Subjects -> MINES AND MINING INDUSTRY (Total: 82 journals)
Showing 1 - 42 of 42 Journals sorted alphabetically
American Mineralogist     Hybrid Journal   (Followers: 16)
Applied Earth Science : Transactions of the Institutions of Mining and Metallurgy     Hybrid Journal   (Followers: 4)
Archives of Mining Sciences     Open Access   (Followers: 3)
AusiMM Bulletin     Full-text available via subscription   (Followers: 1)
BHM Berg- und Hüttenmännische Monatshefte     Hybrid Journal   (Followers: 2)
Canadian Mineralogist     Full-text available via subscription   (Followers: 7)
CIM Journal     Hybrid Journal   (Followers: 1)
Clay Minerals     Hybrid Journal   (Followers: 9)
Clays and Clay Minerals     Hybrid Journal   (Followers: 5)
Coal Science and Technology     Full-text available via subscription   (Followers: 3)
Contributions to Mineralogy and Petrology     Hybrid Journal   (Followers: 14)
Environmental Geochemistry and Health     Hybrid Journal   (Followers: 3)
European Journal of Mineralogy     Hybrid Journal   (Followers: 14)
Exploration and Mining Geology     Full-text available via subscription   (Followers: 3)
Extractive Industries and Society     Hybrid Journal   (Followers: 2)
Gems & Gemology     Full-text available via subscription   (Followers: 2)
Geology of Ore Deposits     Hybrid Journal   (Followers: 5)
Geomaterials     Open Access   (Followers: 3)
Geotechnical and Geological Engineering     Hybrid Journal   (Followers: 9)
Ghana Mining Journal     Full-text available via subscription   (Followers: 3)
Gold Bulletin     Hybrid Journal   (Followers: 2)
Inside Mining     Full-text available via subscription  
International Journal of Coal Geology     Hybrid Journal   (Followers: 4)
International Journal of Coal Preparation and Utilization     Hybrid Journal   (Followers: 2)
International Journal of Coal Science & Technology     Open Access   (Followers: 1)
International Journal of Hospitality & Tourism Administration     Hybrid Journal   (Followers: 16)
International Journal of Mineral Processing     Hybrid Journal   (Followers: 8)
International Journal of Minerals, Metallurgy, and Materials     Hybrid Journal   (Followers: 12)
International Journal of Mining and Geo-Engineering     Open Access   (Followers: 4)
International Journal of Mining and Mineral Engineering     Hybrid Journal   (Followers: 8)
International Journal of Mining Engineering and Mineral Processing     Open Access   (Followers: 6)
International Journal of Mining Science and Technology     Open Access   (Followers: 4)
International Journal of Mining, Reclamation and Environment     Hybrid Journal   (Followers: 6)
International Journal of Rock Mechanics and Mining Sciences     Hybrid Journal   (Followers: 9)
Journal of Analytical and Numerical Methods in Mining Engineering     Open Access   (Followers: 1)
Journal of Applied Geophysics     Hybrid Journal   (Followers: 18)
Journal of Central South University     Hybrid Journal   (Followers: 1)
Journal of China Coal Society     Open Access  
Journal of China University of Mining and Technology     Full-text available via subscription   (Followers: 1)
Journal of Convention & Event Tourism     Hybrid Journal   (Followers: 6)
Journal of Geology and Mining Research     Open Access   (Followers: 10)
Journal of Human Resources in Hospitality & Tourism     Hybrid Journal   (Followers: 9)
Journal of Materials Research and Technology     Open Access   (Followers: 2)
Journal of Metamorphic Geology     Hybrid Journal   (Followers: 17)
Journal of Mining Institute     Open Access  
Journal of Mining Science     Hybrid Journal   (Followers: 5)
Journal of Quality Assurance in Hospitality & Tourism     Hybrid Journal   (Followers: 6)
Journal of Sustainable Mining     Open Access   (Followers: 3)
Journal of the Southern African Institute of Mining and Metallurgy     Open Access   (Followers: 6)
Lithology and Mineral Resources     Hybrid Journal   (Followers: 4)
Lithos     Hybrid Journal   (Followers: 11)
Mine Water and the Environment     Hybrid Journal   (Followers: 6)
Mineral Economics     Hybrid Journal   (Followers: 2)
Mineral Processing and Extractive Metallurgy : Transactions of the Institutions of Mining and Metallurgy     Hybrid Journal   (Followers: 14)
Mineral Processing and Extractive Metallurgy Review     Hybrid Journal   (Followers: 5)
Mineralium Deposita     Hybrid Journal   (Followers: 4)
Mineralogia     Open Access   (Followers: 2)
Mineralogical Magazine     Hybrid Journal   (Followers: 1)
Mineralogy and Petrology     Hybrid Journal   (Followers: 5)
Minerals     Open Access   (Followers: 2)
Minerals & Energy - Raw Materials Report     Hybrid Journal   (Followers: 1)
Minerals Engineering     Hybrid Journal   (Followers: 14)
Mining Engineering     Full-text available via subscription   (Followers: 7)
Mining Journal     Full-text available via subscription   (Followers: 4)
Mining Report     Hybrid Journal   (Followers: 3)
Mining Technology : Transactions of the Institutions of Mining and Metallurgy     Hybrid Journal   (Followers: 4)
Mining, Metallurgy & Exploration     Hybrid Journal  
Natural Resources & Engineering     Hybrid Journal  
Natural Resources Research     Hybrid Journal   (Followers: 5)
Neues Jahrbuch für Mineralogie - Abhandlungen     Full-text available via subscription   (Followers: 1)
Physics and Chemistry of Minerals     Hybrid Journal   (Followers: 4)
Podzemni Radovi     Open Access  
Rangeland Journal     Hybrid Journal   (Followers: 4)
Réalités industrielles     Full-text available via subscription  
Rem : Revista Escola de Minas     Open Access  
Resources Policy     Hybrid Journal   (Followers: 4)
Reviews in Mineralogy and Geochemistry     Hybrid Journal   (Followers: 5)
Revista del Instituto de Investigación de la Facultad de Ingeniería Geológica, Minera, Metalurgica y Geográfica     Open Access  
Rock Mechanics and Rock Engineering     Hybrid Journal   (Followers: 9)
Rocks & Minerals     Hybrid Journal   (Followers: 5)
Rudarsko-geološko-naftni Zbornik     Open Access  
Transactions of Nonferrous Metals Society of China     Hybrid Journal   (Followers: 9)
Similar Journals
Journal Cover
International Journal of Rock Mechanics and Mining Sciences
Journal Prestige (SJR): 2.259
Citation Impact (citeScore): 4
Number of Followers: 9  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 1365-1609 - ISSN (Online) 1365-1609
Published by Elsevier Homepage  [3298 journals]
  • Investigation of movement and damage of integral overburden during shallow
           coal seam mining
    • Abstract: Publication date: May 2019Source: International Journal of Rock Mechanics and Mining Sciences, Volume 117Author(s): Yunjiang Sun, Jianping Zuo, Murat Karakus, Jintao Wang Most prediction methods used to calculate mining-induced subsidence are empirical, which cannot explain the mechanism of fundamental rock strata movement. In this paper, based on key stratum theory and the mechanical analysis of overburden, a new analytical solution, the Analogous Hyperbola Subsidence Model (AHSM), was proposed to describe the movement and damage of inner burden. Mining-induced rock strata movement was verified using the Distinct Element Method (UDEC), to assess the performance of the theoretical model. Three subsidence parameters (Smax/T, Sgoaf/Smax, D/H), generally used to describe surface subsidence trough, agree with statistical field measurements of the South Coalfield in Australia. The surface subsidence and the movement boundary in the overburden are very close to the theoretical predictions. Additionally, the primary key stratum damages the least in the overlying strata: its broken length is the smallest. The width of subsidence trough and maximum surface subsidence increase as the primary key stratum drops.
       
  • Peridynamic simulation of thermal failure behaviors in rocks subjected to
           heating from boreholes
    • Abstract: Publication date: May 2019Source: International Journal of Rock Mechanics and Mining Sciences, Volume 117Author(s): Yun-Teng Wang, Xiao-Ping Zhou In this paper, a weakly coupled thermo-mechanical model within the framework of ordinary state-based peridynamics is proposed to investigate thermal cracking behaviors of rocks subjected to heating from boreholes. The weakly coupled thermo-mechanical ordinary state-based peridynamic model is decomposed into two parts, i.e., thermal conduction and mechanical deformation. In the first part, temperature distributions in solids are analyzed based on the heat conduction equations. While, in the second part, thermally-induced deformation and fracture can be simulated by the mechanical computations. Moreover, a multi-rate explicit time integration scheme is proposed to model thermal cracking phenomena in rocks to overcome different time-scale problems in multi-physical systems. A benchmark example with analytical solutions is firstly modeled to validate the correctness and accuracy of the proposed numerical method, and numerical convergence studies of the weakly coupled thermo-mechanical ordinary state-based peridynamics are also conducted. The present numerical results are in good agreement with the analytical solutions and the previous experimental data. Then, three numerical examples are performed to investigate thermally-induced cracking behaviors, i.e. cracking patterns and temperature and stress evolutions. The proposed numerical method not only provides a new tool for coupled thermal-mechanical fracture problems in geothermal engineering, but also reveals the mechanism of thermal cracking phenomena in rocks.
       
  • Redistribution of local fracture aperture and flow patterns by acidizing
    • Abstract: Publication date: May 2019Source: International Journal of Rock Mechanics and Mining Sciences, Volume 117Author(s): E. Asadollahpour, H. Hashemolhosseini, A. Baghbanan, E. Mohtarami Statistical and spatial distributions of apertures may be changed due to chemical dissolution. The chemical dissolution in rocks may result from the passage of acidic water through fractures or acid fracturing treatment. In this study, an acid injection cell was developed to simulate acidizing stimulation into fractures and investigate fractures surfaces etching and aperture evolution due to acidizing. Results showed that initial hydraulic and mechanical apertures and permeability (under zero stress) were increased due to fracture acidizing and a varying range of 2%–12% contact area was observed. Apertures before and after fracture acidizing followed a log-normal distribution and all of statistical moments were increased by acid injection while the calculated coefficient of variance in both arithmetic and logarithmic scales was decreased after acidizing. Correlation length increased in the direction of acid flow (x-direction) after acidizing. Results of fluid flow modeling using a developed finite element code showed a channeling path in the x-direction. Furthermore, using fast sequential simulation algorithm, apertures with various spatial correlation length in x and y directions were generated. Numerical modeling results of these generated aperture patterns showed that flow channelizing was increased by increasing of correlation length in the x-direction. Fluid flow rate was increased with increasing of correlation length in x-direction, while it decreased with increasing correlation length in y-direction.
       
  • Mechanical property and thermal damage factor of limestone at high
           temperature
    • Abstract: Publication date: May 2019Source: International Journal of Rock Mechanics and Mining Sciences, Volume 117Author(s): Jian Yang, Li-Yun Fu, Weiqiang Zhang, Zhiwei Wang Experiments with ten groups of limestone specimens (four samples per group) under ten specific temperatures, 25 °C, 100 °C, 200 °C, 300 °C, 400 °C, 500 °C, 600 °C, 700 °C, 800 °C, and 900 °C, show that the high-temperature effect on the elastic modulus of rocks conforms to thermoelastic responses with a quadratic temperature function. The thermal damage factor can be reduced, by ignoring the effect of Poisson's ratios and densities, to simply a ratio of the P-wave velocities before and after high-temperature treatments. Based on the collected experimental data, we correlate the P-wave velocities change rate with both the peak compressive strength and effective solid matrix. It demonstrates that the high-temperature effect on the thermal damage factor can be directly expressed as the rate of change in the peak compressive strength and effective solid matrix. All these properties (thermal damage factor calculated by the P-wave velocity, peak compressive strength, and effective solid matrix) share a similar exponential trend with increasing temperature. The rates of change in the elastic modulus, P-wave velocity, peak compressive strength, and effective solid matrix also exhibit a similar powerful trend with increasing temperature. This study provides insight into the detailed characteristics of thermal damage related to the mechanical property of limestones exposed to high temperature.
       
  • Correlational fractal characterisation of stress and acoustic emission
           during coal and rock failure under multilevel dynamic loading
    • Abstract: Publication date: May 2019Source: International Journal of Rock Mechanics and Mining Sciences, Volume 117Author(s): H. Sun, X.L. Liu, J.B. Zhu The fractal characterisation of stress and acoustic emission (AE) of coal and rock failure may provide quantitative guidance for analysing the stability of rock mass during excavation engineering. The correlation between stress and AE data was calculated using fractal theory methods and Grassberger-Procaccia (G-P) algorithms to evaluate the damage and degree of flaw in coal and rock materials under multilevel dynamic loading (MDL). First, the mechanical properties of the testing device were developed to obtain synchronous data regarding the stress and AEs of coal and rock specimens under MDL. Second, strength deterioration behaviour and the Felicity effect during coal and rock failure are compared under different levels of dynamic loading. The results show that cumulative dynamic loading are less than the uniaxial compression strength of coal and rock. The Felicity effect is notable, and Felicity ratios decrease to 1 with increased loading velocity. Finally, stresses and AE signals are considered as the data mining specimens of correlation dimensions based on the G-P algorithm. Fractal characteristics on stress and AE coupling properties become more notable as the correlated dimensions become larger. However, the Felicity effect is less prominent, reflecting a lesser degree of damage and flaws in coal and rock materials. Therefore, this study suggests a data mining method for the correlation dimension to be applied in an in-situ monitoring system for rock mass excavation engineering.
       
  • Deformation and permeability evolution of coals considering the effect of
           beddings
    • Abstract: Publication date: May 2019Source: International Journal of Rock Mechanics and Mining Sciences, Volume 117Author(s): Chao Liu, Guangzhi Yin, Minghui Li, Delei Shang, Bozhi Deng, Zhenlong Song Coal belongs to sedimentary rock with obvious bedding planes. The existence of bedding weakens the continuity and integrity of coal. Deformation and permeability anisotropy of coals, to a certain extent, is attributed to the bedding planes. We performed experiments of deformation and permeability evolution of coals under true triaxial stress conditions. The experimental results indicate that the volumetric strain and bedding jointly affect permeability. An analytical model for stress-strain relationship of coals containing beddings is developed to quantify the bedding effects under true triaxial stress conditions. In the model, the deformation and permeability of the bedding and non-bedding are separated through bedding ratio and bedding elastic modulus. The bedding ratio is defined as the ratio of the total length of bedding to the total length of coal normal to bedding planes, which is a parameter closely related to the porosity. The elastic modulus is divided into four parts: a bedding elastic modulus and a non-bedding elastic modulus in the direction normal to bedding planes, and two elastic moduli in the direction parallel to bedding planes. The four elastic moduli are calculated by the analytical model. The bedding elastic modulus is relatively small, which shows that the bedding effect cannot be ignored. The permeability is highly sensitive to the bedding of coal with low stress in the direction normal to the bedding. The bedding ratio always affects the volumetric strain. The permeability of the coal is divided into bedding and non-bedding permeability. The ratio of the bedding permeability to the total permeability is different due to different stresses in the direction normal to bedding planes, which is linking with the compression of bedding. A permeability model which can reflect the different effects of beddings and non-beddings to the total permeability is proposed and verified.
       
  • An empirical method for determining the mechanical properties of jointed
           rock mass using drilling energy
    • Abstract: Publication date: April 2019Source: International Journal of Rock Mechanics and Mining Sciences, Volume 116Author(s): Mingming He, Ning Li, Zhiqiang Zhang, Xianchun Yao, Yunsheng Chen, Caihui Zhu Characterization of jointed rock masses and evaluation of their mechanical properties are challenging tasks in rock engineering. This paper presents an experimental investigation of the response characteristics of drilling energy to the discontinuity of rock mass using a drilling method. The linear relationship between the drilling energy and discontinuity frequency is revealed, which only depends on the rock type, and is independent of calculation units. A new empirical method for determining the rock quality designation (RQD) versus the variation of drilling energy is proposed based on the discontinuity frequency. Comparison between the prediction and in situ investigation results demonstrates that the RQD can be estimated from this empirical method. The Em/Er (modulus ratio) and σcm/σc (strength ratio) versus RQD relations are modified for the determination of rock mass strength and deformation modulus in order to consider the continuous variation of Em/Er and σcm/σc with the model parameter η, which is related to the drilling energy and modulus of elasticity of intact rock and the variation of drilling energy for rock mass. The results show that the modified Em/Er (σcm/σc) versus RQD relations can give proper values compared with the field test results as well as compared with the various proposed relations from RMR, Q and GSI. The modified relations can provide a practical, fast and easy-to-use method for the estimated rock mass strength and deformation modulus, but they are only a first approximation.
       
  • Ground motions induced by mining seismic events with different focal
           mechanisms
    • Abstract: Publication date: April 2019Source: International Journal of Rock Mechanics and Mining Sciences, Volume 116Author(s): Ju Ma, Longjun Dong, Guoyan Zhao, Xibing Li It is essential to quantify the ground motions induced by seismic events with different focal mechanisms in underground mine. To quantitatively calculate the induced ground motions, we expressed the motions as the convolution of the seismic source and the wave propagation path using seismological method. Firstly, we investigated the theoretical ground motion patterns using four idealized focal mechanisms. Results show that the pure compressional failure source and the pure tensional failure source induced the same ground motion patterns. The vibrations they induced attenuate extremely fast. The pure shear failure source shows closely azimuth related pattern with four quadrants around the source. The pure explosive failure source induces vibrations attenuating toward all directions away from the source. But the vibrations are not attenuated gradually with the increasing distance. Then, we investigated the ground motions under complicated focal mechanisms using recorded fault slip events, cavity collapse events, and tensional failure events. The fault slip events show a four quadrants ground motion distribution in the horizontal plane and a two quadrants distribution in the vertical plan. But the cavity collapse events show a two quadrants distribution in the horizontal plane and a four quadrants distribution in the vertical plane. It is concluded that the induced ground motion at a certain location is controlled by the dual effects of the azimuth and the source focal mechanism as well as the distance and the source magnitude.
       
  • The role of fractures, effective pressure and loading on the difference
           between the static and dynamic Poisson's ratio and Young's modulus of
           Westerly granite
    • Abstract: Publication date: April 2019Source: International Journal of Rock Mechanics and Mining Sciences, Volume 116Author(s): O.O. Blake, D.R. Faulkner, D.J. Tatham Fracture in rock is a major factor that affects the rock's elastic properties. Elastic properties can be measured statically during slow loading of a specimen, or dynamically, where the elasticity can be calculated using elastic-wave velocity. However, differences exist between the static and dynamic elastic properties. In this study, the dynamic and static elastic properties were measured under varying effective pressures and differential loads for dry and water-saturated Westerly granite that was thermally treated to 250, 450, 650 and 850 °C. Increasing the temperature produces an increased fracture density that is isotropically distributed. Increased fracture density results in a reduction in the Young's modulus and an increase in the Poisson's ratio, in both the static and dynamic cases, and is very significant for rocks treated above 450 °C. The dynamic Young's modulus is larger than the static value and the difference between them increases when water saturated. Under dry conditions, the static Young's modulus shows good correlation with dynamic values regardless of fracture density, loading or effective pressure. The static and dynamic Poisson's ratio are close to each other under both dry and saturated conditions. However, deviation between the static and dynamic Poisson's ratio occurs when the fracture density is high, differential load is high and effective pressure is low.
       
  • Effects of thermal treatment on physical and mechanical properties of
           Valdieri Marble - NW Italy
    • Abstract: Publication date: April 2019Source: International Journal of Rock Mechanics and Mining Sciences, Volume 116Author(s): Federico Vagnon, Chiara Colombero, Fabrizio Colombo, Cesare Comina, Anna Maria Ferrero, Giuseppe Mandrone, Sergio Carmelo Vinciguerra The effect of high temperatures as a degrading factor of rock materials is investigated in this study. Valdieri Marble samples, collected in a quarry in North-western Italian Alps, were subjected to thermal cycles (ranging from 105° to 600 °C) and to subsequent non-destructive and destructive laboratory tests with the aim of evaluating the variation of physical and mechanical properties as a function of temperature variations. Physical and mechanical measurements were complemented with microscopic observations on thin sections. The increase of crack density with temperature and the consequent porosity increases were found to be the main causes of degradation of physical and mechanical properties.In general, density, ultrasonic pulse velocity, wet electrical resistivity, uniaxial compressive strength and Young's moduli decrease as temperature increases. By contrast, peak strain and porosity increase. Correlations between temperature and physical-mechanical properties were proposed and compared to other relationships already established in scientific literature. A damage parameter to quantify the degradation of mechanical properties with temperature is also proposed.
       
  • Strainburst phenomena and numerical simulation of self-initiated brittle
           rock failure
    • Abstract: Publication date: April 2019Source: International Journal of Rock Mechanics and Mining Sciences, Volume 116Author(s): Fuqiang Gao, Peter K. Kaiser, Doug Stead, Erik Eberhardt, Davide Elmo This paper focuses on ‘self-initiated’ strainbursts, and starts by providing an overview of these phenomena and their relevance to mining. This is used to set the framework for the numerical simulations presented in the second part of the paper. The numerical simulations examine and address challenges in modelling strainbursts related to the inherent difficulties in dynamic failure simulation. Existing methods either simulate dynamic failure under static or pseudo-static conditions while adopting some threshold factor (normally in terms of stress, strain, or energy) as an indicator of rockburst potential, or incorporate an assumed dynamic disturbance to cause rockburst damage. A distinct-element bonded block method is presented to simulate strainbursts. Instead of triggering failure by an assumed dynamic disturbance, the adopted method simulates the generation of a seismic event by self-initiated rock mass fracturing. This simulation of a self-initiated strainburst is interpreted using patterns of cracking, displacement and strain fields, ground velocities, and calculated kinetic and dissipated slip energies. The mechanisms of self-initiated strainbursting are successfully captured by the distinct-element bonded block method.
       
  • Mechanical behaviors and acoustic emission fractal characteristics of coal
           specimens with a pre-existing flaw of various inclinations under uniaxial
           compression
    • Abstract: Publication date: April 2019Source: International Journal of Rock Mechanics and Mining Sciences, Volume 116Author(s): Dexing Li, Enyuan Wang, Xiangguo Kong, Muhammad Ali, Dongming Wang To study the influence of hydraulic slotting inclination on the mechanical behaviors of coal seam during mining process, uniaxial compression experiments on coal specimens with a single pre-existing flaw inclined at 0°, 15°, 30°, 45°, 60°, 75°, 90° and intact specimens were conducted. Acoustic emission (AE) signals in the loading process were monitored, and fractal analysis method was introduced to investigate the AE characteristics. Additionally, the laboratory experiments were simulated by a finite element code. Both the experimental and numerical results show that the existence of a flaw reduces the mechanical properties of coal. The uniaxial compressive strength and modulus of elasticity increase polynomially and linearly with the increase of inclination angle, respectively. When the coal specimen ruptures finally, the fewer the surface secondary cracks or the more the sudden drops of stress, the smaller the peak value of AE count. According to the stress–strain curve, the loading process is divided into five stages: (I) compaction stage; (II) linear elastic stage; (III) stable crack propagation stage; (IV) accelerating crack propagation stage; (V) post peak and residual stage. AE fractal characteristics in various stages of each specimen were determined by Grassberger and Procaccia algorithm based on phase space reconstruction theory. AE count show fractal characteristics from stage III. The fractal dimension declines rapidly in stage IV, and continues to decline further or rise slightly in stage V, but both are lower than that in stage III. Therefore, the changing rule of AE fractal dimension in different loading stages can be used as a precursor to coal and rock dynamic disasters.
       
  • A novel three-dimensional discrete fracture network model for
           investigating the role of aperture heterogeneity on fluid flow through
           fractured rock masses
    • Abstract: Publication date: April 2019Source: International Journal of Rock Mechanics and Mining Sciences, Volume 116Author(s): Na Huang, Yujing Jiang, Richeng Liu, Bo Li, Satoshi Sugimoto Effect of anisotropic aperture on the hydraulic properties of single rock fractures has been systematically investigated, yet the aperture variability of individual fractures in 3D discrete fracture networks (DFNs) is commonly negligible by using parallel-plate fractures. The present study proposed a 3D DFN model with fractures having heterogeneous apertures to estimate the influence of fracture variability on fluid flow. In total, a set of 1280 3D models with increasing fracture densities and fracture lengths are generated and the fluid flow through the models is simulated using a developed numerical code. The influences of aperture heterogeneity and network topology on the flow pattern and permeability of 3D DFNs are estimated. The results show that the network topology provides a first-order frame of geometrical connectivity, and the heterogeneous aperture further allows the flow to select some most transmissive channels within these connected fractures. The DFN model with identical apertures generates a large number of medium-flow rate regions whereas the DFN model with fractures having heterogeneous apertures results in extremely low- and high-flow rate regions. The permeability ratio of the two models is widely spread in terms of a small variation in the average mechanical aperture as a result of strong dependence on the aperture distribution. The average permeability ratio increases significantly first and then approaches to 1.0 with increasing the average mechanical aperture. This allows for the definition of a critical mechanical aperture, above which the permeability can be properly predicted using the DFN model with fractures having identical apertures and below which the permeability is much altered by the aperture variability and the DFN model with fractures having heterogeneous apertures should be employed.
       
  • Experimental study on pore-fracture evolution law in the thermal damage
           process of coal
    • Abstract: Publication date: April 2019Source: International Journal of Rock Mechanics and Mining Sciences, Volume 116Author(s): Yongliang Yang, Kaiyue Zheng, Zhiwei Li, Zenghua Li, Leilei Si, Shisong Hou, Yujian Duan High temperature causes thermal damage to coal and alters its physical and mechanical properties. In this paper, in order to study the influence of thermal damage on coal mechanical properties and pore-fracture development, uniaxial compression experiments were performed on coal samples treated under different temperatures. Meanwhile, the evolution law of coal fracture in the heating process was quantitatively studied from macroscopic and microscopic perspectives by using a CT scanning electron microscope (SEM), and evolution characteristics of coal pore structure under high temperature were tested and analyzed. In addition, the influence mechanism of thermal damage to the mine fire was discussed in combination with the characteristics of coal mine fire. The results show that the failure mode of coal sample changes from splitting failure to splitting-tensile combined failure and shear-tensile combined failure with the rise of temperature. As the temperature goes up, the number and length of fractures both grow, while the fracture rate and width increase first and then decrease. The porosity of coal exhibits an upward trend on the whole. Under the action of thermal damage, the internal micropore surfaces of coal become notably rougher. The high temperature thermal damage causes the formation of a loose area at the edge of fire area. This loose area not only affects the fracture field and airflow field of the fire area, but also further induces the fire to spread deeper. The research results can be used as a reference for on-site fire prevention work.Graphical abstractfx1
       
  • An experimental and theoretical stress-strain-damage correlation procedure
           for constitutive modelling of granite
    • Abstract: Publication date: April 2019Source: International Journal of Rock Mechanics and Mining Sciences, Volume 116Author(s): Thomas Bruning, Murat Karakus, Giang D. Nguyen, David Goodchild In this study, new theoretical and experimental stress-strain-damage correlation procedures for hard rock constitutive models are proposed. The damage-plasticity modelling framework is first supplied with the unified yield-failure criterion to describe the failure behaviour of granite under triaxial compression. This unified criterion allows the initial yield surface to evolve to a final failure surface through the utilisation of an appropriate damage evolution law. This evolution automatically captures the quasi-brittle behaviour of rocks under shearing at low confining pressure and ductile response under high confining pressure, as well as the transition from quasi-brittle to ductile reactions. In this theoretical sense, damage and plasticity are tightly coupled to govern the behaviour of rocks under different confining pressures without requiring any separate formulations for softening or hardening. Next, an innovative experimental correlation procedure is proposed to better link the experimental damage measure to stress states throughout triaxial loading. By obtaining full stress, strain and acoustic emission damage results from testing it was possible to construct a series of evolving yield surfaces from experiment. These surfaces, coupled with experimental damage evolution with respect to accumulated plastic strain, provide a comprehensive data set to a constitutive model for calibration. The results of numerical simulation show that this new method to incorporate coupled stress-strain-damage evolution characteristics directly from experiment removes the need for trial and error curve fitting. Also, by maintaining a closer link to detailed experimental results, the model is easier to calibrate and can be relied upon to predict the damage and stress states for compressive stress regimes. Finally, it is shown that the theoretical and experimental procedures can capture the key behaviours of granite under a range of confining pressures.
       
  • Corrigendum to “Experimental study of flow field structure of
           interrupted pulsed water jet and breakage of hard rock” [Int J Rock Mech
           Min Sci (2015) 253–261]
    • Abstract: Publication date: Available online 20 February 2019Source: International Journal of Rock Mechanics and Mining SciencesAuthor(s): Zhaohui Lu, Michael Hood, Dihon Tadic, Yong Liu, Jianping Wei, Ting Ren
       
 
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