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Applying robust design to study the effects of stratigraphic characteristics on brittle failure and bump potential in a coal mine

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International Journal of Mining Science and Technology 2018年第1期28卷 137-144页

作者： Bo-Hyun Kim Mark K.Larson heather e.lawson Spokane Mining Research Division NIOSH/CDC

Bumps and other types of dynamic failure have been a persistent, worldwide problem in the underground coal mining industry, spanning *** example, in just five states in the *** 1983 to 2014,there were 388 reportable *** significant advances in mine design tools and mining practices,these events continue to *** conditions have been associated with bump potential, such as the presence of stiff units in the local *** effect of a stiff sandstone unit on the potential for coal bumps depends on the location of the stiff unit in the stratigraphic column, the relative stiffness and strength of other structural members, and stress concentrations caused by *** study describes the results of a robust design to consider the impact of different lithologic risk factors impacting dynamic failure *** the inherent variability of stratigraphic characteristics in sedimentary formations,such as thickness, engineering material properties, and location, is significant and the number of influential parameters in determining a parametric study is large, it is impractical to consider every simulation case by varying each parameter ***, to save time and honor the statistical distributions of the parameters, it is necessary to develop a robust design to collect sufficient sample data and develop a statistical analysis method to draw accurate conclusions from the collected *** this study,orthogonal arrays, which were developed using the robust design, are used to define the combination of the(a) thickness of a stiff sandstone inserted on the top and bottom of a coal seam in a massive shale mine roof and floor,(b) location of the stiff sandstone inserted on the top and bottom of the coal seam,and(c) material properties of the stiff sandstone and contacts as interfaces using the 3-dimensional numerical model, *** completion of the numerical experiments, statistical and multivariate analysis are performed using

关键词： Bumps Robust design FLAC3D Plastic dissipated energy Multiple regression

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User-friendly finite element design of main entries, barrier pillars,and bleeder entries

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International Journal of Mining Science and Technology 2018年第1期28卷 3-10页

作者： William G.Pariseau Mark K.Larson heather e.lawson Douglas R.Tesarik Department of Mining engineering University of Utah Spokane Mining Research Division NIOSH

This contribution describes development and application of a user-friendly finite element program,UT3PC, to address three important problems in underground coal mine design:(1) safety of main entries,(2) barrier pillar size needed for entry protection, and(3) safety of bleeder entries during the advance of an adjacent longwall *** the finite element method is by far the most popular engineering design tool of the digital age, widespread use by the mining community has been impeded by the relatively high cost of and the need for lengthy specialized training in numerical *** of UT3PC overcomes these impediments in three easy ***, a material properties file is prepared for the considered ***, mesh generation is automatic through an interactive process.A third and last step is simply execution of the *** using data from several western coal mines illustrate the ease of using the application for analysis of main entries, barrier pillars, and bleeder entry safety.

关键词： Finite element Coal Mine layout design Main entries Barrier pillars Bleeder entries

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Lack of evidence for germline WWP1 pathogenic variants in gastrointestinal polyposis and other phenotypes suggestive of PTeN-hamartoma-tumor syndrome

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Genes & Diseases 2024年第2期11卷 524-527页

作者： Noemi Gonzalez-Abuin Tirso Pons Teresa Fuster Isabel Quintana Mariona Terradas Gemma Aiza Joan Brunet Gabriel Capellá heather Hampel Laura Valle Hereditary Cancer Program Catalan Institute of OncologyOncobell ProgramIDIBELLHospitalet de LlobregatBarcelona 08908Spain Department of Immunology and Oncology National Center for BiotechnologySpanish National Research Council (CNB-CSIC)Madrid 28049Spain Centro de Investigación Biomédica en Red de Cáncer (CIBeRONC) Madrid 28029Spain Catalan Institute of Oncology IDIBGiGirona 17007Spain Division of Clinical Cancer Genomics Department of Medical Oncology & Therapeutic ResearchCity of Hope National Cancer CenterDuarteCA 91010USA

Germline activating variants in WWP1,which encodes an e3 ubiquitin ligase that antagonizes PTeN tumor suppressive function,have been proposed as an alternative mechanism of PTeN inactivation in PTeN-hamartoma-tumor syndrome(PHTS)-like patients with wildtype PTeN.1 More specifically,heterozygous,potentially activating wwP1 variants were first identified by Lee et al in patients affected with gastrointestinal oligopolyposis,including adenomatous,hyperplastic/serrated,and hamartomatous polyps,and occasionally with colorectal cancer(Table 1).Subsequently,based on the PHTS phenotypic features,wWP1 mutational screening was performed in patients with thyroid nodules,2 or normocephalic autism spectrum disorder(ASD),3 where germline WWP1 variants were also identified(Table S1).

关键词： WWP1 gastrointestinal polyposis

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exploration of petrographic,elemental,and material properties of dynamic failure-prone coals

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International Journal of Mining Science and Technology 2020年第1期30卷 69-75页

作者： heather lawson Spokane Mining Research Division National Institute for Occupational Safety and HealthSpokaneWA 99207USA

The purpose of this study is to explore how the geochemical and petrographic components of coal may impact its physical properties and how these correlate with a history of reportable dynamic failure in coal *** failure events,also termed bumps,bounces,or bursts,are the explosive failures of rock in a mining *** events occur suddenly and often with no warning,resulting in worker injury up to and including fatality in greater than 60%of reportable cases through the Mine Safety and Health Administration(MSHA).A database of variables was compiled using publicly available datasets,which includes compositional geographic,strength,and Hardgrove grindability index(HGI)*** indicated that bumping coals were less mature,lower in carbon,higher in oxygen,softer,and less well cleated than coals that did not *** liptinite content was found to correlate with higher average uniaxial compressive strength(UCS)***,no clear and direct correlation between UCS and dynamic failure status was *** findings of this study established that differences existed between coals that had versus had not experienced reportable dynamic failure *** differences were inherent to the coal itself and were independent of mining-induced risk *** further illuminated how compositional attribute of coal influenced physical properties and began to clarify potential links between geochemistry and dynamic failure *** through the better understanding of risk can more effective mitigating strategies be enacted.

关键词： Dynamic failure Coal Bump Bounce Burst

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effects of overburden characteristics on dynamic failure in underground coal mining

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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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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 ***-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 *** information to mine operators is a priority,as the conference goal is to offer solutions-oriented *** addition,the conference has included innovative technologies and ideas in miningrelated fields such as exploration,geology,and surface and underground mining in all *** new ground control technologies and design standards adopted by the mining industry were first discussed at *** 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 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 *** 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 *** information to mine operators is a priority,as the conference goal is to offer solution-oriented *** addition,the conference has included innovative technologies and ideas in mining-related fields such as exploration,geology,and surface and underground *** new ground control technologies and design standards adopted by the mining industry were first discussed at ***,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 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 ***-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 *** information to mine operators is a priority,as the conference goal is to offer solutions-oriented *** addition,the conference has included innovative technologies and ideas in miningrelated fields such as exploration,geology,and surface and underground mining in all *** new ground control technologies and design standards adopted by the mining industry were first discussed at ***,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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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

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 37 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。

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

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Dynamic failure in coal seams Implications of coal composition for bump susceptibility

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International Journal of Mining Science and Technology 2016年第1期26卷 3-8页

作者： lawson heather Weakley Andrew Miller Arthur Office of Mine Safety and Health Research NIOSHSpokane 99207USA Department of Chemical and Materials engineering University of IdahoBoise 83705USA

As a contributing factor in the dynamic failure(bumping) of coal pillars,a bump-prone coal seam has been described as one that is ‘‘uncleated or poorly cleated,strong...that sustains high stresses."Despite extensive research regarding engineering controls to help reduce the risk for coal bumps,there is a paucity of research related to the properties of coal itself and how those properties might contribute to the mechanics of failures. Geographic distribution of reportable dynamic failure events reveals a highly localized clustering of incidents despite widespread mining activities. This suggests that unique,contributing geologic characteristics exist within these regions that are less prevalent elsewhere. To investigate a new approach for identifying coal characteristics that might lead to bumping,a principal component analysis(PCA) was performed on 306 coal records from the Pennsylvania State Coal Sample database to determine which characteristics were most closely linked with a positive history of reportable bumping. Selected material properties from the data records for coal samples were chosen as variables for the PCA and included petrographic,elemental,and molecular properties. Results of the PCA suggest a clear correlation between low organic sulfur content and the occurrence of dynamic failure,and a secondary correlation between volatile matter and dynamic failure phenomena. The ratio of volatile matter to sulfur in the samples shows strong correlation with bump-prone regions,with a minimum threshold value of approximately 20,while correlations determined for other petrographic and elemental variables were more ambiguous. Results suggest that the composition of the coal itself is directly linked to how likely a coal is to have experienced a reportable dynamic failure event. These compositional controls are distinct from other previously established engineering and geologic criteria and represent a missing piece to the bump prediction puzzle.

关键词：动态破坏煤体磁化率煤组分主成分分析工程控制宾夕法尼亚州分子特性

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