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Article
Mathematics, Interdisciplinary Applications
Zhibo Zhang et al.
Summary: The study investigates the velocity dispersion characteristic of elastic waves in rocks, which is of significant importance in rock engineering. The experiment conducted cyclic loading and unloading of elastic wave propagation in limestone to analyze the velocity dispersion characteristic. The results indicate that there is a positive correlation between velocity and frequency, and the fracture degree influences the velocity dispersion characteristic.
FRACTALS-COMPLEX GEOMETRY PATTERNS AND SCALING IN NATURE AND SOCIETY
(2023)
Article
Energy & Fuels
Haifei Lin et al.
Summary: The CH4 adsorption-desorption-seepage characteristics of coal are important indicators for measuring the gas extraction capacity of coal seam. The deformation of coal caused by CH4 adsorption-desorption-seepage is a significant factor affecting the CH4 extraction ability. This study conducted synchronous test experiments on CH4 adsorption-desorption-seepage and coal deformation under different gas pressures. It analyzed the timely characteristics of CH4 adsorption-desorption-seepage and coal deformation, clarified the influence of gas pressure, and discussed the quantitative relationship between CH4 adsorption-desorption-seepage and coal deformation. A whole-process strain model of coal for CH4 adsorption-desorption-seepage was established. The research findings showed that increasing gas pressure can promote the CH4 adsorption-desorption-seepage and deformation of coal, and the deformation is affected by coal bedding structure and external stress. The strain caused by CH4 adsorption-desorption-seepage in coal has different growth relationships with the adsorption capacity, desorption capacity, and seepage capacity of CH4. The study provides theoretical support for the efficient extraction of coal seam gas.
Article
Chemistry, Multidisciplinary
Andronikos Loukidis et al.
Summary: In this study, the acoustic emission (AE) data during uniaxial compressive loading of prismatic marble specimens were analyzed using non-extensive statistical mechanics (NESM). The relationship between the q entropic indices and the beta(q) parameters in terms of the applied stress was studied. The possible non-monotonicity between q and beta(q) was investigated for its potential association with damage accumulation and final fracture.
APPLIED SCIENCES-BASEL
(2023)
Article
Mechanics
Nitin B. Burud et al.
Summary: The dependence of current events on past events, known as long memory phenomenon, is significant in stochastic processes. The complexity of concrete fracture process arises from long-range interactions of multi-scale cracks, which may lead to long memory effects. We quantify the long memory effect in concrete fracture process using Hurst exponent for acoustic emission measurements. The magnitude and inter-event time series are studied for three different beam sizes under monotonic and fatigue loading. The long memory effect is strongly observed under fatigue loading. Local variations in Hurst exponent reveal the fundamental difference between monotonic and fatigue loading, which can be utilized for damage detection in concrete.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Multidisciplinary Sciences
Shuang-Xi Yuan et al.
Summary: In this study, compression shear experiments were conducted to investigate the effects of different patterns of prefabricated fractures and grain size compositions on the fracture characteristics, acoustic emission characteristics, and mechanical properties of rock masses. The experimental results revealed the fracture patterns, fracture processes, and mechanical characteristics of rock masses with different fracture patterns. It was found that the grain size composition had an impact on the peak shear stress and corresponding shear displacement of the rock mass. The acoustic emission characteristics also differed depending on the fracture pattern and grain size composition. The study highlights the importance of considering these factors in understanding rock mass behavior.
SCIENTIFIC REPORTS
(2022)
Article
Energy & Fuels
Chenliang Hou et al.
Summary: This paper investigates the micro-deformation and fracture-evolution of in-situ coal seam through simulation experiments considering temperature, confining pressure, and differential stress. The study finds that coal micro-deformation involves both brittle and ductile deformation mechanisms, and fractures tend to propagate along the direction of differential stress in stress-concentrated regions. The effects of each factor on coal fracture evolution vary at different stages of deformation.
JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING
(2022)
Article
Mechanics
Yang Dongjie et al.
Summary: The study conducted an in-depth investigation on granite using high confining pressure cyclic loading for predamage experiments, demonstrating that granite exhibits varying degrees of damage during the cyclic loading process. The energy signal released by granite when rupturing in the predamage experiment weakens with an increase in cycle number, and the fracture mode also changes accordingly.
ENGINEERING FRACTURE MECHANICS
(2022)
Article
Engineering, Mechanical
Wenbo Ma et al.
Summary: Studying the crack evolution behaviors and mechanism of concrete specimens with holes is important for civil building and underground engineering. This paper conducted uniaxial compressive tests on concrete specimens with circular holes and found that the presence of the holes leads to a larger degradation of mechanical parameters. Specimens with two holes have larger mechanical parameters compared to those with only one hole. Crack evolution in compressed specimens usually starts with primary tensile cracks, followed by slabbing cracks, and finally remote tensile or shear cracks away from the holes. The number and arrangement of the holes have a significant effect on the stress distribution.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2022)
Article
Geosciences, Multidisciplinary
Tianxuan Hao et al.
Summary: By designing infrared monitoring tests under different crack inclination angles, the precursor information of coal's infrared radiation temperature was studied. The results show that the infrared radiation sequences have a critical slowing down effect, and the variance and autocorrelation coefficients can be used to more accurately find the precursor time of instability, providing a theoretical basis for early warning of coal and rock dynamic hazards.
GEOMATICS NATURAL HAZARDS & RISK
(2022)
Article
Energy & Fuels
Xin Zhang et al.
Summary: Coal and gas outburst is a serious dynamic disaster in coal mining. This study explores the characteristics and risk levels, and proposes a new prediction method based on acoustic emission parameters.
Article
Multidisciplinary Sciences
Xin Zhang et al.
Summary: Coal and gas outburst is a major geological disaster that poses a serious threat to the safety of coal mine production. Recent studies have shown that with increasing mining depth, outbursts have become more frequent. By simulating coal and gas outbursts at different depths, it has been observed that the critical gas pressure decreases and the unit outburst intensity increases sharply with increasing simulation depth. The variation of gas pressure during the incubation and excitation stages follows specific rules and can be assessed by acoustic emission energy, providing a scientific reference for predicting and preventing deep mining disasters caused by coal and gas outbursts.
SCIENTIFIC REPORTS
(2022)
Article
Geochemistry & Geophysics
Wenqiang Ma et al.
Summary: This study used numerical simulation to investigate the influence of joint length or number on the mechanical behavior, crack evolution, and failure characteristics of jointed rock specimens. The results showed that an increase in random joint length or number led to a decrease in compressive strength and elastic modulus, and a transition from brittle to ductile fracture behavior. With increasing joint length or number, cracks and acoustic emission events in the joints increased significantly and exceeded those in intact rock, indicating a strong impact on the mechanical behavior and crack evolution of the specimens.
Article
Engineering, Civil
Dong Zhou et al.
Summary: Acoustic emission and digital image correlation techniques were utilized to study the crack extension characteristics of soft and hard composite laminated rock masses with double fissures under uniaxial compression, providing early warning for rock fracture instability.
FRONTIERS OF STRUCTURAL AND CIVIL ENGINEERING
(2021)
Article
Engineering, Geological
Dexing Li et al.
Summary: The precursor information of rock fracture can be investigated through pressure stimulated current experiments, revealing that weak currents are generated instantaneously when loading is applied on sandstone samples and correspond well to stress variations. The response of pressure stimulated currents differs in different deformation stages, serving as precursors to rock fracture. Additionally, the variations in accumulated charge and current change rate also provide insights into predicting rock failure.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2021)
Article
Engineering, Mechanical
Xiaoran Wang et al.
Summary: The experimental study on microcracks in hard coal beams using AE technique revealed various mechanisms of microcracks, with localized shear and tensile displacements and predominantly mode-I opening microcracks in the global coordinate system. The orientation of microcrack planes was found to be mostly vertical, with a majority of AE sources having angle less than 30 degrees with the horizontal direction. The study also showed energy dissipation mainly above the crack tip during coal fracture, with AE magnitudes following the Gutenberg-Richter relation.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2021)
Article
Energy & Fuels
Lei Qin et al.
Article
Energy & Fuels
Xuelong Li et al.
ENERGY SOURCES PART A-RECOVERY UTILIZATION AND ENVIRONMENTAL EFFECTS
(2020)
Article
Construction & Building Technology
Xiaoran Wang et al.
CONSTRUCTION AND BUILDING MATERIALS
(2019)
Article
Engineering, Geological
Dimos Triantis et al.
ROCK MECHANICS AND ROCK ENGINEERING
(2018)
Article
Engineering, Geological
Tsuyoshi Ishida et al.
ROCK MECHANICS AND ROCK ENGINEERING
(2017)
Article
Mathematics, Interdisciplinary Applications
Xiangguo Kong et al.
CHAOS SOLITONS & FRACTALS
(2017)
Article
Construction & Building Technology
Xiaoran Wang et al.
CONSTRUCTION AND BUILDING MATERIALS
(2017)
Article
Engineering, Geological
H. Munoz et al.
ROCK MECHANICS AND ROCK ENGINEERING
(2016)
Article
Energy & Fuels
Xiangguo Kong et al.
JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING
(2015)
Article
Engineering, Geological
Eyvind Aker et al.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2014)
Article
Engineering, Geological
M. C. He et al.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2010)
Article
Geochemistry & Geophysics
Osvanny Ramos
Review
Multidisciplinary Sciences
Marten Scheffer et al.
Article
Multidisciplinary Sciences
Vasilis Dakos et al.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2008)
Article
Ecology
SR Carpenter et al.
Article
Engineering, Geological
T Backers et al.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2005)
Review
Engineering, Geological
A Lavrov
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2003)
