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Research on Fracture and Energy Evolution of Rock Containing Natural Fractures under Cyclic Loading Condition

GEOFLUIDS (2021)

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Energy evolution analysis and failure criteria for rock under different stress paths

Liming Zhang et al.

Summary: Triaxial loading and unloading tests on marble specimens revealed different failure patterns and energy storage limits under various stress paths. A nonlinear energy evolution model of rocks accurately predicts critical strain for rock failure.

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Permeability Evolution of Two-Dimensional Fracture Networks During Shear Under Constant Normal Stiffness Boundary Conditions

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Summary: The numerical modeling study of the permeability evolution of fracture networks during shearing under specific boundary conditions reveals a three-stage behavior, influenced by factors such as confining pressure, shear displacement, and fractal dimension. Hydraulic pressure tends to open fractures and enhance permeability, with a magnitude of enhancement similar to the increase in hydraulic pressure.

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Article Mechanics

Anisotropic fracture and energy characteristics of a Tibet marble exposed to multi-level constant-amplitude (MLCA) cyclic loads: A lab-scale testing

Y. Wang et al.

Summary: This study investigated the fatigue mechanical characteristics of marble with different interbed orientations under multi-level constant-amplitude cyclic loads. The results showed that the interbed structure has a significant impact on the mechanical properties of rocks, and different damage evolution characteristics were observed at different cyclic loading stages. Energy analysis and CT images confirmed that the rock structure controls the pattern of energy dissipation and release.

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Article Engineering, Mechanical

Experimental investigation of fatigue crack propagation in interbedded marble under multilevel cyclic uniaxial compressive loads

Yu Wang et al.

Summary: Multilevel cyclic loading-unloading uniaxial compressive testing, along with real-time acoustic emission monitoring and post-test computed tomography scanning, was used to study the anisotropic cracking propagation and crack classification in interbedded marble. The results show that fatigue strength and lifetime initially decrease and then increase with interbed orientation, reaching a minimum at 30 degrees. The distribution of RA and AF values is strongly influenced by the rock structure, especially the interbeds. Additionally, the CT imaging reveals the differences in cracking mode and the structurally dependent cracking propagation pattern.

FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES (2021)

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Article Engineering, Mechanical

Energy dissipation and damage evolution for dynamic fracture of marble subjected to freeze-thaw and multiple level compressive fatigue loading

Y. Wang et al.

Summary: The study investigates the fatigue mechanical behaviors of marble under freeze-thaw treatment, showing that fatigue strength and strain energy decrease while irreversible volumetric deformation increases with the number of cycles. The rate of dissipated energy increases as the cyclic loading level grows. A coupling damage variable is proposed to describe rock damage evolution after freeze-thaw treatment and fatigue loading, with a damage evolution model established to fit the experimental data showing two-phase damage accumulation characteristics.

INTERNATIONAL JOURNAL OF FATIGUE (2021)

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Article Engineering, Environmental

Numerical simulations of the failure process of anaclinal slope physical model and control mechanism of negative Poisson's ratio cable

Chun Zhu et al.

Summary: Researchers have established a numerical model and developed a numerical simulation model of NPR cables to simulate the slope failure process and the impact of cables on deformation. The numerical results show that NPR cables can absorb deformation energy and maintain stable resistance, preventing slope instability and driving the slope towards a new equilibrium state.

BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT (2021)

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Article Engineering, Geological

Mechanical behavior of marble exposed to freeze-thaw-fatigue loading

Zhengyang Song et al.

Summary: The test results indicate that an increase in FT cycles and fatigue load level accelerates the damage rate of marble, leading to larger axial strain rate, radial strain rate, and increasing Poisson's ratio. A warning level is defined based on the evolution of radial strain and Poisson's ratio. Advance ratio and lag ratio are effective indicators for predicting rock failure when subjected to FTF actions.

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Article Engineering, Geological

In-situ test and bolt-grouting design evaluation method of underground engineering based on digital drilling

Qi Wang et al.

Summary: The study highlights the importance of using digital drilling for rock support design and optimization in underground engineering. It proposes methods for testing and evaluating surrounding rock, and demonstrates the effectiveness of this approach through on-site tests.

INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES (2021)

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Article Engineering, Geological

A physical modeling-based study on the control mechanisms of Negative Poisson's ratio anchor cable on the stratified toppling deformation of anti-inclined slopes

Zhigang Tao et al.

Summary: This study investigates the mechanisms governing instability failure of anti-inclined slopes reinforced with NPR anchor cables, and obtains the evolution process of key parameters through physical model experiments. Furthermore, it proves that NPR anchor cables can be used to monitor the sliding force of anti-inclined slopes, laying a foundation for advanced instability warning technology.

INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES (2021)

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Article Engineering, Mechanical

Investigation on the effect of freeze-thaw on fracture mode classification in marble subjected to multi-level cyclic loads

Y. Wang et al.

Summary: Research on rock engineering in cold regions indicates that the type of crack can be classified based on RA and AF data set, with a decrease in the proportion of tensile cracks and an increase in shear/mixed cracks as freeze-thaw cycles increase. Additionally, b-value analysis reveals damage propagation at different cyclic levels, with a minimum b-value observed at the last cyclic level. Post-test CT scanning shows a complex crack network forming with low freeze-thaw treatment, and the scale of tensile cracks decreasing as freeze-thaw cycles increase.

THEORETICAL AND APPLIED FRACTURE MECHANICS (2021)

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Article Construction & Building Technology

Dynamic stability evaluation of underground cavern sidewalls against flexural toppling considering excavation-induced damage

Ang Li et al.

Summary: A novel dynamic method is proposed for evaluating the stability of high sidewalls subjected to flexural-toppling by integrating derived criterion, continuum modelling and microseismic data. The study defines a geo-mechanical model for analyzing toppling rock strata on high sidewalls and deduces potential energies equations using the Rayleigh-Ritz method. A quantitative stability evaluation methodology is presented considering progressive failure and the influence of fractures along bedding planes.

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Article Engineering, Geological

Fracture Evolution and Energy Characteristics During Marble Failure Under Triaxial Fatigue Cyclic and Confining Pressure Unloading (FC-CPU) Conditions

Y. Wang et al.

Summary: This study investigates the fracture evolution and energy characteristics of marble under fatigue cyclic loading and confining pressure unloading conditions, showing that the damage accumulation during fatigue loading stage influences the final failure mode and energy conversion. The post-test CT scanning reveals the effects of fatigue cycles on crack pattern and scale after FC-CPU testing, providing insight into the energy changes during the process.

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Article Engineering, Mechanical

Cyclic fatigue characteristics of strong burst-prone coal: Experimental insights from energy dissipation, hysteresis and micro-seismicity

Min Zhang et al.

INTERNATIONAL JOURNAL OF FATIGUE (2020)

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Article Engineering, Mechanical

On anisotropic fracture and energy evolution of marble subjected to triaxial fatigue cyclic-confining pressure unloading conditions

Y. Wang et al.

INTERNATIONAL JOURNAL OF FATIGUE (2020)

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Article Engineering, Geological

The Influence of Strain Rate on the Energy Characteristics and Damage Evolution of Rock Materials Under Dynamic Uniaxial Compression

Yongqiang Zhou et al.

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Fractional-order visco-elastoplastic constitutive model for rock under cyclic loading

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ARABIAN JOURNAL OF GEOSCIENCES (2020)

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Fracture behavior and damage mechanisms of sandstone subjected to wetting -drying cycles

Xin Cai et al.

ENGINEERING FRACTURE MECHANICS (2020)

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The evaluation criteria for rock brittleness based on double-body analysis under uniaxial compression

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GEOMECHANICS AND GEOPHYSICS FOR GEO-ENERGY AND GEO-RESOURCES (2020)

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Y. Wang et al.

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Effect of fatigue loading-confining stress unloading rate on marble mechanical behaviors: An insight into fracture evolution analyses

Yu Wang et al.

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On the effect of stress amplitude on fracture and energy evolution of pre-flawed granite under uniaxial increasing-amplitude fatigue loads

Y. Wang et al.

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Fracture failure analysis of freeze-thawed granite containing natural fracture under uniaxial multi-level cyclic loads

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Experimental Investigation on the Fatigue Mechanical Properties of Intermittently Jointed Rock Models Under Cyclic Uniaxial Compression with Different Loading Parameters

Yi Liu et al.

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Experimental Study of Relationship Between Energy Dissipation and Fatigue Damage From Observation of Slip Band by Atomic Force Microscope

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