Study on fatigue characteristics and thermal damage mechanism of red sandstone under high temperature-cyclic load coupling

Wang, Mengxiang; Li, Jiangteng; Han, Tian; Wang, Ju; Shi, Zhanming; Li, Kaihui

doi:10.1016/j.ijfatigue.2022.107405

Cited by 14 publications

(2 citation statements)

References 49 publications

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“…Because of the abundance of sedimentary and metamorphic rocks on the Earth's surface, transversely isotropic rocks are widely encountered in civil, mining, petroleum, geothermal, and radioactive waste-disposal engineering [4][5][6][7]. Moreover, rock engineering is frequently subject to cyclic loads resulting from natural and human-caused events, e.g., the geological tectonic movements, seismic actions, blasting excavations, and traffic transportations [8][9][10][11]. Hence, it is of significance to reveal the fracture mechanism of transversely isotropic rocks under cyclic loading for better evaluating the long-term stability of rock structures.…”

Section: Introductionmentioning

confidence: 99%

Anisotropic Mechanical Properties and Fracture Mechanism of Transversely Isotropic Rocks under Uniaxial Cyclic Loading

Li,

Du,

et al. 2024

Applied Sciences

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Transversely isotropic rocks, which are special anisotropic materials, are widely encountered in civil, mining, petroleum, geothermal, and radioactive waste-disposal engineering. Rock is frequently subject to cyclic loads resulting from natural and human-caused events. However, to date, the fracture mechanism of transversely isotropic rocks under cyclic loading remains poorly understood. To address this gap, uniaxial monotonic-loading and cyclic-loading tests were performed on slate specimens by the MTS815 system, during which acoustic emission (AE) signals inside the rock were monitored, and finally the fracture surfaces of the tested rock were scanned by scanning electron microscopy (SEM). Through these tests, the anisotropic mechanical properties, damage evolution, AE characteristics and fracture pattern of slate as a transversely isotropic rock were studied. The results show that the peak strength of specimens varies with the loading–foliation angle under monotonic and cyclic loading, following a U-shaped trend. The deformation modulus during unloading is more capable of characterizing the damage inside the specimen than that during loading. By defining the damage degree based on dissipation energy, it is found that the damage variable is influenced by the loading–foliation angle and the cyclic stress step. The AE characteristics of specimens exhibit significant anisotropy, closely correlated to the loading condition and loading–foliation angle. Regardless of cyclic stress step, the AE counts of specimens with a loading–foliation angle of 0° are mainly distributed near the peak region, whereas those of specimens with other loading–foliation angles occur primarily in the early stage of each cyclic loading. Finally, it is revealed that the fracture mechanism of slate specimens is determined by the loading–foliation angle, loading condition, and cyclic stress step.

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Section: Introductionmentioning

confidence: 99%

Anisotropic Mechanical Properties and Fracture Mechanism of Transversely Isotropic Rocks under Uniaxial Cyclic Loading

Li,

Du,

et al. 2024

Applied Sciences

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“…In order to study the fatigue characteristics of red sandstone after heat treatment, the stress-strain curve, deformation, energy, and damage were analyzed. When the tem-perature was lower than 400 • C, the brittleness, failure stress, and stiffness of sandstone were enhanced [15]. In order to study the effects of different temperature treatments on the porosity of sandstone in the creep stage, researchers used NMR and cyclic loadingunloading creep tests to determine the effect of temperature on the creep deformation of sandstone.…”

Section: Introductionmentioning

confidence: 99%

Hydration Absorption and Thermal Effects of Outcrop Porous Sandstone Based on Intelligent Experimental and Infrared Thermography Techniques

Hao,

Wang,

Cheng

et al. 2023

Energies

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Sandstones are enriched in deep energy reservoirs and also exist as outcrop rocks, where the pore characteristics of sandstone are influenced by hydration absorption and thermal effects. To study the influence of the initial temperature on the hydration absorption characteristics of outcrop porous sandstone in the Mogao Grottoes, China, an intelligent experimental device for rock hydration was used. The hydration absorption characteristics and temperature effects of sandstone were analyzed by using infrared thermography techniques to monitor the infrared radiation characteristics of the sandstone’s surface during hydration absorption. The experimental results show that the higher the initial temperature of the rock samples, the shorter the time it takes for the sandstone to absorb enough water to reach saturation. The temperature variation of sandstone with different initial temperatures was also determined; the variation in the hydration absorption of sandstone conforms to certain rules, which can be expressed by formulae containing certain parameters. The changing trend of hydration absorption in outcrop porous sandstone shows that the hydration absorption increases rapidly at first, and then the rate of increase slows down until the hydration absorption remains unchanged after saturation. The experimental technique and method provide feasible means and techniques to evaluate the hydration absorption and thermal effects of outcrop porous sandstone, for further detecting the weathering degree of rock grottoes and revealing the damage mechanisms.

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Investigation of the Fracture Characteristics of Rock Mass After Thermal–Mechanical Damage Coupling

Sun,

Yang,

Zhang

et al. 2024

Rock Mech Rock Eng

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Study on fatigue characteristics and thermal damage mechanism of red sandstone under high temperature-cyclic load coupling

Cited by 14 publications

References 49 publications

Anisotropic Mechanical Properties and Fracture Mechanism of Transversely Isotropic Rocks under Uniaxial Cyclic Loading

Anisotropic Mechanical Properties and Fracture Mechanism of Transversely Isotropic Rocks under Uniaxial Cyclic Loading

Hydration Absorption and Thermal Effects of Outcrop Porous Sandstone Based on Intelligent Experimental and Infrared Thermography Techniques

Investigation of the Fracture Characteristics of Rock Mass After Thermal–Mechanical Damage Coupling

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