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    Wyświetlanie 1-7 z 7
    Tytuł:
    Liquefaction of saturated soil and the diffusion equation
    Autorzy:
    Sawicki, A.
    Sławińska, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/178612.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    liquefaction
    diffusion equation
    saturated soils
    sea bed
    Opis:
    The paper deals with the diffusion equation for pore water pressures with the source term, which is widely promoted in the marine engineering literature. It is shown that such an equation cannot be derived in a consistent way from the mass balance and the Darcy law. The shortcomings of the artificial source term are pointed out, including inconsistencies with experimental data. It is concluded that liquefaction and the preceding process of pore pressure generation and the weakening of the soil skeleton should be described by constitutive equations within the well-known framework of applied mechanics. Relevant references are provided.
    Źródło:
    Studia Geotechnica et Mechanica; 2015, 37, 2; 39-44
    0137-6365
    2083-831X
    Pojawia się w:
    Studia Geotechnica et Mechanica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Study on Modelling the Plane Strain Behaviour of Sand and its Stability
    Autorzy:
    Sawicki, A.
    Sławińska, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/241244.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
    Tematy:
    sand deformations
    liquefaction
    instability
    plane strain
    Opis:
    The plane strain behaviour of sand is studied using, previously proposed, incremental model describing its pre-failure deformations. Original model has been formulated for the tri-axial configuration, and then generalized for 3D conditions. This 3D model was subsequently adapted to study deformations of sand in the plane strain conditions, in the x1, x3 plane. There are three unknowns in such a configuration, namely the principal strains ε1 , ε3 and the principal stress σ2. Respective equations were derived, and then applied to study deformations of sand for chosen stress paths. The governing incremental equations were integrated numerically, and it was shown, for some loading paths, that σ2 depends linearly on the other principal stresses, so introduction of apparent Poisson's ratio is justified, as a kind of approximation. Subsequent analysis of deformations of sand was performed using this concept, as well as using full system of governing equations.
    Źródło:
    Archives of Hydro-Engineering and Environmental Mechanics; 2012, 59, 3-4; 85-100
    1231-3726
    Pojawia się w:
    Archives of Hydro-Engineering and Environmental Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Deformations and liquefaction of granular soils in plane strain conditions
    Autorzy:
    Sawicki, A.
    Sławińska, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/241416.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
    Tematy:
    granular soils
    deformations
    liquefaction
    stability
    plane strain conditions
    Opis:
    An incremental model is proposed to describe pre-failure behaviour of granular soils in plane strain conditions. The model has been derived from an approach applied in the analysis of triaxial tests. We have applied the methods of tensor algebra to transfer our triaxial results to a 2D case. The model describes the pre-failure deformations of fully drained sands and phenomena associated with undrained response such as static liquefaction. This model has a simple structure in the form of incremental equations. For some simple loading paths, these equations can be integrated analytically. For more complex loading paths a simple numerical algorithms will be sufficient. The model takes into account an initial anisotropy of soil which is ignored in most models. It also takes into account the initial state of soil, defined as rather contractive or dilative, in addition to classical geotechnical division into loose and dense sands. The proposed constitutive equations allow the study of pre-failure instabilities of sand, and some examples are presented. We have also derived analytically the equation for an instability line.
    Źródło:
    Archives of Hydro-Engineering and Environmental Mechanics; 2012, 59, 1-2; 13-35
    1231-3726
    Pojawia się w:
    Archives of Hydro-Engineering and Environmental Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structure and calibration of constitutive equations for granular soils
    Autorzy:
    Sawicki, A.
    Sławińska, J.
    Mierczyński, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/178614.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    granular soil
    constitutive equations
    triaxial conditions
    pre-failure deformations
    Opis:
    The form of incremental constitutive equations for granular soils is discussed for the triaxial configuration. The classical elasto-plastic approach and the semi-empirical model are discussed on the basis of constitutive relations determined directly from experimental data. First, the general structure of elasto-plastic constitutive equations is presented. Then, the structure of semiempirical constitutive equations is described, and a method of calibrating the model is presented. This calibration method is based on a single experiment, performed in the triaxial apparatus, which also involves a partial verification of the model, on an atypical stress path. The model is shown to give reasonable predictions. An important feature of the semi-empirical incremental model is the definition of loading and unloading, which is different from that assumed in elasto-plasticity. This definition distinguishes between spherical and deviatoric loading/unloading. The definition of deviatoric loading/unloading has been subject to some criticism. It was therefore discussed and clarified in this paper on the basis of the experiment presented.
    Źródło:
    Studia Geotechnica et Mechanica; 2014, 36, 4; 35-46
    0137-6365
    2083-831X
    Pojawia się w:
    Studia Geotechnica et Mechanica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Compaction/Liquefaction Properties of Some Model Sands
    Autorzy:
    Sawicki, A.
    Mierczyński, J.
    Sławińska, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/241301.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
    Tematy:
    soil compaction
    liquefaction
    parameters
    experimental data
    Opis:
    The compaction/liquefaction characteristics of two model sands are determined experimentally. One sand (Istanbul) is used in shaking table investigations, and the other (Dundee) in geotechnical centrifuge experiments. Both types of these highly sophisticated experiments are planned to be applied to test theories of seabed liquefaction. The first step of these experiments is to determine the parameters of model soils, which is the main goal of this paper.
    Źródło:
    Archives of Hydro-Engineering and Environmental Mechanics; 2015, 62, 3-4; 121-133
    1231-3726
    Pojawia się w:
    Archives of Hydro-Engineering and Environmental Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Liquefaction Resistance of a Granular Soil Containing Some Admixtures of Fines
    Autorzy:
    Sawicki, A.
    Mierczyński, J.
    Mikos, A.
    Sławińska, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/241276.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
    Tematy:
    liquefaction
    admixtures of silt
    triaxial investigations
    Opis:
    The paper deals with the mechanics of sand with some admixtures of fines. The basic question is whether such admixtures are liquefiable or not. Experimental results show that admixtures of fines do not essentially influence the liquefaction susceptibility of granular soils. The original experimental investigations support this conclusion.
    Źródło:
    Archives of Hydro-Engineering and Environmental Mechanics; 2015, 62, 1-2; 53-64
    1231-3726
    Pojawia się w:
    Archives of Hydro-Engineering and Environmental Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mechanical Properties of Granular Soils: Triaxial versus Plane Strain Investigations
    Autorzy:
    Sawicki, A.
    Sławińska, J.
    Mierczyński, J.
    Smyczyński, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/241496.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
    Tematy:
    mechanical properties of granular soils
    triaxial investigations
    true triaxial apparatus
    liquefaction
    Opis:
    The paper compares the pre-failure behavior of granular soils investigated in the classical triaxial apparatus and in the true triaxial apparatus, under plane strain conditions. Both experiments are described within the framework of an incremental model of the pre-failure behavior of sands. The methods of tensor algebra are used to compare theoretical predictions with experimental results. The analysis presented deals with the pre-failure deformations of fully drained sand, aswell as with its undrained behavior, including static liquefaction and the specific behavior of an initially dilative soil. Some key questions of soil mechanics are discussed, for instance, whether soil parameters determined from one configuration, such as triaxial conditions, can be applied in other cases.
    Źródło:
    Archives of Hydro-Engineering and Environmental Mechanics; 2016, 63, 2-3; 135-156
    1231-3726
    Pojawia się w:
    Archives of Hydro-Engineering and Environmental Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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