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  • 1
    Publication Date: 2021-05-19
    Description: The relevance of the problem under study is based on the fact that dynamic fractures of mine workings occur in rock masses when developing mineral deposits. Safety assurance of mining depends on the awareness of proneness of various rock types to brittle failure. By now, experimental methods have been elaborated to determine rock deformation and strength properties under various loading conditions. A common drawback of the approaches in use is that they do not expressly consider the main condition of dynamic rock fracture – rock mass ability to accumulate energy when loaded. The studies have been conducted to analyze the nature of elastic energy accumulation during loading and deformation of samples of various rocks under uniaxial compression to estimate the degree of their rockburst hazard. The approach is original as it studies the deformation curve of rocks at the pre-peak stage that may be obtained with any standard equipment without the use of special-purpose test ("rigid") devices. Results of the studies conducted on standard test devices have allowed the authors to identify two different deformation patterns for the rock type tested with further establishment of criteria of rock classification by the degree of proneness to dynamic fractures. This approach is of practical value as it specifies the geomechanics zoning method of the rock mass and improves the assessment of rockburst hazard degree of specific areas at deposits being developed.
    Description: Актуальность проблемы определения степени удароопасности скальных горных пород обусловлена тем, что при разработке месторождений полезных ископаемых в скальных массивах происходят разрушения выработок в динамической форме. Основой обеспечения безопасности ведения горных работ являются знания о способности различных типов горных пород к хрупкому разрушению. В настоящее время разработаны экспериментальные методы установления деформационно-прочностных характеристик пород при различных режимах нагружения. Однако общий недостаток применяемых подходов заключается в том, что в них в явном виде не учтено главное условие возможности разрушения пород в динамической форме – способность массива пород накапливать энергию во время его нагружения. Целью проводимых исследований являлось изучение характера накопления упругой энергии в процессе нагружения и деформирования образцов различных пород в режиме одноосного сжатия для оценки степени их удароопасности. Оригинальность подхода заключалась в анализе вида кривой допредельного деформирования пород, которая может быть получена на любом стандартном оборудовании, т. е. без привлечения специализированных испытательных ("жестких") установок. По результатам проведенных исследований с использованием стандартных прессов были выявлены два режима деформирования для испытанных типов пород, что позволило сформулировать критерии отнесения пород к различным категориям по степени их склонности к разрушениям в динамической форме. Такой подход имеет практическую ценность, поскольку позволяет детализировать методику геомеханического районирования массива месторождений и более дифференцированно оценивать степень удароопасности конкретных участков разрабатываемых месторождений.
    Description: Published
    Keywords: Geomechanics ; Hard rocks ; Laboratory tests ; Uniaxial compression ; Rockburst hazard ; Deformation ; Elastic energy ; Standard test devices ; Геомеханика ; Скальные горные породы ; Лабораторные испытания ; Одноосное сжатие ; Удароопасность ; Деформирование ; Упругая энергия ; Стандартные прессы
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.138-148
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Pure and applied geophysics 147 (1996), S. 263-276 
    ISSN: 1420-9136
    Keywords: Seismicity ; rock bursts ; stresses ; mining operations ; monitoring ; geodynamic regime ; informative precursors
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Large volumes of rock mass, mined-out and moved within these deposits, resulted in irreversible changes in the geodynamic regime in the upper earth's crust of the adjacent territory. These changes manifest themselves in a more frequent occurrence of such intensive dynamic phenomena as tectonic rock bursts due to fault movement adjacent to the area which is mined-out and man-made earthquakes which sharply decrease mining safety and result in great material losses. To develop the prediction techniques of such phenomena, a monitoring system is created, based on the program of the Kola Complex of geodynamic measuring stations. Most of this system is realized in the region of the Khibiny apatite mines. The system provides regional seismological monitoring, local prediction of seismicity in separate areas of a rock mass and, determination of stress and strain in rock masses, local geophysical monitoring over the state of rocks in a rock mass as well as physical and mathematical modelling of geodynamic processes in the upper earth's crust. The investigations have resulted in the distinguishing of some regularities in manifestations of induced seismicity and tectonic rock bursts and in the determination of strain precursors of intensive seismic events in the Khibiny mines. The mechanism is provided by the induced seismicity which resulted from the anthropogenic impact on the geological medium. A geodynamic monitoring complex is described, which is used to reveal the precursors of powerful seismic eventsin situ, and monitoring results are shown, obtained in the Kola Complex of geodynamic stations. Methods of preventing tectonic rock bursts and induced earthquakes are presented.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1573-8353
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Representatives of a new class of mesogenic compounds have been synthesized, ω-(5-substituted-2-pyridyl)-4-alkylacetophenones, which have an intramolecular hydrogen bond. The mesogenic properties of these compounds have been investigated.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Journal of mining science 30 (1994), S. 543-547 
    ISSN: 1573-8736
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Journal of mining science 27 (1991), S. 495-506 
    ISSN: 1573-8736
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Journal of mining science 30 (1994), S. 447-455 
    ISSN: 1573-8736
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Conclusions 1. The stressed state of rock masses depends to a considerable extent on their block structure. There is no clear dependence for stresses on block geometric dimensions and shape. 2. A block nature for the rock mass increases the proportion of the largest ratio of principal stresses σ2/σ1 compared with a homogeneous rock mass at the same points. In other words in block masses the maximum tangential stresses are greater than in a homogeneous rock mass which promotes movement of blocks in relation to each other on a background of general equilibrium for a structure of a larger scale level. 3. A block structure for rock mass promotes reorientation of the principal stresses compared with a homogeneous rock mass.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Journal of structural chemistry 32 (1991), S. 774-776 
    ISSN: 1573-8779
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Journal of mining science 32 (1996), S. 18-25 
    ISSN: 1573-8736
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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  • 9
    Publication Date: 1989-05-01
    Print ISSN: 1062-7391
    Electronic ISSN: 1573-8736
    Topics: Geosciences , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Springer
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  • 10
    Publication Date: 2018-09-01
    Print ISSN: 1062-7391
    Electronic ISSN: 1573-8736
    Topics: Geosciences , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Springer
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