Study of the velocity effect on the energy dissipation structure of overlying rock at a fully mechanized mining face

Energy, Год журнала: 2025, Номер unknown, С. 135315 - 135315

Опубликована: Фев. 1, 2025

Язык: Английский

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Role of hole depth on mechanical behavior and acoustic emission characteristics of pre-drilled sandstone

Frontiers in Earth Science, Год журнала: 2025, Номер 13

Опубликована: Янв. 23, 2025

To examine the influence of hole depth on mechanical properties rock, a series uniaxial compression tests were performed six groups pre-drilled sandstone samples, each with varying depths. Also, multiple physical fields coupled acoustic emission (AE) and digital image correlation (DIC) systems synchronously employed to monitor fracturing process. The study focused characterizing cracking fracturing, energy evolution, fracture patterns in sandstones different findings show that peak strength decreases linearly increase depth. mode transits from simple unilateral spalling complex characterized by fractures spalling. AE analysis shows deeper borehole, lower signal frequency, indicating fewer but more significant events. With depth, elastic sample 29.81 kJ/m 3 22.65 , dissipated increases 4.48 6.25 . Moreover, displays distinct multifractal spectrum features under stress levels. width (Δ α ) varies 0.419 0.227, suggesting small-scale events predominantly govern failure mechanism. DIC observation major principal strain concentration mainly occurs around hole. monitoring points cumulative at P2 P6 is significantly higher compared other regions. Furthermore, it observed release pathways originating newly formed cracks dislocation slips become diversified,

Язык: Английский

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Fatigue behaviors of pre-flawed orthoclase granite under monotonic and multi-level cyclic loadings

Theoretical and Applied Fracture Mechanics, Год журнала: 2025, Номер unknown, С. 104858 - 104858

Опубликована: Янв. 1, 2025

Язык: Английский

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Macro-mesoscopic study of the deformation and failure mechanism of through-boundary type locked rock masses

Theoretical and Applied Fracture Mechanics, Год журнала: 2025, Номер unknown, С. 104891 - 104891

Опубликована: Фев. 1, 2025

Язык: Английский

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Mechanical behavior and damage constitutive model of fractured granite after high-temperature treatment based on 3D digital image correlation

Theoretical and Applied Fracture Mechanics, Год журнала: 2025, Номер unknown, С. 104919 - 104919

Опубликована: Март 1, 2025

Язык: Английский

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Effects of Stress States and Joint Configurations on Dynamic Mechanical Properties of Rock Masses

Materials, Год журнала: 2025, Номер 18(8), С. 1699 - 1699

Опубликована: Апрель 9, 2025

In complex geological environments, the discontinuous dynamic response behavior of jointed rock masses under coupled effects in situ stress and transient disturbances significantly exacerbates risk surrounding instability. This study establishes three-dimensional numerical models various rocks uniaxial-biaxial-triaxial split Hopkinson pressure bar (SHPB) experimental systems through coupling finite difference method (FDM) discrete element (DEM). The adhere to one-dimensional wave propagation assumption satisfy equilibrium requirements, demonstrating mechanical responses consistent with physical experiments. results reveal that synergistic-competitive between joint configuration initial pre-compression jointly dominate rocks. Multiaxial promotes development secondary force chain networks, enhances impact resistance multi-path transfer mechanisms, improves strain energy storage density during peak stages, drives failure modes evolve from macroscopic through-going fractures localized crushing zones. spatial heterogeneity configurations induces anisotropic characteristics principal fabric. Single maintain structural integrity due restricted weak plane propagation, while cross/parallel joints exhibit geometrically induced synergistic effects, forming differentiated crack paths intensify frictional kinetic dissipation. Through cross-scale model comparisons, evolution fabric, particle displacement distribution, microcrack dissipation mechanisms were analyzed, unveiling regulatory state on response. provides a theoretical basis for impact-resistant structure optimization instability early warning deep engineering projects involving rock.

Язык: Английский

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Uniaxial reloading mechanical properties and fractal characteristics of triaxial unloading injured sandstone

KSCE Journal of Civil Engineering, Год журнала: 2025, Номер unknown, С. 100305 - 100305

Опубликована: Июнь 1, 2025

Язык: Английский

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Investigation of mechanical and ultrasonic properties of sandstone with different flaws characteristics under triaxial stress

Theoretical and Applied Fracture Mechanics, Год журнала: 2024, Номер unknown, С. 104689 - 104689

Опубликована: Сен. 1, 2024

Язык: Английский

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Numerical characterization on fracture evolution behavior of pre-flawed sandstone under monotonic and multilevel cyclic loading

Theoretical and Applied Fracture Mechanics, Год журнала: 2024, Номер 133, С. 104634 - 104634

Опубликована: Авг. 28, 2024

Язык: Английский

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Study on the time delay failure characteristics of sandstone unloading under dynamic disturbance

Deleted Journal, Год журнала: 2024, Номер unknown, С. 100114 - 100114

Опубликована: Окт. 1, 2024

Язык: Английский

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