Mechanical properties and damage evolution of cemented coal gangue-fly ash backfill under uniaxial compression: Effects of different curing temperatures

Liu, Weizhen; Chen, Juntao; Zhang, Guo; Yang, Hengze; Xie, Wenwu; Zhang, Yandong

doi:10.1016/j.conbuildmat.2021.124820

Cited by 28 publications

(3 citation statements)

References 46 publications

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“…Fu et al [46] constructed the damage constitutive model of layered cemented tailings backfill considering its layered structure and analyzed the effects of layer numbers and the confining pressure on the damage evolution law. Liu et al [47] constructed the damage constitutive model of cemented coal gangue-fly ash backfill and discussed the influence of curing temperature on damage evolution. Hou et al [48] established a triaxial creep damage constitutive model of cemented gangue-fly ash backfill and analyzed its creep damage characteristics.…”

Section: Introductionmentioning

confidence: 99%

The Energy Dissipation Mechanism and Damage Constitutive Model of Roof–CPB–Floor (RCF) Layered Composite Materials

Wang

Zhang

et al. 2022

Minerals

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The stability of composite material that is composed of roof rock, cemented paste backfill (CPB), and floor rock has an important impact on safe mining within metal mines. In order to explore the mechanical properties, acoustic emission (AE), energy dissipation, and damage evolution of roof–CPB–floor (RCF) layered composite materials, uniaxial compression (loading rate 0.02 mm/min) AE tests on RCF materials with different CPB height ratios were performed. The test results show that: (1) the uniaxial compressive strength (UCS) and elastic modulus (ER) of the RCF material were lower than those of the roof or floor rock and higher than that of the CPB. With the increase in the CPB’s height ratio from 0.2 to 0.7, the UCS and the ER decreased from 18.42 MPa to 10.08 MPa and 3.15 GPa to 1.79 GPa, respectively, and the peak strain first decreased from 0.695 to 0.510 and then increased from 0.510 to 0.595. The UCS increased as a polynomial function with the increase in the ER. (2) The AE ring count first increased slowly, then increased rapidly, and finally maintained a high-speed increase. The AE cumulative ring count at the peak point decreased with the increase in the CPB height ratio. The energy dissipation showed that the elastic energy UE accumulated slowly at first, then the dissipated energy UD increased, and finally the UE decreased and the UD increased almost linearly. The UT, UE, UD, UE–UT ratio and UD–UT ratio showed a decreasing trend, and the UE–UD ratio showed an increasing trend at the peak point with the increase in the CPB height ratio. (3) Two damage constitutive models were established based on the AE ring count and energy principle. The damage evolution process of RCF materials can be divided into three stages: the slow damage accumulation stage, stable damage growth stage, and rapid damage accumulation stage.

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Section: Introductionmentioning

confidence: 99%

The Energy Dissipation Mechanism and Damage Constitutive Model of Roof–CPB–Floor (RCF) Layered Composite Materials

Wang

Zhang

et al. 2022

Minerals

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“…Ma et al [34] conducted numerical simulation research on the coal-rock composite structure, established the damage constitutive model of a coal-rock composite structure based on energy consumption theory, and discussed the damage evolution law. Liu et al [35] studied the damage evolution characteristics of backfill at different temperatures, and considered that the damage evolution process of backfill can be divided into four stages: the nondestructive stage, the initial damage stage, the accelerated damage stage, and the stable damage stage. Cui et al [36] developed an evolutive elasto-plastic model, and established a damage constitutive model of cemented backfill based on this model; the important role of cemented hydrate in its damage evolution was studied.…”

Section: Introductionmentioning

confidence: 99%

The Energy Dissipation, AE Characteristics, and Microcrack Evolution of Rock–Backfill Composite Materials (RBCM)

et al. 2022

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The backfill in the stope usually forms a composite structure with the surrounding rock in order to bear pressure together to support the goaf and ensure the safe mining of subsequent ores. Based on laboratory tests and theoretical analysis, the energy and damage evolution of the rock–backfill composite materials (RBCM) are studied deeply. The results show that: (1) The σp (peak stress), εp (peak strain), and E (elasticity modulus) decreased with the increase of the internal backfill diameter. When the diameter of the backfill increases from 10 mm to 40 mm, σp decreases from 50.15 MPa to 18.14 MPa, εp decreases from 1.246% to 1.017%, and E decreases from 7.51 GPa to 2.33 GPa. The UT shows an S-shaped distribution, the UE shows an inverted U-shaped distribution, and the UD first increases slowly and then increases rapidly. The UTp, UEp, UDp, UEp/UDp, and UEp/UTp decrease by 67.38%, 97.20%, 58.56%, 32.64% and 13.64% respectively, and the UDp/UTP increases by 20.93% with the increases of the backfill diameter. (2) A damage constitutive model of the RBCM is established based on the energy consumption characteristics. The damage evolution curve shows an S-shaped distribution, and the damage rate evolution curve shows an inverted U-shaped distribution. (3) The AE correlation fractal dimension decreases with the increase of the strain gradient and damage value, and the AE correlation fractal dimension presents linear and exponential functions with them, respectively. With the increase of stress, microcracks first appear and gather in the internal backfill of the RBCM, and then microcracks appear and gather in the peripheral rock, which together lead to the macro penetration failure of the RBCM.

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“…The cemented gangue backfill material (CGBM) is a mixture made of coal gangue waste, fly ash waste, cement, and water (Zhang et al 2007). Owing to its relatively high strength and fine pumping performance, it has been extensively used in backfill mining for coal resources and controlling surface subsidence (Wu et al 2015;Wang et al 2021a;Chen et al 2020a;Hou et al 2020;Liu et al 2021a;Li et al 2020a;Sun et al 2019;Wu et al 2020). Backfill mining is also an effective mining method for the "Three Under" coal resources, under the building, water, and railway, which can minimize the impact of mining on the original environment (Sun et al 2018;Zhang et al 2021;Zhang et al 2017;Lu et al 2017;Chen et al 2016).…”

Section: Introductionmentioning

confidence: 99%

Effects of width-height ratio and roof-floor strength on the mechanical characteristics of cemented gangue backfill pier-column

Ran

Elchalakani²,

Yao³

et al. 2022

Environ Sci Pollut Res

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Cemented gangue backfill pier-column (CGBP) is the essential supporting component of the goaf in partial backfill mining or constructional backfill mining for controlling the surface subsidence of coal mining. The height of CGBP has been determined by the thickness of the coal seam, and thus the width-height ratio and roof-floor strength directly affect the bearing capacity of CGBP under axial compression. Herein the effect of width-height ratio (1/3-1/1) on the mechanical characteristics of CGBP with different curing ages under uniaxial compressive was system studied through experiment, and the damage process was analyzed by ultrasonic equipment and DIC. Based on the experimental results and discrete element theory, a three-phase numerical model for CGBP was established, which considered the real aggregate shape and distribution and the mechanical characteristics of each phase. Then, the effects of the end friction coefficient and the strength ratio of roof-CGBP-floor combination on the strength and failure characteristics of CGBP (large width-height ratio: 1/1-4/1) were investigated. The results show that: CGBP shows the width-height ratio effect obviously and the strength and ductility increase with the increase of the width-height ratio, and the widthheight ratio effect increases with the increase of curing age and strength ratio. The end friction constraint is the main reason for the width-height ratio effect, and the higher the friction coefficient is, the larger the width-height ratio effect shows, and the width-height ratio effect disappears without end friction constraint. The increase of the width-height ratio of CGBP and the strength ratio of the roof-CGBP-floor combination increases the strength of the combination.Whether the strength of the combination is greater than that of CGBP may have a roof-floor strength threshold or a strength ratio threshold, which are between 31. respectively. When the strength of the roof and floor is different, the strength of the combination is mainly controlled by the weak carrier and increases with the increase of the strength of the weak carrier. The peak strain energy of CGBP and combination increases with the increase of end friction coefficient, width-height ratio, and strength of roof and floor.

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Mechanical properties and damage evolution of cemented coal gangue-fly ash backfill under uniaxial compression: Effects of different curing temperatures

Cited by 28 publications

References 46 publications

The Energy Dissipation Mechanism and Damage Constitutive Model of Roof–CPB–Floor (RCF) Layered Composite Materials

The Energy Dissipation Mechanism and Damage Constitutive Model of Roof–CPB–Floor (RCF) Layered Composite Materials

The Energy Dissipation, AE Characteristics, and Microcrack Evolution of Rock–Backfill Composite Materials (RBCM)

Effects of width-height ratio and roof-floor strength on the mechanical characteristics of cemented gangue backfill pier-column

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