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Correlations between mineral composition and mechanical properties of granite using digital image processing and discrete element method

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矿业科学技术学报:英文版 2023年第8期33卷 949-962页

作者： Changdi He brijes mishra Qingwen Shi Yun Zhao Dajun Lin Xiao Wang Department of Mining Engineering University of UtahSalt Lake City 84112USA College of Mine Safety North China Institute of Science and TechnologyLangfang 065201China Department of Mining Engineering West Virginia UniversityMorgantown 26506USA Department of Electrical and Computer Engineering University of UtahSalt Lake City 84112USA College of Energy and Mining Engineering Shandong University of Science and TechnologyQingdao 266590China

This study investigated the correlations between mechanical properties and mineralogy of granite using the digital image processing(DIP) and discrete element method(DEM). The results showed that the X-ray diffraction(XRD)-based DIP method effectively analyzed the mineral composition contents and spatial distributions of granite. During the particle flow code(PFC2D) model calibration phase, the numerical simulation exhibited that the uniaxial compressive strength(UCS) value, elastic modulus(E), and failure pattern of the granite specimen in the UCS test were comparable to the experiment. By establishing 351 sets of numerical models and exploring the impacts of mineral composition on the mechanical properties of granite, it indicated that there was no negative correlation between quartz and feldspar for UCS, tensile strength(σ_(t)), and E. In contrast, mica had a significant negative correlation for UCS, σ_(t), and E. The presence of quartz increased the brittleness of granite, whereas the presence of mica and feldspar increased its ductility in UCS and direct tensile strength(DTS) tests. Varying contents of major mineral compositions in granite showed minor influence on the number of cracks in both UCS and DTS tests.

关键词： Granite Digital image processing Discrete element method Mineral composition Mechanical properties

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Understanding the influence of petrographic parameters on strength of differently sized shale specimens using XRD and SEM

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International Journal of Mining Science and Technology 2021年第5期31卷 953-961页

作者： Debashis Das brijes mishra Neel Gupta RESPEC LexingtonKY 40508USA West Virginia University MorgantownWV 26506USA

Ground failure is a major contributor to fatalities in underground mines in the US.Underground coal mines in the Northern Appalachian have weak roof rock composed of shale,which is prone to failure under high horizontal stress.Understanding the relationship among strength,specimen size and rock petrographic parameters is essential for developing an effective ground control plan.Size effect studies have found that rock strength varies with specimen size.This paper attempts to understand this strength variation using three specimen sizes(254-mm,508-mm,and 762-mm).The specimen strength was measured and the major petrographic parameters affecting the strength,namely grain size,grain shape,quartz content,clay content,etc.were analyzed using X-ray diffraction(XRD)and scanning electron microscopy(SEM).The petrographic parameters were then correlated with the strength of the three differently sized specimens.The results showed that 508-mm specimen had the lowest strength.Quartz content of the 508-mm specimen was lower than that of 254-mm and 762-mm specimens.Clay content and average grain size of the 508-mm specimen were higher than those of 254-mm and 762-mm specimens.These results clearly show that grain size,quartz content and clay content contribute to strength variation observed in differently sized shale specimens.

关键词： Shale strength XRD(X-ray diffraction) SEM(scanning electron microscopy) Grain size Quartz content Grain shape

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Numerical investigation on the caving mechanism with different standard deviations of top coal block size in LTCC

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International Journal of Mining Science and Technology 2020年第5期30卷 583-591页

作者： Jiachen Wang Weijie Wei Jinwang Zhang brijes mishra Ang Li State Key Laboratory Coal Resources and Safe Mining China University of Mining and Technology-BeijingBeijing 100083China School of Energy and Mining Engineering China University of Mining and Technology-BeijingBeijing 100083China Coal Industry Engineering Research Center of Top-coal Caving Mining Beijing 100083China Department of Mining Engineering West Virginia UniversityMorgantownWV 26505USA

The size distribution of the broken top coal blocks is an important factor,affecting the recovery ratio and the efficiency of drawing top coal in longwall top coal caving(LTCC)mining panel.The standard deviation of top coal block size(dt)is one of the main parameters to reflect the size distribution of top coal.To find the effect of dt on the caving mechanism,this study simulates experiments with 9 different dt by using discrete element software PFC.The dt is divided into two stages:uniform distribution stage(UDS)whose dt is less than 0.1(Schemes 1–5),and nonuniform distribution stage(NDS)whose dt is more than 0.1(Schemes 6–9).This research mainly investigates the variation of recovery ratio,drawing body shape,boundary of top coal,and contact force between particles in the two stages,respectively.The results showed that with the increasing dt,the recovery ratio of the panel increases first and then decreases in UDS.It is the largest in Scheme 3,which mainly increases the drawing volume at the side of starting drawing end.However,the recovery ratio decreases first and then increases quickly in NDS,and it is the largest in Scheme 9,where the drawing volume at the side of finishing drawing end are relatively higher.In UDS,the major size of top coal is basically medium,while in NDS,the size varies from medium to small,and then to large,with a distinct difference in shape and volume of the drawing body.When the major size of top coal is medium and small,the cross-section width of the initial boundary of top coal at each height is relatively small.Conversely,when the top coal size is large,the initial boundary of top coal has a larger opening range,the rotating angle of lower boundary is relatively small in the normal drawing stage,which is conducive to the development of drawing body and reduces the residual top coal,and the maximum particle velocity and the particles movement angle are both larger.This study lays a foundation for the prediction of recovery ratio,and suggests that the uniform top coal is more manageab

关键词： Longwall top coal caving mining Standard deviation of top coal size Recovery ratio Drawing body Boundary of top coal Contact force

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Guest editorial–Special issue on ground control in mining in 2017

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International Journal of Mining Science and Technology 2018年第1期28卷 1-2页

作者： Michael M.Murphy brijes mishra Kyle Perry Heather Lawson Pittsburgh Mining Research Division NIOSH Mining Engineering West Virginia University Mining&Nuclear Engineering Missouri S&T Spokane Mining Research Division NIOSH

Ground control is the science of studying and controlling the behavior of rock strata in response to mining operations.Ground control-related research has seen significant advancements over the last 36 years,and these accomplishments are well documented in the proceedings of the annual International Conference on Ground Control in Mining(ICGCM)[1].The ICGCM is a forum to promote closer communication among researchers,consultants,regulators,manufacturers,and mine operators to expedite solutions to ground control problems in mining[2–8].Fundamental research and advancements in ground control science define the central core of the conference mission.Providing information to mine operators is a priority,as the conference goal is to offer solution-oriented information.In addition,the conference has included innovative technologies and ideas in mining-related fields such as exploration,geology,and surface and underground mining.Many new ground control technologies and design standards adopted by the mining industry were first discussed at ICGCM.Therefore,this conference is recognized as the best forum for introducing new ground control-related research and products.

关键词： Guest controlling exploration response surface forum strata ideas

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Guest editorial–special issue on ground control in mining in 2020

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International Journal of Mining Science and Technology 2021年第1期31卷 1-2页

作者： Michael M.Murphy Ted Klemetti Heather Lawson brijes mishra Kyle Perry CDC NIOSH PittsburghPA 15236USA CDC NIOSH SpokaneWA 99207USA Department of Mining Engineering West Virginia UniversityMorgantown 26501USA Department of Mining Engineering Missouri University of Science and TechnologyRollaMO 65409USA

Ground control is the science of studying and controlling the behavior of rock strata in response to mining operations.Ground-control-related research has seen significant advancements over the last 40 years,and these accomplishments are well documented in the proceedings of the annual International Conference on Ground Control in Mining(ICGCM)[1].The ICGCM is a forum to promote closer communication among researchers,consultants,regulators,manufacturers,and mine operators to expedite solutions to ground control problems in mining[2–7].Fundamental research and advancements in ground control science define the central core of the conference mission.Providing information to mine operators is a priority,as the conference goal is to offer solutions-oriented information.In addition,the conference has included innovative technologies and ideas in miningrelated fields such as exploration,geology,and surface and underground mining in all commodities.Many new ground control technologies and design standards adopted by the mining industry were first discussed at ICGCM.This conference is recognized as the leading international forum for introducing new ground-control-related research and products.

关键词： operators closer accomplishment

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Guest editorial-special issue on ground control in mining in 2018

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International Journal of Mining Science and Technology 2019年第1期29卷 1-2页

作者： Michael M.Murphy Ted Klemetti Heather Lawson brijes mishra Kyle Perry Pittsburgh Mining Research Division NIOSH Spokane Mining Research Division NIOSH Mining Engineering West Virginia University Mining&Nuclear Engineering Missouri S&T

关键词： NIOSH Guest editorial-special issue on ground control in mining in 2018

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Guest editorial-special issue on ground control in mining in 2019

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International Journal of Mining Science and Technology 2020年第1期30卷 1-2页

作者： Michael M.Murphy Ted Klemetti Heather Lawson brijes mishra Kyle Perry Pittsburgh Mining Research Division NIOSHPittsburghPA 15228USA Spokane Mining Research Division NIOSHSpokaneWA 99207USA Mining Engineering West Virginia UniversityMorgantownWV 26506USA Mining&Nuclear Engineering Missouri S&TRollaMO 65409USA

Ground control is the science of studying and controlling the behavior of rock strata in response to mining operations.Ground-control-related research has seen significant advancements over the last 39 years,and these accomplishments are well documented in the proceedings of the annual International Conference on Ground Control in Mining(ICGCM)[1].The ICGCM is a forum to promote closer communication among researchers,consultants,regulators,manufacturers,and mine operators to expedite solutions to ground control problems in mining[2–7].Fundamental research and advancements in ground control science define the central core of the conference mission.Providing information to mine operators is a priority,as the conference goal is to offer solutions-oriented information.In addition,the conference has included innovative technologies and ideas in miningrelated fields such as exploration,geology,and surface and underground mining in all commodities.Many new ground control technologies and design standards adopted by the mining industry were first discussed at ICGCM.Therefore,this conference is recognized as the best international forum for introducing new groundcontrol-related research and products.

关键词： operators closer accomplishment

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Stability analyses of bleeder pillars in longwall mines by displacement-discontinuity method

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International Journal of Mining Science and Technology 2015年第6期25卷 933-941页

作者： mishra brijes Tang Xu Department of Mining Engineering West Virginia University Department of Mining and Minerals Engineering Virginia Polytechnic Institute and State University

Caving in coal mines releases significant amounts of dust and gas. This is exhausted from the mine by forcing the air to travel through the caved zones into a set of roadways known as bleeders. These bleeder entries are operated for the life of the mine, and therefore, they have to be kept in stable condition. Caving operations in coal mines are associated with longwall mines and complete pillar extraction. The pillars adjoining the caved zone sometimes show rib failures, posing a hazard for mine personnel travelling through the entry. In this paper, we present the results from analyses of bleeder pillars that are near the caved zones and are susceptible to damage because of the transfer of load during the caving process.In this study, bleeder pillars were simulated in a displacement discontinuity program. Results showed that the vertical stresses on bleeder pillars increased while the safety factor of bleeder pillar decreased during the caving process; however, when the caved zone completely consolidated, both the stresses and safety factor did not change for the remaining extraction. When similar extraction was performed at deeper depths, vertical stress on pillars increased significantly.

关键词：稳定性分析位移不连续法矿山放气矿柱采场开采过程垂直应力

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