Static mechanical characteristics and meso-damage evolution characteristics of layered backfill under the condition of inclined interface

Jiao, Huazhe; Zhang, Wenxiang; Yang, Yintang; Chen, Xinming; Yang, Liuhua; Shen, Huiming; Rong, Yangyang; Zhang, Haowen

doi:10.1016/j.conbuildmat.2022.130113

Cited by 37 publications

(8 citation statements)

References 33 publications

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“…The failure condition (crack, contact surface dislocation, etc.) of the specimen can often directly reflect the strength of filling materials with different mass concentrations in the process of uniaxial compression, and the specimen with low strength is more likely to generate cracks to release energy [22]. Therefore, the phenomenon of low strength of low concentration material in the bottom of the backfill can be well explained by the study of the energy release rate of crack and energy transfer process of layered backfill.…”

Section: Analysis Of Specimen Failure and Energy Characteristicsmentioning

confidence: 99%

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Strength and Crack Propagation Analysis of Layered Backfill Based on Energy Theory

Cai,

Sun,

Zhang

et al. 2024

Archives of Mining Sciences

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The strength of backfill is greatly influenced by its inclination angle and interlayer concentration. In order to study the influence of inclination angle and interlayer mass concentration on the strength of backfill, a group of layered cemented backfill with cement-sand ratio of 1:4, interlayer mass concentration of 66%, 67% and 68% and inclination angles of 0°, 10°, 20° and 30° were prepared by using tailings as aggregate. The uniaxial compression test was carried out to analyse the effect of interlayer mass concentration and inclination angle on layered cemented backfill. The crack propagation and energy change law of the specimen during compression were analysed by J-integral and energy conservation law. The relationship between the crack initiation and propagation and strain energy of two representative three-layer backfill specimens was analysed by numerical modelling. The results show that the increase in the layer number and the inclination angle of the backfill can weaken the strength of the backfill. In a certain range of inclination angles, the weakening coefficient of the backfill caused by the inclination angle is very consistent with the cosine value of the corresponding angle. Due to the release of crack energy and the existence of interface J integral, the uniaxial compressive strength of different mass concentration backfill is different at various positions. When the displacement reaches a certain value, the crack and strain energy no longer increase.

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Section: Analysis Of Specimen Failure and Energy Characteristicsmentioning

confidence: 99%

“…The deformation of the backfill unit under the action of uniaxial compression external force, assuming that there is no heat exchange with the outside world in this physical process, according to the law of conservation of energy, there is the following relationship [23]:…”

Section: Specimen Energy Characteristicmentioning

confidence: 99%

Strength and Crack Propagation Analysis of Layered Backfill Based on Energy Theory

Cai,

Sun,

Zhang

et al. 2024

Archives of Mining Sciences

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“…The disturbed stress and creep actions both influence its long-term stability. As a result, different from the previous studies on the static and highstrain impact mechanical properties, 8,[35][36][37] alternative fatigue loading and creep loading are applied on RBCS sample to investigate the influence of stress amplitude on RBCS failure behaviors. The loading path in this work is more in line with the actual stress condition of RBCS material, and the experimental results reveal the effect of disturbed amplitude on the macroscopic and mesoscopic failure features.…”

Section: Characterization Of Damage Propagationmentioning

confidence: 99%

Alternative fatigue–creep performance of rock‐backfill composite structure material in mine stopes under high static stress: Disturbed amplitude effect

Wang,

Long,

et al. 2023

Fatigue Fract Eng Mat Struct

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This work aims to investigate the dynamic stress amplitude on the mechanical responses of rock‐backfill composite structure material under alternative low‐cycle fatigue loading and creep loading tests. Results show that deformation, damage propagation, and failure pattern are all impacted by the stress amplitude, and volumetric deformation is the largest for a sample subjected to strong stress disturbance. The equivalent lifetime decreases with the increase of disturbed amplitude. A notable positive interaction between the fatigue damage and time‐dependent damage is found, and they promote each other. Additionally, a novel damage evolution model is proposed by the irreversible radial strain, and the model matches well with the testing data. Moreover, post‐test computed tomography imaging reveals that cracks at rock‐backfill interfaces are relatively easy to be stimulated under low stress disturbance, and it is suggested that tension‐splitting failure is more likely to occur within the surrounding rock, and shear failure seems to occur within the cemented tailings backfill for all the tested samples.

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“…Mining and utilizing mineral resources stimulate economic growth and generate substantial sediments and goaf [1][2][3]. China's total stockpile of tailings exceeds 25 billion tons, which wastes land resources and poses grave safety risks.…”

Section: Introductionmentioning

confidence: 99%

The Mechanism of Viscosity-Enhancing Admixture in Backfill Slurry and the Evolution of Its Rheological Properties

et al. 2023

Self Cite

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Since filling slurry is a cement-based material, viscosity-enhancing admixture exerts a significant effect on its rheological performance and mechanical properties. Viscosity-enhancing admixture can improve pipeline transportation performance and reduce pipeline wear during the filling process of a kilometer-deep mine by changing the plastic viscosity and yield stress of high-concentration filling slurries. In order to reveal the influence mechanism of viscosity-enhancing admixture on rheological performance in slurry, the influence of viscosity-enhancing admixture on the rheological performance of slurry is explored by adjusting viscosity-enhancing admixture dosage and conducting bleeding test, liquidity test, and rheological performance test. The extended DLVO theory is employed to analyze the mechanism of HPMC on the stability of filling slurry. The results show that compared with ordinary slurry, after adding HPMC and XG, the particles of filling slurry are prone to link to form a mesh structure. Besides, the increasing frictional force between particles results in a significant decrease in the bleeding rate and liquidity of the slurry. Such an effect becomes more obvious with the increase of viscosity-enhancing admixture dosage. Meanwhile, the overall effect of HPMC molecules is better than that of XG molecules since HPMC can reduce inter-particle repulsion and facilitate particle aggregation. The optimal dosage is about 0.1%, at which time the yield stress of the filling slurry increases from 89.236 to 160.06 Pa, the plastic viscosity increases from 0.296 to 1.063 Pa·s, and the compressive strength increases from 2.58 to 3.59 MPa in 28 days. The study reveals the influence of viscosity-enhancing admixture on the rheological performance of filling slurry and its evolution characteristics, which provides theoretical support for the development of filling resistance and wear reduction technology.

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Static mechanical characteristics and meso-damage evolution characteristics of layered backfill under the condition of inclined interface

Cited by 37 publications

References 33 publications

Strength and Crack Propagation Analysis of Layered Backfill Based on Energy Theory

Strength and Crack Propagation Analysis of Layered Backfill Based on Energy Theory

Alternative fatigue–creep performance of rock‐backfill composite structure material in mine stopes under high static stress: Disturbed amplitude effect

The Mechanism of Viscosity-Enhancing Admixture in Backfill Slurry and the Evolution of Its Rheological Properties

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