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Effects of overburden characteristics on dynamic failure in underground coal mining

International Journal of mining Science and Technology 2017年第1期27卷 121-129页

作者： Lawson Heather E. Tesarik Douglas Larson Mark K Abraham Habte NIOSH Office of Mine Safety and Health ResearchGround Control BranchSpokane WA 99207USA

Dynamic failures, or ‘‘bumps", remain an imperative safety concern in underground coal mining, despite significant advancements in engineering controls. The presence of spatially discrete, stiff roof units are one feature that has been linked to these events. However, an empirical stratigraphic review indicates that no significant difference exists in the relative commonality of discrete units between bumping and non-bumping deposits. Instead an apparent relationship exists between reportable bumping and the overall stiffness of the host rock. However, this initial study is too simplistic to be conclusive; to weight the relative impact of changes in a single variable, such as the thickness or location of sandstone members, it must be examined in isolation—i.e., in a setting where all other variables are held *** modelling provides this setting, and the effects of variability in a stiff discrete member in a hypothetical longwall mining scenario are investigated within the context of three stratigraphic ‘‘types",Compliant, Intermediate and Stiff. A modelling experiment examines changes in rupture potential in stiff roof units for each stratigraphic type as discrete unit thickness and location are manipulated through a range of values. Results suggest that the stiff-to-compliant ratio of the host rock has an impact on the relative stress-inducing effects of discrete stiff members. In other words, it is necessary to consider both the thickness and the distance to the seam, within the context of the host rock, to accurately anticipate areas of elevated rupture-induced hazard; acknowledging the presence of a discrete unit within the overburden in general terms is an insufficient indicator of risk. This finding helps to refine our understanding of the role of individual stiff, strong roof members in bumping phenomena, and suggests that a holistic view of overburden lithology and site-specific numerical modelling may be necessary to improve miner safety.

关键词： Dynamic failure coal mining Bumps Bounces

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Numerical simulation of spatial distributions of mining-induced stress and fracture fields for three coal mining layouts

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Journal of Rock Mechanics and Geotechnical Engineering 2018年第5期10卷 907-913页

作者： Shengwei Li Mingzhong Gao Xiaojun Yang Ru Zhang Li Ren Zhaopeng Zhang Guo Li Zetian Zhang Jing Xie State Key Laboratory of Hydraulics and Mountain River Engineering College of Water Resource and Hydropower Sichuan University State Key Laboratory for Geomechanics and Deep Underground Engineering China University of Mining and Technology MOE Laboratory of Deep Underground Science and Engineering College of Architecture and Environment Sichuan University China Three Gorges Projects Development Co. Ltd.

In this study, the spatial distributions of stress and fracture fields for three typical underground coal mining layouts, Le, non-pillar mining （NM）, top-coal caving mining （TCM） and protective coal-seam mining （PCM）, are modeled using discrete element software UDEC, The numerical results show that different mining layouts can lead to different mining-induced stress fields, resulting in diverse fracture fields, For the PCM, the mining influenced area in front of the mining faces is the largest, and the stress concentration factor in front of the mining faces is the lowest, The spatial shapes of the mining-induced fracture fields under NM, TCM and PCM differ, and they are characterized by trapezoidal, triangular and tower shapes, respectively, The fractal dimensions of mining-induced fractures of the three mining layouts decrease in the order of PCM, TCM and NM, It is also shown that the PCM can result in a better gas control effect in coal mines with high outburst potential, The numerical results are expected to provide a basis for understanding of mining-induced gas seepage fields and provide a reference for high- efficiency coal mining,

关键词： coal mining mining layouts mining-induced stress field mining-induced fracture field Numerical simulation

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Occurrence,leaching,and mobility of major and trace elements in a coal mining waste dump:The case of Douro coalfield,Portugal

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Energy Geoscience 2021年第2期2卷 121-128页

作者： J.Ribeiro D.Flores Department of Earth Sciences University of CoimbraRua Silvio Lima3030-790CoimbraPortugal Institute of Earth Sciences-Porto Pole Rua Do Campo Alegre 6874169-007PortoPortugal Environment and Spatial Planning Department of GeosciencesUniversity of PortoRua Do Campo Alegre 6874169-007PortoPortugal

The coal mining residues from past mining activities in the Douro coalfield are emplaced in many dumps near the mining areas,causing substantial environmental *** study aims to contribute to the investigation of environmental impacts caused by the disposal of the residue in the Douro coalfield through the determination of the geochemical composition of waste materials collected at 3 e 15 m depth,and of the water-leachable fraction produced by percolation in these materials inside the *** elements with higher concentration in the leachates are Ca,Cd,Co,Mg,Mn,Na,Ni,S,and Zn,indicating that they are the most easily leached and accessible elements for percolation and mobilization into the *** presence of these elements in the leachates is principally attributed to their occurrence as water-soluble ions in clays and sulphides affected by natural weathering conditions,which promotes their breakdown and occurrence as exchangeable *** leachates are classified as acid *** weathering and leaching in the Sao Pedro da Cova waste dump are the principal~paths for chemical elements to be percolated and mobilized to environment,posing risk to the soils,waters and ecosystems in the surrounding areas.

关键词： coal mining Waste dump Water-soluble compound Hazardous element

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EFFECT OF coal mining ON RIVER SEDIMENTATION-A Case Study From The Shengfu-Dongsheng coal FieldIn The Loess Plateau, North China

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International Journal of Sediment Research 1999年第2期14卷 363-370页

作者： Chang-xing JIN Lian-yuan YOU (USDA-ARS-National Sedimentation laboratory, Oxford, MS,38655.USA Institute of Geography, Chinese Academy of Sciences, Beijing, 100101, China)

The Shengfu- dongsheng coal field is the largest coal field in China. Since the field is ill the ecologically vulnerable area of the Loess Plateau, the environmental problems caused by mining are of great concern. In this paper, the impact of coal mining on river sedimentation was studied from hydrologic record, measurements of channel deposition, and sample analysis of deposits. Results show that mining has changed the suspended sediment concentrations, sediment discharges, sediment deposition in rivers and profiles significantly.

关键词： coal mining River sedimentation Shengfu-dongsheng

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Time-lapse geophysical technology-based study on overburden strata changes induced by modern coal mining

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International Journal of coal Science & Technology 2014年第2期1卷 184-191页

作者： Wenfeng Du Suping Peng Guowei Zhu Feng Yang State Key Laboratory of coal Resources and Safe mining China University of Mining and TechnologyBeijing 100083China

To study the impact of modern coal mining on overlying strata and its water bearing conditions,integrated time-lapse geophysical prospecting integrating 3D seismic,electrical and ground penetrating radar method were *** observing and analyzing the geophysical data variations of all stages of pre-mining,mining and post-mining as well as post-mining deposition stable period,impacts of coal mining on stratigraphic structure and its water bearing were studied and modern coal mining induced stratigraphic change pattern was *** research result shows that the stratigraphic structure and the water bearing of surface layer during modern coal mining have self-healing pattern with mining time;the self-healing capability of near-surface strata is relatively strong while the roof weak;water bearing selfhealing of near-surface strata is relatively high while the roof strata adjacent to mined coal beds *** to integrated time-lapse geophysical prospecting technology has extra time dimension which makes up the deficiency of static analysis of conventional geophysical methods,it can better highlight the dynamic changes of modern coal mining induced overburden strata and its water bearing conditions.

关键词： Time lapse Geophysical prospecting coal mining Overburden strata Strata changes Modern coalmining

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Quantifying the emission＇s impact of coal mining activities on the environment and human health in process

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Journal of coal Science & Engineering(China) 2013年第3期19卷 421-426页

作者： Dan JIN Zheng-Fu BIAN School of Management China University of Mining and Technology Xuzhou 221116 China Jiangsu Key Laboratory of Resources and Environmental Information Engineering China University of Mining and Technology Xuzhou 221116 China

Discharges and emissions in the coal mining process have a strong effect both on the environment and on human health. This problem is usually be a negative one and has only been recognized qualitatively, due to the lack of effective quantitative methods. Based on emergy theory and accounting methodology, a set of quantitative methods for accounting the environmental support due to pollutants emissions was first introduced. Then impacts on environment and effects on human health were quantified using the unified units. The results indicated that water pollutants caused more impacts on the environment than air pollutants did, i.e., more environmental contributions are needed to dilute and absorb water pollutants. The occupation of land caused by coal mining gangue waste stacking has led to a huge loss of environmental services over the years. Moreover, the potential damage on the human condition health caused by CO2 through climate change cannot be ignored. Finally, the impacts of mining activities on environmental and human health in unified units are shown to provide a quantitative insight into the disadvantage of coal mining. The comparable results of the method indicate the different influence of various pollutants and the contribution of ＇natural capital＇ directly. This work is a part of ongoing thermodynamic input-output analysis and life cycle analysis of coal mining systems （which are in process.）

关键词： emergy accounting pollutants emission environmental support coal mining

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Compaction and seepage characteristics of broken coal and rock masses in coal mining:A review in laboratory tests

Rock Mechanics Bulletin

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Rock Mechanics Bulletin 2024年第2期3卷 1-20页

作者： Cun Zhang Yanhong Chen Zhaopeng Ren Fangtian Wang School of Energy and mining Engineering China University of Mining and Technology(Beijing)Beijing 100083China Engineering Research Center of Green and Intelligent mining for Thick coal Seam Ministry of EducationBeijing 100083China School of Mines China University of Mining&TechnologyXuzhou221116China

Broken coal and rock(BCR)are an important component medium of the caving zone in the goaf(or gob),as well as the main filling material of fault fracture zone and collapse *** compaction seepage characteristics of BCR directly affect the safe and efficient mining of coal ***,numerous laboratory studies have focused on the compaction seepage characteristics of *** paper first outlines the engineering problems involved in the BCR during coal mining including the air leakage,the spontaneous combustion,the gas drainage,and the un-derground reservoirs in the *** inrush related to tectonics such as faults and collapse columns and surface subsidence related to coal gangue filling and mining also involve the compaction seepage characteristics of *** on the field problems of BCR,many attempts have been made to mimic field environments in laboratory *** experimental equipment(cavity size and shape,acoustic emission,CT,etc.)and experimental design for the BCR were firstly *** main objects of laboratory analysis can be divided into compression tests and seepage *** the compaction test,the main research focuses on the bearing deformation characteristics(stress-strain curve),pore evolution characteristics,and re-crushing characteristics of *** seepage test mainly uses gas or water as the main medium to study the evolution characteristics of permeability under different compaction stress *** the laboratory tests,factors such as the type of coal and rock mass,particle size,particle shape,water pressure,temperature,and stress path are usually *** lateral compression test of BCR can be divided into three stages,including the self-adjustment stage,the broken stage,and the elastic stage or stable *** each stage,stress,deformation,porosity,energy,particle size and breakage rate all have their own *** test regarding the water permeability experiment of BCR is actually belong to variabl

关键词： coal mining Broken coal and rock Laboratory test Engineering problems Experimental equipment Breakage characteristics Compaction characteristics Seepage characteristics

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Hazard identification for equipment-related fatal incidents in the *** coal mining

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Journal of coal Science & Engineering(China) 2009年第1期15卷 1-6页

作者： VladislavKecojevic ZainalabidinMdNor The Pennsylvania State University Philadelphia PA 16802-5000USA

Based on the number of fatalities per year, a persistent area of concern in mine safety continues to be equipment related. Data from the period 1995 through 2007 were studied in order to identify major hazards for underground mining equipment-related fatal incidents and to perform an analysis of those that occurred over the last 13 years. Reports on equipment-related fatal incidents were obtained from the Mine Safety and Health Administration （MSHA）. The results show that underground mining equipment including continuous miner, shuttle car, roof bolter, load-haul-dump （LHD）, Iongwall and hoisting contributed to a total of 69 mining-related fatalities. The study reveals that the major hazard for continuous mining equipment-related fatal incidents is ＂Failure of victim to respect equipment working area＂, while the highest number of fatalities for shuttle car is attributed to the hazard ＂Failure of mechanical components.＂ The study further reveals that the highest number of fatalities for roof bolter, LHD, and Iongwall are attributed to the hazards ＂Working under unsupported roof＂, ＂Failure of management to provide safe working conditions＂, and ＂Failure of mechanical components＂, respectively. It is determined that one fatality for the hoisting system is attributed to the hazard ＂Failure of mechanical components＂ and one to the hazard ＂Failure to follow safe maintenance procedure＂. Finally, approaches to prevention were also discussed in this paper.

关键词： coal mining safety equipment fatal incidents hazard

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Research on the sudden changes and the controlling factors of deep coal mining conditions

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Journal of coal Science & Engineering(China) 2008年第3期14卷 347-351页

作者：虎维岳董书宁 Xi'an Branch China Coal Research InstituteXi'an 710054China

It was illustrated that the mining conditions inducing disasters changed with depth both in regularity of gradual and sudden *** sudden change depth for different disaster conditions are different and controlled by different *** high temperature and its change with depth are mainly controlled by strata structures and rock heat conductiv- ity property,the high rock stress and dynamical engineering disasters and their change with depth are mainly controlled by tectonic conditions,roof strata rock property and deep rock mechanical property,coal mine water disasters and their change with depth are mainly con- trolled by rock mechanical property of coal seam floor and regional groundwater circulation conditions,gas disaster conditions and their change with depth are mainly controlled by buried conditions of coal seam and opening conditions of geological *** is men- tioned that the key point for the control of deep coal mining disaster is to clearly understand the sudden change depth of different factors causing disasters.

关键词： suddenly change controlling factor coal mining geological disaster

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Environmental problems in a coal mining area affected by coal fires——A case study in Ruqigou coalfield,Ningxia,China

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Journal of Environmental Sciences 1999年第1期11卷 27-36页

作者： Chen Li ding Research Center for Eco Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China

１ＩｎｔｒｏｄｕｃｔｉｏｎＡｓｏｎｅｏｆｔｈｅｍｏｓｔｉｍｐｏｒｔａｎｔｓｏｕｒｃｅｓｆｏｒｐｏｗｅｒｇｅｎｅｒａｔｉｏｎ，ｃｏａｌｍｉｎｉｎｇｉｎｄｕｓｔｒｙｉｓｓｔｉｌｉｎｃｒｅａｓｉｎｇｗｉｔｈｐｏｐｕｌａｔｉ... 详细信息

１ＩｎｔｒｏｄｕｃｔｉｏｎＡｓｏｎｅｏｆｔｈｅｍｏｓｔｉｍｐｏｒｔａｎｔｓｏｕｒｃｅｓｆｏｒｐｏｗｅｒｇｅｎｅｒａｔｉｏｎ，ｃｏａｌｍｉｎｉｎｇｉｎｄｕｓｔｒｙｉｓｓｔｉｌｉｎｃｒｅａｓｉｎｇｗｉｔｈｐｏｐｕｌａｔｉｏｎｇｒｏｗｔｈａｎｄｅｃｏｎｏｍ...

关键词： Ruqigou coalfield coal mining coal fire environmental problems land degradation.

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