3D Observations of Fracturing in Rock-Backfill Composite Specimens Under Triaxial Loading

Yu, Xin; Kemeny, John; Li, Jialuo; Song, Weidong; Tan, Yuye

doi:10.1007/s00603-021-02498-9

Cited by 28 publications

(10 citation statements)

References 35 publications

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“…Some scholars also conduct uniaxial, triaxial, or shear tests on the RBCS samples to investigate the CTB volume and stress path on the strength and fracture behaviors. [21][22][23][24][25] Evidently, these studies have shed light on the mechanical behaviors of RBCS exposed to static monotonous loading. However, the RBCS in the stope is not only subjected to static loading but also the disturbed stress (e.g., blast vibration, excavation, and earthquake), and the disturbed stress is usually equivalent to cyclic or fatigue loads.…”

Section: Introductionmentioning

confidence: 89%

“…Moreover, Fang et al 20 proposed a coupled chemo‐elastic cohesive zone model to investigate the mechanical behaviors of interfaces, the effect of curing time and cement hydration on interface damage was studied. Some scholars also conduct uniaxial, triaxial, or shear tests on the RBCS samples to investigate the CTB volume and stress path on the strength and fracture behaviors 21–25 . Evidently, these studies have shed light on the mechanical behaviors of RBCS exposed to static monotonous loading.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Introductionmentioning

confidence: 89%

Section: Introductionmentioning

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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show abstract

“…Excavation and blasting disturbances in engineering infuence the backfll support stability. Most of the existing studies on backfll have focused on its static properties, such as uniaxial compression, triaxial compression, Brazilian splitting, three-point bending moment testing, and rheological characteristics [1][2][3][4][5]. In addition, several scholars have examined the infuence of dynamic loading and the loading rate on the mechanical properties, damage law, and energy dissipation law of the backfll.…”

Section: Introductionmentioning

confidence: 99%

PFC2D-Based Analysis of the Effect of the Axial Loading Rate on the Mechanical Properties of Backfill

Kun

Wang

2023

Advances in Materials Science and Engineering

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The unloading failure process in mining engineering scenarios is similar to the loading failure process at different loading rates indoor. To clarify the relationship between the mechanical properties of backfill and the loading rate, a particle flow code 2D-based numerical simulation was performed to establish the backfill model, and tests involving five loading rates were conducted. The following results were obtained: (1) the compressive strength of the backfill body increases linearly with the increase in the loading rate. The peak strain increases in an S-shaped manner, and the modulus of elasticity first increases and then decreases. (2) The evolution of cracks is similar to that of damage energy consumption, and a smaller rate means that the curve’s inflection point arrives earlier. (3) Tensile failure is the dominant failure mode. As the rate increases, the model destruction mode transforms from single to multiple failures, and the crack distribution becomes denser. (4) The backfill body exhibits a uniform destruction form at all loading rates. However, the difference in the loading rate leads to different energy consumption growth rates and total energy consumption.

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“…Koupouli et al 12 conducted direct shear tests on RBCS samples to study the interface frictional behaviors for CTB with different curing times, a strain‐hardening behavior were observed for CTB‐rock interface. Yu et al 13 conducted triaxial compression tests on RBCS samples; acoustic emission detection and CT scanning technique were used to analyze the fracture information. Zhao 14 used Karagozian‐case concrete model to numerically assess the uniaxial compressive strength of RBCS samples; the effect of backfill inclination on damage initiation and propagation were analyzed.…”

Section: Introductionmentioning

confidence: 99%

On the fracture and energy characteristics of rock–backfill composite structure specimens exposed to fatigue–creep interaction loading

Wang,

Yi,

Long

et al. 2023

Fatigue Fract Eng Mat Struct

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A series of stress‐controlled fatigue–creep interaction loading tests were performed on rock–backfill composite structure (RBCS) samples. The testing results reveal the influence of cement/tailing (c/t) on deformation, energy dissipation, damage evolution, and macro–meso failure patterns. The equivalent lifetime of RBCS is the largest for a sample with smaller stiffness filling, a smaller stiffness filling leads to weaker volumetric expansion. Additionally, strain energy is relatively large for larger stiffness filling, indicating a larger proportion of energy release at failure. A dissipated energy‐based damage evolution model is proposed to describe damage propagation at the entire fatigue–creep process which fits well with the experimental data. Moreover, the macro–meso failure pattern reveals the interactions between surrounding rock and filling material, failure seems to change from tension splitting to shear with increasing c/t. Good agreement was found among the volumetric deformation, energy dissipation, and failure pattern. It is suggested that flexible backfilling is benefit to prevent rock spalling and collapse.

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3D Observations of Fracturing in Rock-Backfill Composite Specimens Under Triaxial Loading

Cited by 28 publications

References 35 publications

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

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

PFC2D-Based Analysis of the Effect of the Axial Loading Rate on the Mechanical Properties of Backfill

On the fracture and energy characteristics of rock–backfill composite structure specimens exposed to fatigue–creep interaction loading

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