Evolution characteristic and mechanism of microstructure, hydraulic and mechanical behaviors of sandstone treated by acid-rock reaction: Application of in-situ leaching of uranium deposits

Journal of Hydrology, Год журнала: 2024, Номер 643, С. 131948 - 131948

Опубликована: Сен. 1, 2024

Язык: Английский

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Uniaxial compressive damage evolution and constitutive modeling of fissure-like rocks under different loading rates based on acoustic emission

Scientific Reports, Год журнала: 2025, Номер 15(1)

Опубликована: Янв. 16, 2025

In natural environments, most rocks possess internal fissures and are often exposed to diverse external loads arising from engineering activities ground stress, among other factors. This study aims explore the influence of different loading rates on mechanical properties acoustic emission (AE) characteristics fissured develop an intrinsic damage model. To achieve this, prefabricated rock specimens that mimic were prepared. Uniaxial compression tests along with AE monitoring carried out at various rates. Subsequently, a loss-damage constitutive model was developed, which describes deformation process based characterization energy. The results as follows: (1) Prefabricated samples have lower strength compared non-fissured due existence fissures. As rate increases, both peak elastic modulus increase. (2) Stress thresholds significantly affected by rate, showing positive correlation. reduce these thresholds, thus accelerating process. (3) There is strong correlation between stress-strain curves. parameters, namely number rings, energy, cumulative go through three stages: calm development, active surge development. energy positively correlated while ringing counts decrease. (4) A constructed Logistic function can accurately represent specimen's response closely matches actual curve, indicating improved accuracy applicability.

Язык: Английский

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Uniaxial compression mechanical properties and deterioration mechanism of sandstone under different humidity conditions

Journal of Central South University, Год журнала: 2023, Номер 30(12), С. 4252 - 4267

Опубликована: Дек. 1, 2023

Язык: Английский

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Mechanical responses of chemically corroded sandstone under cyclic disturbance: Insights from fatigue properties and macro-micro fracturing mechanism

International Journal of Rock Mechanics and Mining Sciences, Год журнала: 2024, Номер 180, С. 105818 - 105818

Опубликована: Июнь 29, 2024

Язык: Английский

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Mechanical behavior and energy characteristics of red sandstone with different seawater immersion heights under biaxial compression

Physics of Fluids, Год журнала: 2024, Номер 36(8)

Опубликована: Авг. 1, 2024

Rock structures engineered during undersea mining are typically subjected to varying water distributions due the motion of seawater, which considerably influences their stability. Hence, it is essential understand influence seawater distribution on mechanical behavior and energy characteristics rocks. In this study, biaxial compression tests were conducted red sandstone at various immersion heights, acoustic emission signals monitored. The results illustrate that properties deteriorate significantly upon immersion. With an increase in height, peak strength elastic modulus rock specimens decreased exponentially. When height was varied from 0 1/4 H under lateral stresses 5, 10, 15, 20 MPa, by 18.94%, 20.29%, 17.47%, 14.87%, respectively, 4.6%, 8.1%, 11.7%, 10.9%, respectively. Brittleness also gradually. During compression, (AE) accumulated AE counts exhibited a stationary phenomenon, first increasing slowly then suddenly. However, decrease with height. Meanwhile, proportion tensile cracks gradually increased shear decreased. As increased, both total input strain decreased, whereas dissipated opposite trend.

Язык: Английский

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Experimental investigation of gas seepage characteristics in coal seams under gas-water-stress function

Scientific Reports, Год журнала: 2025, Номер 15(1)

Опубликована: Янв. 12, 2025

Seepage experiences were conducted on coal samples with diverse levels of moisture content, gas pressure, and effective stress to investigate how seepage in a seam is affected by the interaction gas, water, stress. The results study revealed intricate relationship between these factors their impact permeability behavior coal. findings indicate that, increasing specimens containing different varies distinctly. When have low displays pattern "increase - decrease increase" as pressure increases. However, further increase "increase-decrease" trend disappears. can be modeled using either quadratic or logarithmic function. On other hand, connection represented exponential At has most pronounced effect samples, followed content Conversely, at high influential factor Finally, model been developed that takes into account collective impacts research outcomes establish basis for optimizing recovery from seams.

Язык: Английский

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Superstatistical approach of electric potential and acoustic emission for investigating damage evolution and precursor of water-bearing sandstone under uniaxial compression

International Journal of Rock Mechanics and Mining Sciences, Год журнала: 2025, Номер 189, С. 106063 - 106063

Опубликована: Март 13, 2025

Язык: Английский

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Constitutive Model of Rock Considering High Temperature-Hydrochemical Corrosion-Confining Pressure Damage and Its Engineering Application

Modeling and Simulation, Год журнала: 2025, Номер 14(03), С. 667 - 681

Опубликована: Янв. 1, 2025

Язык: Английский

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3D geological model reconstruction and collapse risk evaluation of old goaf in Dunqiu iron mine

Scientific Reports, Год журнала: 2025, Номер 15(1)

Опубликована: Апрель 5, 2025

The complexity of goafs put forward higher requirements for detection methods. A comprehensive method old goaf is proposed, that is, determining the plane distribution range by using high-precision magnetic method, horizon natural source surface wave and controlled audio magneto telluric modifying geophysical exploration results engineering drilling. Taking Dunqiu iron mine China as an background, successfully applied. areas formed mining No. 1-3 orebody groups are 8640.6 m2, 4992.5 m2 6740.4 respectively. can be divided into pure backfill goaf, which 1-7 layers, 30.2-115.0 m buried depth, 1.6-271.3 thickness. 3D geological model constructed displaying situation visually. volumes 159,187.13 m3, 125,604.57 m3 174,435.28 stability evaluated two methods: influence depth critical load depth-thickness ratio poor has a risk collapse. have certain guiding significance treatment in mine.

Язык: Английский

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Mechanical properties of steel tubes filled with coal gangue concrete in a corrosive environment

Alexandria Engineering Journal, Год журнала: 2025, Номер 126, С. 418 - 440

Опубликована: Май 3, 2025

Язык: Английский

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