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    Wyświetlanie 1-14 z 14
    Tytuł:
    Some effects of intrinsic cyclic loading in saturated sands
    Autorzy:
    Sawicki, A.
    Mierczyński, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/279931.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    saturated sand
    cyclic loading
    pore pressure
    triaxial tests
    deformations
    Opis:
    This paper presents original results of triaxial experiments performed at a cyclically changed pore pressure (intrinsic cyclic loading). The results display unusual behaviour of saturated sand subjected to such atypical loading. Some features of this behaviour are shown, including the following effects: static liquefaction of initially contractive sand, apparent creep of initially dilative sand, initial anisotropy, etc. Some differences between the classical geotechnical understanding of the effects of external cyclic loadings (such as earthquakes) and those caused by intrinsic cyclic loadings (such as wave-induced pressures) are discussed.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2015, 53, 2; 285-293
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wave-induced stresses and liquefaction in seabed according to the biot-type approach
    Autorzy:
    Sawicki, A.
    Mierczyński, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/241059.pdf
    Data publikacji:
    2005
    Wydawca:
    Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
    Tematy:
    seabed mechanics
    water wave
    liquefaction
    Opis:
    The problem of wave-induced stresses and liquefaction in the seabed according to the Biot-type approach is discussed. The first part of the paper deals with critical analysis of approaches presented in recent literature. It is shown that such approaches do not lead to proper description of the process of wave-induced pore-pressure generation and subsequent liquefaction of seabeds. The second part of this paper deals with the generalisation of the Biot-type approach to the case of shear modulus depending on mean effective stress.
    Źródło:
    Archives of Hydro-Engineering and Environmental Mechanics; 2005, 52, 2; 131-145
    1231-3726
    Pojawia się w:
    Archives of Hydro-Engineering and Environmental Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Instability line as a basic characteristic of non-cohesive soils
    Autorzy:
    Świdziński, W.
    Mierczyński, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/241208.pdf
    Data publikacji:
    2005
    Wydawca:
    Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
    Tematy:
    liquefaction
    cyclic mobility
    instability
    Opis:
    In the paper, the experimental results of undrained response of non-cohesive soil subjected to either monotonic or cyclic loading, are analysed and discussed. The analysis was based on the results of comprehensive testing programme made of "Skarpa" sand investigated in the triaxial compression. Two main undrained behaviours such as liquefaction and cyclic mobility were experimentally identified and studied. In the analysis of undrained behaviour, the concept of steady state of deformation has been adopted. It was shown that the undrained response of non-cohesive soils is governed by different failure mechanisms than in the case of drained samples. In undrained failure mechanism, an important role is played by an instability line, which may be identified with the initiation of potential liquefaction.
    Źródło:
    Archives of Hydro-Engineering and Environmental Mechanics; 2005, 52, 1; 39-58
    1231-3726
    Pojawia się w:
    Archives of Hydro-Engineering and Environmental Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pore-Pressure Generation and Liquefaction of Granular Soil Tested in Triaxial Conditions
    Autorzy:
    Mierczyński, J.
    Sawicki, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/241325.pdf
    Data publikacji:
    2009
    Wydawca:
    Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
    Tematy:
    cyclic loadings
    granular soils
    triaxial conditions
    pore-pressure generation
    liquefaction
    Opis:
    The paper deals with modelling of pore-pressure generation in saturated sand subjected to triaxial cyclic loading in undrained conditions. The model proposed links the pore-pressure generation with the cyclic loading induced compaction of the same sand, but tested in fully drained conditions. The governing equation for the pore-pressure changes is derived from the assumption that no volumetric strain develops in saturated sand in undrained conditions. The numerical solutions are compared with experimental data, for a large number of loading cycles.
    Źródło:
    Archives of Hydro-Engineering and Environmental Mechanics; 2009, 56, 3-4; 139-147
    1231-3726
    Pojawia się w:
    Archives of Hydro-Engineering and Environmental Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On the measurement of strains in the triaxial test
    Autorzy:
    Świdziński, W.
    Mierczyński, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/241518.pdf
    Data publikacji:
    2002
    Wydawca:
    Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
    Opis:
    In the paper, various methods of measuring a sample strains in a triaxial test are analysed. Accurate determination of the deformation of a specimen in a triaxial compression test is of great importance for correct evaluation of soil strain-stress characteristics, particularly in the pre-failure stress state in the range of small strains. In the paper, three different methods of measuring axial strains are analysed and discussed. Two consider the measurement of relative movement between top cap and base pedestal of the triaxial cell, the third being based on the direct measurement of local axial deformation of the sample tested. The measurement of radial strains is also discussed in respect of the corrections introduced for the specimen's bulging. To analyse various methods of strains measurements tests on diverse materials such as sand, steel and rubber were carried out, enabling the evaluation of the efficiency and accuracy of the measurement methods applied.
    Źródło:
    Archives of Hydro-Engineering and Environmental Mechanics; 2002, 49, 1; 23-41
    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:
    Theoretical analysis of model seabed behavior under water wave excitation
    Autorzy:
    Sawicki, A.
    Mierczyński, J.
    Smyczyński, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/178964.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    sea bed
    liquefaction
    wave-flume experiments
    saturated soils
    Opis:
    Theoretical analysis of the behavior of a model seabed subjected to water wave excitation is presented. The experiments were performed in the wave flume at the Danish Technological University in Lyngby. Such experiments are unique in engineering sciences and therefore provide unique empirical data for testing various models of the seabed. A controversial explanation of the experiments is presented in the literature. The goal of this research was to study pore pressure changes caused by water waves and the subsequent liquefaction of the seabed. The authors of the present contribution offer their own theoretical explanation of the wave flume experiments and discuss errors found in the literature cited. The analysis is based on the classical soil mechanics, including the Biot type approach.
    Źródło:
    Studia Geotechnica et Mechanica; 2015, 37, 2; 33-37
    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:
    Strains in Sand Due to Cyclic Loading in Triaxial Conditions
    Autorzy:
    Sawicki, A.
    Mierczyński, J.
    Świdziński, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/241087.pdf
    Data publikacji:
    2009
    Wydawca:
    Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
    Tematy:
    cyclic loadings
    granular soils
    permanent strains
    triaxial conditions
    Opis:
    The experimental results dealing with the cyclic loading of sand samples in triaxial conditions are presented. These results show the development of both the volumetric and deviatoric permanent strains due to a large number of loading cycles. The analysis of experimental data has led to the formulation of semi-empirical constitutive equations, expressed in the incremental form, for these strains as functions of the cyclic shear stress amplitude, number of loading cycles and the initial stress state, around which the cyclic shearing takes place.
    Źródło:
    Archives of Hydro-Engineering and Environmental Mechanics; 2009, 56, 1-2; 85-98
    1231-3726
    Pojawia się w:
    Archives of Hydro-Engineering and Environmental Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modelling of the Response of Partially Saturated Non-cohesive Soil Subjected to Undrained Loading
    Autorzy:
    Świdziński, W.
    Mierczyński, J.
    Smyczyński, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/241140.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
    Tematy:
    partial saturation
    undrained condition
    incremental equations
    Opis:
    The paper deals with the modelling of the undrained response of non-cohesive partially saturated soils subjected to triaxial compression. The model proposed is based on an incremental equation describing the pre-failure response of non-cohesive soils during shearing. The original model, developed by Sawicki, was modified by taking into account pore fluid compressibility. The governing equation makes it possible to simulate effective stress paths under undrained conditions. Numerical results are compared with experimental data.
    Źródło:
    Archives of Hydro-Engineering and Environmental Mechanics; 2018, 65, 1; 11-29
    1231-3726
    Pojawia się w:
    Archives of Hydro-Engineering and Environmental Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Response of Partially Saturated Non-cohesive Soils
    Autorzy:
    Świdziński, W.
    Mierczyński, J.
    Mikos, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/241293.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
    Tematy:
    partial saturation
    liquefaction
    pore pressure generation
    triaxial conditions
    Opis:
    This paper analyses and discusses experimental results of undrained triaxial tests. The tests were performed on non-cohesive partially saturated soil samples subjected to monotonic and cyclic loading. The tests were aimed at determining the influence of saturation degree on soil’s undrained response (shear strength, excess pore pressure generation). The saturation of samples was monitored by checking Skempton’s parameter B. Additionally, seismic P-wave velocity measurements were carried out on samples characterized by various degrees of saturation. The tests clearly showed that liquefaction may also take place in non-cohesive soils that are not fully saturated and that the liquefaction potential of such soils strongly depends on the B parameter.
    Źródło:
    Archives of Hydro-Engineering and Environmental Mechanics; 2017, 64, 3-4; 187-207
    1231-3726
    Pojawia się w:
    Archives of Hydro-Engineering and Environmental Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Basic set of experiments for determination of mechanical properties of sand
    Autorzy:
    Sawicki, A.
    Mierczyński, J.
    Świdziński, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/202447.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    granular soils
    mechanical properties
    experimental determination
    Opis:
    A basic set of experiments for the determination of mechanical properties of sands is described. This includes the determination of basic physical and mechanical properties, as conventionally applied in soil mechanics, as well as some additional experiments, which provide further information on mechanical properties of granular soils. These additional experiments allow for determination of steady state and instability lines, stress-strain relations for isotropic loading and pure shearing, and simple cyclic shearing tests. Unconventional oedometric experiments are also presented. Necessary laboratory equipment is described, which includes a triaxial apparatus equipped with local strain gauges, an oedometer capable of measuring lateral stresses and a simple cyclic shearing apparatus. The above experiments provide additional information on soil’s properties, which is useful in studying the following phenomena: pre-failure deformations of sand including cyclic loading compaction, pore-pressure generation and liquefaction, both static and caused by cyclic loadings, the effect of sand initial anisotropy and various instabilities. An important feature of the experiments described is that they make it possible to determine the initial state of sand, defined as either contractive or dilative. Experimental results for the “Gdynia” model sand are shown.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2014, 62, 1; 129-137
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    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 1-14 z 14

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