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    Wyświetlanie 1-11 z 11
    Tytuł:
    Influence of installation effects on pile bearing capacity in cohesive soils – large deformation analysis via Finite Element Method
    Autorzy:
    Konkol, J.
    Bałachowski, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/178233.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    Coupled Lagrangian Eulerian
    installation effects
    static load test
    Updated Lagrangian
    Opis:
    In this paper, the whole process of pile construction and performance during loading is modelled via large deformation finite element methods such as Coupled Eulerian Lagrangian (CEL) and Updated Lagrangian (UL). Numerical study consists of installation process, consolidation phase and following pile static load test (SLT). The Poznań site is chosen as the reference location for the numerical analysis, where series of pile SLTs have been performed in highly overconsolidated clay (OCR ≈ 12). The results of numerical analysis are compared with corresponding field tests and with so-called “wish-in-place” numerical model of pile, where no installation effects are taken into account. The advantages of using large deformation numerical analysis are presented and its application to the pile designing is shown.
    Źródło:
    Studia Geotechnica et Mechanica; 2017, 39, 1; 27-38
    0137-6365
    2083-831X
    Pojawia się w:
    Studia Geotechnica et Mechanica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Physical modelling of geotechnical structures in ports and offshore
    Autorzy:
    Bałachowski, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/259902.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    centrifuge
    calibration chamber
    CPT
    Opis:
    The physical modelling of subsoil behaviour and soil-structure interaction is essential for the proper design of offshore structures and port infrastructure. A brief introduction to such modelling of geoengineering problems is presented and some methods and experimental devices are described. The relationships between modelling scales are given. Some examples of penetration testing results in centrifuge and calibration chamber are presented. Prospects for physical modelling in geotechnics are also described.
    Źródło:
    Polish Maritime Research; 2017, S 1; 4-9
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Large deformation finite element analysis of undrained pile installation
    Autorzy:
    Konkol, J.
    Bałachowski, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/178900.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    Arbitrary Lagrangian–Eulerian
    ALE
    FEM
    pile jacking
    Pile installation
    Undrained analysis
    Opis:
    In this paper, a numerical undrained analysis of pile jacking into the subsoil using Abaqus software suit has been presented. Two different approaches, including traditional Finite Element Method (FEM) and Arbitrary Lagrangian–Eulerian (ALE) formulation, were tested. In the first method, the soil was modelled as a two-phase medium and effective stress analysis was performed. In the second one (ALE), a single-phase medium was assumed and total stress analysis was carried out. The fitting between effective stress parameters and total stress parameters has been presented and both solutions have been compared. The results, discussion and verification of numerical analyzes have been introduced. Possible applications and limitations of large deformation modelling techniques have been explained.
    Źródło:
    Studia Geotechnica et Mechanica; 2016, 38, 1; 45-54
    0137-6365
    2083-831X
    Pojawia się w:
    Studia Geotechnica et Mechanica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Parametry mechaniczne platformy roboczej na podstawie badań DMT
    Mechanical parameters of working platform based on DMT
    Autorzy:
    Bialek, K.
    Balachowski, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/40917.pdf
    Data publikacji:
    2016
    Wydawca:
    Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
    Tematy:
    podloza uwarstwione
    parametry geotechniczne
    platforma robocza
    parametry mechaniczne
    wytrzymalosc na scinanie
    kat tarcia wewnetrznego
    badanie DMT
    layered subsoil
    geotechnical parameter
    working platform
    mechanical parameter
    shear strength
    internal friction angle
    DMT test
    Opis:
    Nośność platformy roboczej określana jest w sposób analogiczny do nośności podłoża uwarstwionego, w którym warstwa wierzchnia zbudowana z gruntu niespoistego spoczywa na słabonośnym podłożu z gruntu spoistego. Badanie DMT wykorzystano do wyznaczenia parametrów wytrzymałościowych podłoża (kąta tarcia wewnętrznego warstwy górnej i wytrzymałości na ścinanie bez odpływu podłoża słabonośnego) oraz do wyznaczenia modułu odkształcenia gruntu (MDMT). Wyznaczono wartości charakterystyczne poszczególnych parametrów na podstawie wyników z pięciu badań dylatometrycznych na poletku doświadczalnym. Przeanalizowano różne metody oszacowania wartości charakterystycznej parametrów geotechnicznych.
    Bearing capacity of working platform is determined in a simmilar way as for layered subsoil, where the upper layer from cohesionless soil is resting on soft cohesive strata. DMT test was used to estimate soil strength parameters (angle of internal friction for the upper layer and undrained shear strength of soft subsoil) and constrained modulus MDMT. The characteristic soil parameters were determined with five dilatometer tests on trial field. Different estimation methods of characteristic value of soil parameters were considered.
    Źródło:
    Acta Scientiarum Polonorum. Architectura; 2016, 15, 3
    1644-0633
    Pojawia się w:
    Acta Scientiarum Polonorum. Architectura
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Bearing capacity of the working platform with kinematic method
    Autorzy:
    Białek, K.
    Bałachowski, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/178343.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    soft soil
    undrained shear strength
    limit state
    failure mechanism
    Opis:
    Bearing capacity of the working platform for heavy tracks was analysed using Distinct Layout Optimization (DLO) method. The platform layer constructed from cohesionless soils is resting on weak cohesive subgrade. Different thickness of the platform, its effective angle of internal friction and undrained shear strength of the soft soil were taken into consideration. Kinematic method permits different failure mechanisms to be analyzed. Margin of safety for a given load and subsoil conditions was determined using two approaches: increasing the load or decreasing the shear strength up to failure. The results were compared with solution proposed in BRE recommendations.
    Źródło:
    Studia Geotechnica et Mechanica; 2015, 37, 1; 3-8
    0137-6365
    2083-831X
    Pojawia się w:
    Studia Geotechnica et Mechanica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Deep compaction control of sandy soils
    Autorzy:
    Bałachowski, L.
    Kurek, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/178341.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    vibrocompaction
    CPTU
    sands
    soil behaviour type
    piaski
    gleby piaszczyste
    zagęszczanie wibracyjne
    Opis:
    Vibroflotation, vibratory compaction, micro-blasting or heavy tamping are typical improvement methods for the cohesionless deposits of high thickness. The complex mechanism of deep soil compaction is related to void ratio decrease with grain rear-rangements, lateral stress increase, prestressing effect of certain number of load cycles, water pressure dissipation, aging and other effects. Calibration chamber based interpretation of CPTU/DMT can be used to take into account vertical and horizontal stress and void ratio effects. Some examples of interpretation of soundings in pre-treated and compacted sands are given. Some acceptance criteria for compaction control are discussed. The improvement factors are analysed including the normalised approach based on the soil behaviour type index.
    Źródło:
    Studia Geotechnica et Mechanica; 2014, 36, 2; 3-8
    0137-6365
    2083-831X
    Pojawia się w:
    Studia Geotechnica et Mechanica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mechanical properties of bottom ash dredged material mixtures in laboratory tests
    Autorzy:
    Bałachowski, L.
    Sikora, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/178968.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    bottom ash
    mechanical properties
    laboratory tests
    dike
    popioły
    właściwości mechaniczne
    badania laboratoryjne
    grobla
    Opis:
    Bottom ash from EC Gdańsk and dredged material taken from the mouth of The Vistula were mixed to form an engineering material used for dike construction. Mixtures with different bottom ash content were tested in laboratory to determine its basic physical and mechanical properties. The optimum bottom ash–dredged material mixture, built in the corps of the test dike, contains 70% of ash. The optimum bottom ash content in the mixture was chosen taking into account high internal friction angle, good compaction and reduced filtration coefficient. The maximum dry density of the mixtures was measured in Proctor test for the mixtures formed in laboratory and on samples taken from the test dike. Minimum and maximum void ratio were also determined.
    Źródło:
    Studia Geotechnica et Mechanica; 2013, 35, 3; 3-11
    0137-6365
    2083-831X
    Pojawia się w:
    Studia Geotechnica et Mechanica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Characteristics of tyre chips-sand mixtures from triaxial tests
    Autorzy:
    Bałachowski, L.
    Gotteland, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/241136.pdf
    Data publikacji:
    2007
    Wydawca:
    Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
    Tematy:
    triaxial tests
    waste tyres
    recycling
    backfill
    Opis:
    Civil engineering and mainly geotechnics and pavement engineering are the possible domains of application for the end of life tyres. They are used in geotechnical applications as backfill or lightweight fill material in substitution or in combination with natural soils. The mechanical behaviour of tyre chip-sand mixtures was studied in a series of CD triaxial tests. The study was focused on random distribution of tyre chips within the mixture. Initial modulus of deformation, angle of internal friction and cohesion were evaluated for each series of test. A composite conserves a good shear resistance at large strains. The mode of failure depends on the tyre content. The internal shear mechanism and the reinforcement mechanism of the composite are discussed as a function of tyre content, chips orientation and stress level.
    Źródło:
    Archives of Hydro-Engineering and Environmental Mechanics; 2007, 54, 1; 25-36
    1231-3726
    Pojawia się w:
    Archives of Hydro-Engineering and Environmental Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Size Effect in Centrifuge Cone Penetration Tests
    Autorzy:
    Bałachowski, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/241236.pdf
    Data publikacji:
    2007
    Wydawca:
    Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
    Tematy:
    centrifuge
    CPT
    quartz sands
    grain size
    Opis:
    In-flight penetration tests with 12 mm mini-cone, were performed in the centrifuge of L.C.P.C. in Nantes, in two uniform quartz sands of different grain size. Stress level effect and particle size effect on the cone resistance were analyzed. Geometry and particle size effects were found for cone penetration in coarse sand especially at a penetration less than the critical depth. The irregularities on the profile of mini-cone penetration in coarse sand can be attributed to particle size effect. The evidence of geometry size effect was not very marked for the relatively narrow range of acceleration applied.
    Źródło:
    Archives of Hydro-Engineering and Environmental Mechanics; 2007, 54, 3; 161-181
    1231-3726
    Pojawia się w:
    Archives of Hydro-Engineering and Environmental Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Penetration resistance of Lubiatowo sand in calibration chamber tests
    Autorzy:
    Bałachowski, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/241154.pdf
    Data publikacji:
    2006
    Wydawca:
    Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
    Tematy:
    calibration chamber
    CPT
    DMT
    model piles
    sands
    Opis:
    A series of cone penetration tests with standard cone and mini-cone were performed in the calibration chamber at Gdańsk University of Technology. Medium size, double wall chamber permits full control of stress and strain acting on the soil mass. The calibration chamber houses cylindrical soil sample 53 cm in diameter and 100 cm high. Lateral and vertical stresses, as well as strain conditions can be applied independently. The results of pushed-in model piles of small diameter, dilatometer tests, standard cone and mini CPT probe were analysed to determine size and boundary effects in penetration testing for calibration chamber and model sand. Free field values of cone resistance, independent of size and boundary effects, are proposed for Lubiatowo sand.
    Źródło:
    Archives of Hydro-Engineering and Environmental Mechanics; 2006, 53, 4; 311-329
    1231-3726
    Pojawia się w:
    Archives of Hydro-Engineering and Environmental Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Soft Soil Overconsolidation and CPTU Dissipation Test
    Autorzy:
    Bałachowski, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/241488.pdf
    Data publikacji:
    2006
    Wydawca:
    Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
    Tematy:
    CPTU
    DMT
    pore pressure
    stress history
    soft soil
    Opis:
    Stress state and stress history of subsoil under the flood embankment was evaluated with CPTU and DMT tests. The CPTU dissipation tests in soft soils under the central part of the embankment and on the upstream and downstream sides were performed. The shape of pore water dissipation curve reflects stress state and stress history. Monotonic decay of water pore pressure was found for normally consolidated soils. Dilatory pore pressure response is typical for overconsolidated soils. Methods for the flow characteristics determination (coefficient of consolidation and hydraulic conductivity) were presented.
    Źródło:
    Archives of Hydro-Engineering and Environmental Mechanics; 2006, 53, 2; 155-180
    1231-3726
    Pojawia się w:
    Archives of Hydro-Engineering and Environmental Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-11 z 11

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