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Article
Chemistry, Physical
Junjun Liu et al.
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.
Article
Mathematics
Pin Wang et al.
Summary: Microwave irradiation on rocks can effectively reduce equipment wear and energy consumption during mechanical cutting. The increase in water content improves the microwave heating capacity of the rock and leads to a decrease in weight, P-wave velocity, and tensile strength, as well as an increase in porosity and damage factor.
Article
Mining & Mineral Processing
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.
INTERNATIONAL JOURNAL OF MINING SCIENCE AND TECHNOLOGY
(2023)
Article
Engineering, Geological
Jun Zhu et al.
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.
ENGINEERING GEOLOGY
(2022)
Article
Engineering, Geological
A. Matejunas et al.
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
(2022)
Article
Chemistry, Multidisciplinary
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
(2022)
Article
Geosciences, Multidisciplinary
Shengli Yang et al.
Summary: This study examines the interaction between support and strata under static-dynamic loading disturbance. The results show that the change in static load and dynamic load affects the support resistance and coal wall displacement. Static load has little effect on support resistance but has a large impact on coal wall displacement. There is a threshold for the stability of the coal wall under static load.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Energy & Fuels
Qinggang Chen et al.
Summary: The study found that the stability of the layered clastic rock roadway in deep mining process is affected by the response characteristics under static-dynamic loading conditions. Deformation of surrounding rock is significantly influenced by buried depth, and dynamic load amplitude determines response time.
GEOMECHANICS AND GEOPHYSICS FOR GEO-ENERGY AND GEO-RESOURCES
(2022)
Article
Engineering, Environmental
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.
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2022)
Article
Engineering, Mechanical
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
(2022)
Article
Chemistry, Physical
Diyuan Li et al.
Summary: This study investigated the effects of three typical loading methods on the damage mechanism of rock specimens in dynamic Brazilian tests using five different rocks. The results showed that the loading modes significantly influenced the loading rate and dynamic tensile strength of the specimens, with mode-III loading exhibiting the highest values. The crack initiation position of the specimen in the dynamic Brazilian test was determined by the loading mode.
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
(2022)
Article
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
(2022)
Article
Green & Sustainable Science & Technology
Feng Li et al.
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.
Article
Green & Sustainable Science & Technology
Yakang Li et al.
Summary: This study investigated the influence of hydraulic fracturing on the mechanical properties of a rock-coal combined body through numerical simulation, revealing that parallel pre-cracks significantly affected the specimen's mechanical properties, with different angles of parallel cracks leading to varying effects on the specimen's performance.
Article
Mathematics
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
(2022)
Review
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
(2022)
Article
Engineering, Multidisciplinary
Helong Gu et al.
Summary: This study found that the dynamic mechanical properties of sandstone are significantly affected by water saturation, which is influenced by porosity. The weakening degree of water saturation in sandstone is positively correlated with porosity.
Article
Green & Sustainable Science & Technology
Chuanming Li et al.
Summary: The study shows that the presence of water can reduce the elastic limit of rock samples, making the rock more susceptible to deformation and damage. The higher the water content, the smaller the damage energy of the rock samples.
Article
Geochemistry & Geophysics
Zilong Zhou et al.
Summary: The mechanical behavior of rock materials is significantly influenced by water and temperature, showing a coupled effect on the mechanical properties of sandstone. Results indicate that under -60 degrees C, the compression strength and elastic modulus of dry specimens notably increase. Mechanical parameters of the saturated-frozen specimen are lower than the dry one but slightly higher than the saturated specimen at room temperature.
Article
Energy & Fuels
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.
Article
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
(2021)
Article
Geochemistry & Geophysics
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.
Article
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.
KSCE JOURNAL OF CIVIL ENGINEERING
(2021)
Article
Engineering, Geological
Yi Luo et al.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2020)
Article
Engineering, Geological
Xin Cai et al.
ENGINEERING GEOLOGY
(2020)
Article
Metallurgy & Metallurgical Engineering
Pin Wang et al.
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
(2020)
Article
Engineering, Geological
Zilong Zhou et al.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2019)
Article
Multidisciplinary Sciences
Chun Wang et al.
Article
Materials Science, Multidisciplinary
Yongchuan Zhao et al.
INTERNATIONAL JOURNAL OF DAMAGE MECHANICS
(2018)
Article
Engineering, Geological
Eunhye Kim et al.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2016)
Article
Engineering, Geological
Wancheng Zhu et al.
ROCK MECHANICS AND ROCK ENGINEERING
(2016)
Article
Engineering, Geological
J. B. Zhu et al.
ROCK MECHANICS AND ROCK ENGINEERING
(2016)
Article
Engineering, Geological
Zilong Zhou et al.
ROCK MECHANICS AND ROCK ENGINEERING
(2016)