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    Tytuł:
    Stress-dilatancy relationship for railway balast
    Autorzy:
    Dołżyk-Szypcio, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/178215.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    railway ballast
    critical state
    frictional state
    dilatancy
    Opis:
    Knowledge of the mechanical behaviour of ballast is very important for designing a railway track, especially for high-speed lines. The monotonic drained triaxial tests of scaled and fouled ballast presented in literature were analysed using the Frictional State Theory. The stress-plastic dilatancy relationship shows that four characteristic stages of shearing may be specified. The influence of stress level and water content may be quantified by the use of the Frictional State Theory.
    Źródło:
    Studia Geotechnica et Mechanica; 2018, 40, 2; 79-85
    0137-6365
    2083-831X
    Pojawia się w:
    Studia Geotechnica et Mechanica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Improvement of the effectiveness of the greywacke crushing process by applying an impact crusher in a quarry for the production of railway ballast
    Autorzy:
    Kurus, Krzysztof
    Jąderko-Skubis, Karolina
    Powiązania:
    https://bibliotekanauki.pl/articles/1839026.pdf
    Data publikacji:
    2020
    Wydawca:
    Główny Instytut Górnictwa
    Tematy:
    greywacke
    crusher
    railway ballast
    aggregates
    quarry
    szarogłaz
    kruszarka
    podsypka kolejowa
    kruszywa
    kamieniołom
    Opis:
    The production of aggregates in rock mining requires an optimal system of crushers, separators and conveyors. Proper machine selection allows aggregates with appropriate technical parameters to be obtained and increases the output of the required fractions with a given unit cost. The usage of rock raw materials for the production of railway ballasts used in a railway track superstructure is connected with the necessity of meeting strictly defined quality requirements. This paper presents an example of the use of an impact crusher in a selected quarry for the purpose of obtaining the correct parameters of railway ballast and a suitable grain curve. The evaluation was carried out based on the results of technological tests which were compared with the technologies used to date, thus ensuring the effectiveness of the solution in the practice of quarries.
    Źródło:
    Journal of Sustainable Mining; 2020, 19, 3; 195-200
    2300-1364
    2300-3960
    Pojawia się w:
    Journal of Sustainable Mining
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental and theoretical evaluation of side tamping method for ballasted railway track maintenance
    Autorzy:
    Przybylowicz, Michal
    Sysyn, Mykola
    Kovalchuk, Vitalii
    Nabochenko, Olga
    Parneta, Bogdan
    Powiązania:
    https://bibliotekanauki.pl/articles/1841194.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
    Tematy:
    railway ballast
    ballast tamping
    photogrammetric measurements
    FEM simulation
    podsypka kolejowa
    podbijanie tłucznia
    pomiary fotogrametryczne
    symulacja FEM
    Opis:
    Ballast layer is the most weak element of railway track that causes track geometry deterioration. At the same time, it is subjected to intensive particle breakage during the corrective tamping. This causes high maintenance costs of ballasted track. The present paper is devoted to the study of tamping methods. The present machine tamping methods are considered and compared. The possible influence of the tamping technology on the ballast-related maintenance costs is analyzed. The side tamping technology is studied in detail with theoretical and experimental methods. The process of material transport during the side tamping is studied using a scale model of ballast layer and photogrammetric measurements. A theoretical finite element model (FEM) is validated to the experimental results. The study shows that the side tamping is a promising method for the development of a universal, superstructure independent tamping technology.
    Źródło:
    Transport Problems; 2020, 15, 3; 93-106
    1896-0596
    2300-861X
    Pojawia się w:
    Transport Problems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A new high-efficiency procedure for aggregate gradation determination of the railway ballast by means image recognition method
    Autorzy:
    Guerrieri, M.
    Parla, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/231252.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    balast kolejowy
    kruszywo
    analiza obrazu
    segmentacja
    uziarnienie kruszywa
    railway ballast
    aggregate
    image analysis
    segmentation
    aggregate gradation
    Opis:
    The mechanical characteristics of the railway superstructure are related to the properties of the ballast, and especially to the particle size distribution of its grains. Under the constant stress-strain of carriages, the ballast can deteriorate over time, and consequently it should properly be monitored for safety reasons. The equipment which currently monitors the railway superstructure (like the Italian diagnostic train Archimede) do not make any “quantitative” evaluation of the ballast. The aim of this paper is therefore to propose a new methodology for extracting railway ballast particle size distribution by means of the image processing technique. The procedure has been tested on a regularly operating Italian railway line and the results have been compared with those obtained from laboratory experiments, thus assessing how effective is the methodology which could potentially be implemented also in diagnostic trains in the near future.
    Źródło:
    Archives of Civil Engineering; 2013, 59, 4; 469-482
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A laboratory study of pressure distribution and residual settlements in wide grading double layer railway ballast under long-term cyclic loading
    Autorzy:
    Sysyn, M.
    Gerber, U.
    Nabochenko, O.
    Dehne, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1849767.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    podsypka kolejowa
    podsypka dwuwarstwowa
    zachowanie
    obciążenie długotrwałe
    obciążenie cykliczne
    osiadanie
    ciśnienie
    rozkład ciśnienia
    railway ballast
    long-term behaviour
    permanent settlement
    ballast grading
    pressure
    pressure distribution
    Opis:
    Ballast layer has weighty share in the lifecycle costs of railway track. The strict standards and maintenance rules of ballast grading significantly contribute to the ballast costs. One ways to the costs reduction is differential demands to ballast grading for the secondary and low loaded railway lines. Additional one is the different ballast grading over the ballast height. This study presents a full scale laboratory investigation of technical efficiency of such railway ballast under the long-term cyclic loading in comparison with the standard ballast layer. The double layer is presented with standard grading ballast upper layer and bottom sub ballast layer consists of ballast mixture. Pressure distribution under the ballast layer and permanent settlements of the layers are measured during the loading cycles. The reference measurements with standard grading ballast material are carried out. The study shows that initial settlement accumulation of the double layer railway ballast are lower to that of the standard ballast layer. However, the settlements accumulation intensity of the ballast is higher. The analysis of the pressure distribution measurements under the ballast layer and the settlements inside the ballast layer explain the causes of the different settlement accumulation.
    Źródło:
    Archives of Civil Engineering; 2020, 66, 4; 561-578
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Algorithm for the extraction of selected rail track ballast degradation using machine vision
    Autorzy:
    Lesiak, Piotr
    Bojarczak, Piotr
    Sokołowski, Aleksander
    Powiązania:
    https://bibliotekanauki.pl/articles/27314062.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
    Tematy:
    railway track
    ballast degradation
    image extraction algorithm
    surface descriptors
    tor kolejowy
    Opis:
    A number of physical methods are used to survey railway track ballast to assess its degradation as a function of deposition. Simulation tests on track models are also conducted. These testing methods, which are generally labour-intensive and expensive, provide an accurate understanding of the extent of ballast degradation. However, the impact of inadequate maintenance can be observed, even on the surface. Therefore, it seems natural in this case to use image registration. State-of-the-art machine vision systems of track geometry cars provide the means to do this. Obtained ballast images provide a baseline for evaluating its level in relation to sleepers. However, no information is available on other signs of track degradation, such as overgrown vegetation (weeds) or the so-called local muddy areas, which are generally a consequence of poor drainage and a lack of subgrade insulation. These degradations are observed to generate distinctive colour images that are superimposed on the overall image of the ballast surface. They differ in colour and shape. Hence, the authors used this phenomenon to develop an algorithm for the extraction of ballast degradation images based on RGB imaging. Surface descriptors have also been offered to assess these degradations. Extensive measurement material from the railway lines was used to conduct survey experiments based on the examples. The results clearly demonstrate the high success rate of the applied method.
    Źródło:
    Transport Problems; 2023, 18, 1; 129--141
    1896-0596
    2300-861X
    Pojawia się w:
    Transport Problems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A soil-steel bridge under high-speed railways
    Autorzy:
    Andersson, A.
    Karoumi, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/383518.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    high-speed railway
    dynamic soil-structure interaction
    ballast acceleration
    soil-steel composite bridges
    Opis:
    This paper presents some recent research on railway bridge dynamics with application to buried flexible structures. Based on a combination of simulations and full-scale testing, current research indicates that a rather comprehensive numerical model is required to accurately describe the response from passing trains.
    Źródło:
    Archiwum Instytutu Inżynierii Lądowej; 2017, 23; 45-52
    1897-4007
    Pojawia się w:
    Archiwum Instytutu Inżynierii Lądowej
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Upgrading of vibrating compactor of the railway track ballast of VPO-3000 machine
    Autorzy:
    Lee, S.
    Akhmetov, M.
    Ibraimov, A.
    Taran, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/374465.pdf
    Data publikacji:
    2012
    Wydawca:
    Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
    Tematy:
    balast
    podkłady kolejowe
    zagęszczenie
    urządzenie uruchamiające
    ballast
    railway track
    plate vibrator
    compaction
    actuating device
    Opis:
    In the course of work a new vibrating compactor with single-direction inertial forces according to the authors’ innovative license is applied. Examination of possible dependence on substantiation of the new vibrating device parameters is shown. The new single-direction vibrating device for road crushed rock compaction allows decreasing vibration to the machine frame and increasing its working capacity. The new vibrating device’s efficiency to 11,7% increases the existing ones.
    Źródło:
    Transport Problems; 2012, 7, 4; 95-104
    1896-0596
    2300-861X
    Pojawia się w:
    Transport Problems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Multiple-factor analysis of the dynamic interaction between railroad cars and joint irregularity
    Autorzy:
    Shpachuk, V.
    Chuprynin, A.
    Suprun, T.
    Kovalenko, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/196360.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
    Tematy:
    railway rolling stock
    track
    ballast
    four-axle car
    joint irregularity
    trailing rail
    facing rail
    tabor kolejowy
    tor
    balast
    samochód czteroosiowy
    Opis:
    Mechanical models of “railroad car-track” transport system for each phase of motion are developed. Particularities of dynamic interaction between the four-axle car and the track are studied by considering four phases of motion over joint irregularity. Methods for solving differential equations of the discrete-continuous system fluctuation are developed. Numerical analysis is used to determine deflections of the trailing rail under the first sleeper for each phase of motion depending on motion phases, and car load and speed.
    Źródło:
    Zeszyty Naukowe. Transport / Politechnika Śląska; 2018, 99; 183-192
    0209-3324
    2450-1549
    Pojawia się w:
    Zeszyty Naukowe. Transport / Politechnika Śląska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mechanical interaction of the rail transport car and joint irregularity
    Autorzy:
    Shpachuk, Vladimir
    Chuprynin, Aleksandr
    Suprun, Tatiana
    Kovalenko, Andriy
    Powiązania:
    https://bibliotekanauki.pl/articles/2091238.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
    Tematy:
    railway rolling stock
    four-axle car
    track
    ballast
    joint irregularity
    trailing rail
    facing rail
    tabor kolejowy
    wagon czteroosiowy
    tor
    podsypka
    nierówność spoiny
    szyna czołowa
    Opis:
    Mechanical models of a transport system “carriage - track” while crossing a joint irregularity are proposed. An investigation was conducted on the peculiarities of static, shock and dynamic interaction between the four-axle car and the track, considering tram wheelsets motion features over joint irregularity. A method to solve the equations of a mathematical model of static, shock and dynamic interaction is developed. Numerical analysis is used to determine deflections of the facing rail under the first sleeper for each phase of motion depending on motion phases, and car load and speed.
    Źródło:
    Zeszyty Naukowe. Transport / Politechnika Śląska; 2021, 113; 173--189
    0209-3324
    2450-1549
    Pojawia się w:
    Zeszyty Naukowe. Transport / Politechnika Śląska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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