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    Wyświetlanie 1-2 z 2
    Tytuł:
    Modeling of Post-Failure Behavior of the Rock Mass and its Effect on the Stress-Deformation State in the Vicinity of a Mining Excavation
    Autorzy:
    Marczak, Halina
    Powiązania:
    https://bibliotekanauki.pl/articles/102059.pdf
    Data publikacji:
    2019
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    rock mass model
    modeling of excavations
    strain and displacement
    stress analysis
    elastic-plastic model with strain-softening
    Mohr-Coulomb criterion
    inelastic zones
    model masy skalnej
    modelowanie wykopów
    odkształcenie i przemieszczenie
    analiza naprężenia
    model sprężysto-plastyczny z miękkim odkształceniem
    kryterium Mohra Coulomba
    strefy nieelastyczne
    Opis:
    The study investigated the impact of post-failure properties of the rock mass on the stress-deformation state in the vicinity of the underground excavation and the pressure exerted on the support. An analytical solution to the problem was presented, including the creation of inelastic zones in the vicinity of the excavation: ideal-plastic zone with residual strength and plastic zone with mild decrease of rock medium strength and taking into account the dilatancy. The analysis of the obtained dependencies was carried out using geotechnical parameters characterizing the Carboniferous rock mass of a hard coal mine. The influence of the plastic zone was determined with a mild decrease in strength to the state of stress, deformation and pressure on the rock mass support. The results of the considerations were compared with the solution, which omitted the softening of the rock mass and the solution based on the model of the elastic-plastic-brittle medium. The results of the analysis broaden the knowledge on the behavior of the rock medium in the vicinity of the excavation. The obtained solution can be further developed in order to enable its practical application, especially under the conditions in which the behavior of the rock medium in the vicinity of the excavation well reflects the elastic-plastic model with a gentle drop in the strength of the rock material.
    Źródło:
    Advances in Science and Technology. Research Journal; 2019, 13, 2; 130-140
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of the elastic-plastic model in the analysis of the displacement in a rock mass
    Autorzy:
    Marczak, Halina
    Powiązania:
    https://bibliotekanauki.pl/articles/102686.pdf
    Data publikacji:
    2018
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    state of displacement
    roadway
    elastic-plastic model
    response curve of the rock mass
    dilatation
    decreased strength of rock material
    reducing the strength of the rock material
    Coulomb-Mohr criterion
    stan przemieszczenia
    jezdnia
    model elastyczno-plastyczny
    krzywa reakcji górotworu
    dylatacja
    zmniejszona wytrzymałość materiału skalnego
    zmniejszenie wytrzymałości materiału skalnego
    Kryterium Coulomb-Mohr
    Opis:
    The concern of this article is the analysis of the impact of increased volume (dilation) and decreased strength of the rock material in the plastic zone on the displacement field in the vicinity of the roadway. Elastic-plastic model of the behaviour of the rock material and the strength criterion of Coulomb-Mohr were assumed. The volume change of the rock material is controlled by the angle of dilation ψ, which determines dilation parameter β that is taken into account in the analysis. The influence of parameter β and the strength of the rock material, after crossing the border state of stress, in the field of displacements in the vicinity of the excavation and rock pressure on the elastic support of the excavation was proved. The relationships determining displacement fields in the plastic zone which were obtained with consideration to in this zone of both the elastic and plastic displacement, as well as the relationships which were obtained without elastic deformations was discussed. The exact form of the equation for the displacement field in the plastic zone depends on how the elastic deformation in the plastic zone is defined. There are three ways of describing these deformations. In the first method it is assumed that in plastic deformation area the elastic deformation constants are equal to the deformation constants at the plastic and elastic border. The second method of description is based on the assumption that the plastic zone is a thick-walled ring whose edges: internal and external have been appropriately debited. In the third method, elastic deformations in the plastic zone were made dependent on the state of stress in the zone. The results are illustrated in a form of response curves of the rock mass.
    Źródło:
    Advances in Science and Technology. Research Journal; 2018, 12, 2; 188-196
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-2 z 2

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