Informacja

Drogi użytkowniku, aplikacja do prawidłowego działania wymaga obsługi JavaScript. Proszę włącz obsługę JavaScript w Twojej przeglądarce.

English (EN)·Polski (PL)·Yкраїнський (UK)
Przejdź do strony domowej biblioteki Centralna Biblioteka Wojskowa Link otwiera się w nowym oknie Logo biblioteki Prolib Integro - strona głównaCentralna Biblioteka Wojskowa

Wyszukujesz frazę "podpora" wg kryterium: Temat

  Lista filtrów
Wyrównaj
    Wyświetlanie 1-4 z 4
    Tytuł:
    The analysis of selected methods of the yielding of a circular arch support made of V profiles
    Autorzy:
    Rotkegel, Marek
    Szot, Łukasz
    Fabich, Sławomir
    Powiązania:
    https://bibliotekanauki.pl/articles/1853839.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    wał
    podpora stalowa
    metoda elementów skończonych
    shaft
    circular support
    arch support
    Opis:
    Steel yielding arch support constructed of V profiles is commonly used to protect galleries and, in some cases, to reinforce or secure a shaft support. For this purpose, a closed, circular-shaped arch support is used, with arches overlapped by clamps that are typical for this type of construction. The support has high resistance to the impact of even (distributed over the entire surface of the support) load, however, as a result of significant deformation associated with a change in the radius of the curvatures, the support shows limited yielding capacity. This is due to the increase in resistance to slide on the locks, resulting from changes in the geometry of the ring caused by the rock mass. This article presents the results of research and analysis concerning the elements of the arch support with notches in arches. The research team tested the effect of the depth and location of the notches of the section’s flanges on the load impacting on the clamp’s bolts and the strength of the roof support. Moreover, the tests covered the influence of the number and location of clamps in a frictional joint on the change in the nature of work and yielding capacity. Finally, the research included both strength tests of the support’s elements, as well as strength analyses based on the finite element method.
    Źródło:
    Archives of Mining Sciences; 2020, 65, 3; 531-550
    0860-7001
    Pojawia się w:
    Archives of Mining Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of behaviour of the steel arch support in the geological and mining conditions of the Cam Pha coal basin, Vietnam
    Autorzy:
    Nguyen, Phu Minh Vuong
    Rotkegel, Marek
    Van, Hoang Do
    Powiązania:
    https://bibliotekanauki.pl/articles/1853833.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    podpora stalowa
    analiza numeryczna
    górnictwo wietnamskie
    steel arch support
    profiles of steel arch support
    numerical analysis
    Vietnamese coal mining industry
    Opis:
    In recent years, the Vietnamese coal mining industry has observed a dynamic increase in both its production and efficiency. In Vietnam, the most precious type of coal is anthracite, which is found in the Quang Ninh province. Industrial anthracite deposits are estimated to be over 2 billion Mg. At present, coal deposits are extracted mostly by the underground method. Coal production is gradually increasing in the underground mines in the Quang Ninh area and it is expected to constitute about 75% of the country’s total coal production in 2030. This involves an increase in the number and length of underground workings. Cam Pha is the largest coal basin of Vietnam, located in the Quang Ninh province. So far, the yearly length of underground workings driven in underground mines in the Cam Pha basin is roughly 90÷150 km. About 84 % of these underground workings are supported by the steel arch support made of SWP profile. A similar situation can be observed in Russia, Ukraine, China, India and Turkey. In addition, the average length of repaired underground workings in the Cam Pha basin constitutes approximately 30% of the total length driven . The main cause was reported is loss of underground workings stability. This requires significant material and labour costs as well as the cost of replacing damaged elements. Addi-tionally, it disturbs the continuity of the mining operations.This article presents the results of the numerical modelling of the rock mass around underground wor-kings driven in typical geo-mining conditions for underground coal mines in the Cam Pha basin, supported by the steel arch support made of SWP and V profiles. As a result of the conducted analyses, the range of failure zone of the rock mass around underground workings and the distribution of reduced stress in the steel arch support elements were determined. The effort states of the steel arch support made of SWP22 profile and V21 profile were compared. The simulations considered different inclinations angle of coal seam, following the structure of the rock mass in the Cam Pha basin. The analysis was carried out using the based-finite difference method code, FLAC2D. Based on the obtained results, actions for improving the stability of underground workings driven in the underground mines of the Cam Pha basin were proposed.
    Źródło:
    Archives of Mining Sciences; 2020, 65, 3; 551-567
    0860-7001
    Pojawia się w:
    Archives of Mining Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of spatial form of underground galleries on geometry and structural design of old mine support constructions
    Wpływ formy przestrzennej podziemnych wyrobisk na kształtowanie geometrii struktur konstrukcyjnych historycznych obudów górniczych
    Autorzy:
    Wieja, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/119011.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Towarzystwo Geometrii i Grafiki Inżynierskiej
    Tematy:
    brick lining
    geometry
    mine support
    steel support
    shape
    timber crib
    underground space
    timber post
    underground gallery
    obudowa murowa
    geometria
    obudowa górnicza
    podpora stalowa
    kształt
    kaszyca drewniana
    przestrzeń podziemna
    Opis:
    This study examines the geometry of old mine support structures, starting from simple props and chock supports to polygonal supports to refined truss or basket supports. The focus is on spatial structures of mine supports, geometry of their structural components’ crossprofiles and the locking (anchor) systems. The purpose of the present study is to define the geometric and spatial relations between the actual shape of structural elements and the manmade underground spatial structure.
    W artykule przedstawiono analizę geometrii historycznych ustrojów konstrukcyjnych obudów górniczych począwszy od prostych obudów typu stojakowego i kasztowego, poprzez obudowy poligonalne, aż do wyrafinowanych konstrukcji typu kratownicowego i koszykowego. Analiza obejmuje struktury przestrzenne obudów oraz geometrię przekrojów elementów konstrukcyjnych i systemu ich wiązań tzw. zamków. Istotą opracowania jest zdefiniowanie relacji geometrycznych oraz przestrzennych pomiędzy kształtem ustrojów konstrukcyjnych obudów a antropogeniczną podziemną strukturą przestrzenną.
    Źródło:
    Journal Biuletyn of Polish Society for Geometry and Engineering Graphics; 2017, 30; 63-72
    1644-9363
    Pojawia się w:
    Journal Biuletyn of Polish Society for Geometry and Engineering Graphics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental studies of static and dynamic steel arch support load capacity and sliding joint temperature parameters during yielding
    Autorzy:
    Pytlik, Andrzej
    Powiązania:
    https://bibliotekanauki.pl/articles/1853806.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    nośność statyczna
    wyrobisko
    podpora stalowa
    yielding steel arch support
    support shackle torque
    static and dynamic load capacity
    support work
    arch acceleration in sliding joints
    joint sparking and heating temperature during yielding
    Opis:
    Difficult geological and mining conditions as well as great stresses in the rock mass result in significant deformations of the rocks that surround the workings and also lead to the occurrence of tremors and rock bursts. Yielding steel arch support has been utilised in the face of hard coal extraction under difficult conditions for many years, both in Poland and abroad. A significant improvement in maintaining gallery working stability is achieved by increasing the yielding support load capacity and work through bolting; however, the use of rock bolts is often limited due to factors such as weak roof rock, significant rock mass fracturing, water accumulation, etc. This is why research and design efforts continue in order to increase yielding steel arch support resistance to both static and dynamic loads. Currently, the most commonly employed type of yielding steel arch support is a support system with frames constructed from overlapping steel arches coupled by shackles. The yield of the steel frame is accomplished by means of sliding joints constructed from sections of various profiles (e.g. V, TH or U-type), which slip after the friction force is exceeded; this force is primarily dependent on the type of shackles and the torque of the shackle screw nuts. This article presents the static bench testing results of ŁP10/V36/4/A, ŁP10/V32/4/A and ŁP10/V29/4/A yielding steel arch support systems formed from S480W and S560W steel with increased mechanical properties. The tests were conducted using 2 and 3 shackles in the joint, which made it possible to compare the load capacities, work values and characteristics of various types of support. The following shackle screw torques were used for the tests: Md = 500 Nm – for shackles utilised in the support constructed from V32 and V36 sections. Md = 400 Nm – for shackles utilised in the support constructed from V29 sections. The shackle screw torques used during the tests were greater compared to the currently utilised standard shackle screw torques within the range of Md = 350-450 Nm. Dynamic testing of the sliding joints constructed from V32 section with 2 and 3 shackles was also performed. The SD32/36W shackles utilised during the tests were produced in the reinforced versions and manufactured using S480W steel. Since comparative testing of a rock bolt-reinforced steel arch support system revealed that the bolts would undergo failure at the point of the support yield, a decision was made to investigate the character of the dynamics of this phenomenon. Consequently, this article also presents unique measurement results for top section acceleration values registered in the joints during the conduction of support tests at fullscale.Filming the yield in the joint using high-speed video and thermal cameras made it possible to register the dynamic characteristics of the joint heating process at the arch contact point as well as the mechanical sparks that accompanied it. Considering that these phenomena have thus far been poorly understood, recognising their significance is of great importance from the perspective of occupational safety under the conditions of an explosive atmosphere, especially in the light of the requirements of the new standard EN ISO 80079-36:2016, harmonised with the ATEX directive.
    Źródło:
    Archives of Mining Sciences; 2020, 65, 3; 469-491
    0860-7001
    Pojawia się w:
    Archives of Mining Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

      Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies