters of CPB. Wang et al (2020) studied the relationship between the strength of layered CPB and the confining pressure (σc) under triaxial cyclic loading and unloading conditions. In summary, existing studies indicated that the lateral constraint stress or confining pressure (σc) plays an important role on the mechanical behaviors of CPB.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on the triaxial mechanical behaviors of the Cemented Paste Backfill: Effect of curing time, drainage conditions and curing temperature

Xiu

Wang

et al. 2022

Journal of Environmental Management

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Mechanical properties and microstructure of layered cemented paste backfill under triaxial cyclic loading and unloading

Cited by 50 publications

References 31 publications

Micro-Mechanism of Uniaxial Compression Damage of Layered Cemented Backfill in Underground Mine

Micro-Mechanism of Uniaxial Compression Damage of Layered Cemented Backfill in Underground Mine

Application of Cement Paste in Mining Works, Environmental Protection, and the Sustainable Development Goals in the Mining Industry

Experimental study on the triaxial mechanical behaviors of the Cemented Paste Backfill: Effect of curing time, drainage conditions and curing temperature

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