Název: The effect of the backfill on the integrity of a buried pipeline upon heavy-duty vehicle crossings
Autoři: Gajdoš, Lubomír ; Šperl, Martin ; Slížková, Zuzana ; Drdlová, M.
Typ dokumentu: Příspěvky z konference
Konference/Akce: ICBMPT 2023. International conference. Building materials, products and technologies /26./, Telč (CZ), 20230523
Rok: 2023
Jazyk: eng
Abstrakt: The aim of this work was to determine stresses in the wall of a buried empty gas pipeline caused by the weight of backfill as well as by heavy-duty vehicles crossing the pipeline, and, on their basis to assess the applicability of protective sleeves. A buried pipeline with zero internal pressure of transported medium (empty pipeline) differs from an unburied pipeline by the vertical load due to the weight of the backfill which causes an ovalness of the circular cross section of the pipeline. This leads to the rise of through-wall bending stresses with the tensile stress at the outside surface at the 3 and 9 o´clock positions and compressive stress at the inside surface. At the 6 and 12 o´clock positions the stresses are tensile at the inside surface and compressive at the outside surface. The current depth of soil cover above gas pipelines is 0.5 m. For pipes DN500, t ~ 6.5 mm the through-wall bending stress is found to be σb ≈ ±10 MPa. In comparison with the yield stress of pipeline material, this stress is negligible. The situation is changed when heavy-duty vehicles cross the pipeline. For example, when a MAN truck with the mass load 3270 kg acting on a single wheel of the front axle crosses this pipeline, the pressure transmitted to the pipe will cause the through-wall bending stress σb ≈ ±76 MPa. This stress is superimposed to that of the backfill to give the total value ±86 MPa. When dead loads, imposed by backfill cover, together with live loads, caused by truck-wheel loads, are excessive a crushing of side walls of the pipeline and/or ring buckling of the pipe cross section can happen.
Klíčová slova: buried pipeline; gas pipeline; pressure
Číslo projektu: FW01010021
Poskytovatel projektu: GA TA ČR
Zdrojový dokument: Journal of Physics: Conference Series, ISSN 1742-6588
Poznámka: Související webová stránka: https://doi.org/10.1088/1742-6596/2568/1/012002

Instituce: Ústav teoretické a aplikované mechaniky AV ČR (web)
Informace o dostupnosti dokumentu: Dokument je dostupný v příslušném ústavu Akademie věd ČR.
Původní záznam: https://hdl.handle.net/11104/0343022

Trvalý odkaz NUŠL: http://www.nusl.cz/ntk/nusl-533131


Záznam je zařazen do těchto sbírek:
Věda a výzkum > AV ČR > Ústav teoretické a aplikované mechaniky
Konferenční materiály > Příspěvky z konference