Related references
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Summary: Rock breaking is a fundamental issue in deep underground engineering, and water plays a crucial role in the rock's response to microwave radiation. Therefore, experiments were conducted using red sandstone with varying water contents. The study focused on the damage characteristics and ultrasonic properties of the red sandstone after microwave radiation. The results showed that increasing water content decreased the time for complete formation of the rupture surface and resulted in more powdery rock cuttings and less surface roughness.
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Longyong Shu et al.
Summary: In this study, the coupling relationship between gas pressure and dynamic load in the coal body ahead of the working face was investigated. It was found that the impact rate of the dynamic load can significantly change the gas pressure, and the faster the impact rate, the speedier the increase in gas pressure. Three models of stress and gas pressure distribution were proposed for different working conditions. The results provide practical guidance for the prevention and early warning of coal and gas outbursts.
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Summary: This study investigates the mechanism of water-weakening effects on the direct tensile failure of marble rocks. The results show that the tensile strength of marble rock decreases significantly with increasing water content, resulting in variable fracture surfaces. The main mechanism for the deterioration of marble rock under direct tension is friction weakening caused by water.
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Summary: This study investigates the effects of water saturation on the dynamic compressive strength and fragmentation behavior of Indian gabbronorite. The results show that the saturated specimens have lower compressive strength compared to the dry specimens under dynamic loading conditions, but dynamic loading conditions can significantly increase the compressive strength of the specimens.
ROCK MECHANICS AND ROCK ENGINEERING
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Article
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Qi Ping et al.
Summary: The study reveals that the dynamic properties of sandstone specimens are affected by temperature and water, resulting in changes in mass, volume, density, dynamic compressive strength, dynamic tensile strength, average strain rate, and peak strain. The coupling effect of temperature and water causes structural damage to the sandstone specimens, rather than their own material composition.
APPLIED SCIENCES-BASEL
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FRONTIERS IN EARTH SCIENCE
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Shibing Huang et al.
Summary: Sandstones are easily damaged by water, and the strength loss is most significant when the water saturation is between 60% and 80%. The study identifies porosity, elastic modulus, and clay mineral content as the main intrinsic properties controlling the water-weakening degree of sandstones.
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Tubing Yin et al.
Summary: The effect of water content and rock bridge length on the physical and mechanical properties, crack propagation characteristics, and acoustic emission parameters of red sandstone were comprehensively investigated in this study. The results show that water content and bridge length have significant effects on the compressive strength, elastic modulus, and crack propagation model of red sandstone.
THEORETICAL AND APPLIED FRACTURE MECHANICS
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Diyuan Li et al.
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Article
Engineering, Geological
Chun Wang et al.
Summary: In this study, methods considering density, unloading rate, preloading axial and impact air pressure were applied to investigate hierarchical dynamic load disturbance based on blasting mining conditions of deep mineral resources. Stress-strain curves of copper-bearing skarn, obtained through test analysis, showed characteristics that varied in different stages. Macroscopic failure of the rock sample was primarily caused by impact dynamics load, leading to tensile failure supplemented by compression-shear and frictional failure. Damage variables were defined based on force deformation mechanism, and corresponding equations for loading-unloading stage and impact loading stage were deduced. Verification using test data showed good consistency between the theoretical and test stress-strain curves.
ROCK MECHANICS AND ROCK ENGINEERING
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Engineering, Mechanical
Kui Zhao et al.
Summary: This study investigates the influence of water on the crack and acoustic emission (AE) behavior evolution of red sandstone specimens during deformation and failure. Uniaxial compression tests were conducted under different water contents. The results show that the peak strength of red sandstone decreases with increasing water content, and the dominant failure pattern changes from tension to shear. The AE events rate can be used as a precursor for the instability and failure of rock specimens with different water contents.
THEORETICAL AND APPLIED FRACTURE MECHANICS
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Green & Sustainable Science & Technology
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Summary: This study investigates the dynamic response and failure process of combined coal and rock mass under impact loading through experiments and numerical simulations, and finds significant differences in stress-strain stages between high-velocity and low-velocity impacts. The findings are important for a better understanding of the development mechanism of coal and gas outbursts.
Article
Green & Sustainable Science & Technology
Baobao Chen et al.
Summary: This study conducted uniaxial compression and acoustic emission experiments to explore the mechanical characteristics of confined-pressure soaking (CPS) sandstone during the damage-fracture process. The results showed that CPS parameters had an impact on the uniaxial compressive strength and elastic modulus of sandstone. The increase in moisture content changed the fracture mode, and the degree of CPS was related to fracture fragmentation and mechanical behavior. Furthermore, this study proposed CPS damage variables to quantify the weakening degree and reveal the damage evolution process.
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Green & Sustainable Science & Technology
Yakang Li et al.
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Bing Dai et al.
Summary: Deep surrounding rocks experience coupled static-dynamic stress during mining, which can be studied through dynamic-static loading tests. A damage variable model is established to describe the damage evolution under dynamic-static loading.
Article
Energy & Fuels
Wenbing Fan et al.
Summary: In this study, a one-dimensional SHPB was used to conduct dynamic tests on deep-bedded sandstone. The fractal dimension, energy evolution, and distribution curve of deep-bedded sandstone with diverse angles and impact pressures were obtained. The damage factors were defined and the damage evolution mechanism of deep-bedded sandstone was analyzed. The results show that the impact pressure has a significant influence on the energy distribution and damage factors of deep-bedded sandstone.
GEOMECHANICS AND GEOPHYSICS FOR GEO-ENERGY AND GEO-RESOURCES
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Environmental Sciences
Fei Zhao et al.
Summary: This paper summarizes the research on the influence of dynamic loading on the properties of fissured rock samples using numerical and experimental methods. The impact of fissure characteristics on the mechanical properties and failure modes of rock under dynamic loading is analyzed, and the relationship between the strength and failure characteristics of different fissured rock samples is explored.
ENVIRONMENTAL EARTH SCIENCES
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Helong Gu et al.
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Green & Sustainable Science & Technology
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Xinying Liu et al.
Summary: Research indicates that the dynamic tensile strength of naturally saturated specimens increases with loading rate, but decreases with pre-tension. Additionally, the dynamic strength of naturally saturated sandstone is lower than that of natural sandstone, with similar fracture behavior. Water effects on mechanical properties, water wedging effect, and Stefan effect explain the dynamic tensile behavior of rocks with static preload.
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Engineering, Geological
Hongru Li et al.
Summary: The study reveals that water content significantly affects the mechanical behavior and acoustic emission signals of sandstone, with increases in water content leading to decreases in compression strength and elastic modulus, and increases in peak strain and energy dissipation. Acoustic emission energy decreases with water content, and sudden changes in signal characteristics can serve as precursors to rock destabilization and failure.
ENGINEERING GEOLOGY
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Jiazhuo Li et al.
Summary: The study examines the failure criteria and energy characteristics of surrounding rock under dynamic load disturbance in deep high static loading roadways, finding that stress and energy are concentrated in the shallow part of the roadway at first after disturbance but transfer to the deep part over time, leading to rock burst under certain conditions. The research provides a theoretical basis for predicting and preventing rock burst in coal mines by actively regulating the disaster-prone environment and mitigating the disaster-inducing conditions.
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Engineering, Civil
Caoyuan Niu et al.
Summary: This study found that water content has a significant impact on the dynamic failure behavior of rocks, with dry sandstone exhibiting the highest critical dynamic stress intensity factor and the slowest crack propagation speed; as water content increases, the critical dynamic stress intensity factor also increases, while crack propagation speed decreases.
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