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Analysis of the possibilities of using composite structural c-channels as lining for an arch support in mining excavation

Rotkegel Marek, Korol Jerzy, Sobczak Dagmara

Archives of Mining Sciences

2021

Vol. 66, no. 3

437--455

The article is the result of a project aimed at developing and implementing a design of composite accessories for support in excavations located in underground hard coal mines. The research team verified the possibility of using elements made of prefabricated composite structural profile as an alternative to steel and reinforced concrete lining elements used to improve support’s stability and protect against rockfall. This paper includes a research experiment on the possibilities of using a composite C-profile element as lining made in the pultrusion technology with a longitudinal position of the roving. The prefabricated structural profiles were adapted to the function by designing seatings for fitting the flanges for arch support’s V-profiles. Prototypes of these elements were subjected to bench tests in compliance with the guidelines for testing mesh linings. In addition, computer simulations using the finite element method were carried out. The values obtained during the tests were compared with the requirements for lightweight mesh and included the Polish standard PN-G-15050 and reinforced A-type concrete lining defined in the standard PN-G-06021. The team determined the areas where material strength exceeded and the structure was damaged. Despite the limited quantity of laboratory tests and lack of field tests in actual mining conditions, it was possible to address the argument of the research and determine whether it is possible to use C-profile made in the pultrusion technology as a lining element.

Zastosowanie metody numerycznej do wyznaczenia ugięcia profilu aluminiowego o nieregularnym kształcie

Lonkwic P., Usydus I., Tofil A.

Obróbka Metalu

2018

nr 3

42--47

Jakość oraz cechy użytkowe produktu zależą bezpośrednio od warunków parametrów procesu wytwarzania. Wpływ na nią mają także działania w fazie poprzedzającej – projektowaniu. W artykule przedstawiono wyniki badań własnych ugięcia profili aluminiowych o regularnych kształtach wykonanych z aluminium typu AW-6060. Dokonano porównania wyników otrzymanych na drodze eksperymentu oraz na drodze analizy z wykorzystaniem metody elementów skończonych. Dobrano model numeryczny, który został wykorzystany do wyznaczenia ugięcia profilu o kształcie nieregularnym. Opracowany model numeryczny został zweryfikowany na stanowisku eksperymentalnym. Dla profilu o kształcie nieregularnym osiągnięto dopasowanie modelu numerycznego na poziomie 99,077%.

The quality and functional characteristics of the product depend directly on the conditions and parameters of the manufacturing process. It is also affected by activities in the previous phase – design. The paper presents the results of own research on deflection of aluminium profiles of regular shape made of aluminium type AW-6060, comparing the results obtained by experiment and by analysis with the use of the finite element method (FEM). A numerical model was selected which was used to determine the deflection of an irregularly shaped profile. The developed numerical model was verified on an experimental basis. For an irregular profile, a numerical model has been matched.