Tests of steel arch and rock bolt support resistance to static and dynamic loading induced by suspended monorail transportation

• Autorzy: Pytlik Andrzej

Identyfikatory

DOI

10.2478/sgem-2019-0009

• Języki publikacji: EN

Abstrakty

EN

At present, the suspended monorail systems constitute a very common means of transportation in the Polish hard coal mines. The main advantages of the suspended monorail include the independence of the route from the working floor surface irregularities and the possibility to transport cargo of significant mass and size. The masses and dimensions of machines and devices transported via monorail have increased considerably in recent times. This particularly concerns the transport of longwall system elements. In Poland, the maximum speed of suspended monorail travel is 2 m/s. Due to the fact that preparations are currently underway to increase the maximum speed above 2 m/s, it is necessary to inspect what influence it will have on work safety and mining support stability. Current operational experience and tests have shown that dynamic loads induced by the suspended monorail transportation have a significant influence on the roadway support stability, working protection durability and on the monorail operators. This is particularly true during the emergency braking of a suspended monorail by means of a braking trolley, where the overloads reach 3g. Bench tests of the selected steel arch and rock bolt support elements utilised in the Polish hard coal mines were conducted in order to determine the resistance of steel arch and rock bolt supports to static and dynamic loads. The article presents the results of the tests conducted on a steel arch support in the form of the sliding joints of an ŁP/V29 yielding roadway support, which is commonly employed in the Polish hard coal mines. Tests of elements of the threaded bolts with trapezoidal threads over the entire rod length were conducted as well. The conducted strength tests of steel arch and rock bolt support elements under static and dynamic loading have shown that dynamic loading has decisive influence on the support’s retaining of its stability. Support element stability decreases along with the increase of the impact velocity. This concerns both the steel arch support and the rock bolt support.

Słowa kluczowe

EN

mine transport; suspended monorail; transport-induced static support loading; transport-induced dynamic support loading; steel arch support resistance; rock bolt support resistance

• Wydawca: De Gruyter
• Czasopismo: Studia Geotechnica et Mechanica
• Rocznik: 2019
• Tom: Vol. 41, nr 2
• Strony: 81--92
• Opis fizyczny: Bibliogr. 14 poz., tab., rys.

Twórcy

autor

Pytlik Andrzej

• Central Mining Institute, Katowice, Poland

Bibliografia

• [1] Pieczora E., Suffner H. (2017). Rozwój napędów dołowych kolejek podwieszonych [Development of drives for underground suspended monorails]. Maszyny Górnicze no. 3/ 2017. Instytut Techniki Górniczej KOMAG, Gliwice, 44–57 (in Polish).
• [2] Pieczora E., Tokarczyk J. (2017). Rozwój transportu podziemnego wykorzystującego kolejki podwieszone [Development of mine underground transportation with use of suspended monorails]. Mining – Informatics, Automation and Electrical Engineering. Akademia Górniczo – Hutnicza im. Stanisława Staszica w Krakowie, No. 4 (532) 2017, 107–117 (in Polish).
• [3] Polski Komitet Normalizacyjny (2018). Polska Norma: Obudowa wyrobisk górniczych. Odrzwia podatne z kształtowników korytkowych. Wymagania wytrzymałościowe i badania [Polish Standard: Mine working support. Yielding frames constructed from channel sections. Strength requirements and testing]. PN-G-15022:2018-11. Warszawa (in Polish).
• [4] Pytlik, A., Rotkegel, M., Szot, Ł. (2016). Badania wpływu prędkości kolejek podwieszonych na siły w wybranych elementach trasy [The research on the impact of velocity of suspended monorails on forces in selected elements of a track]. Przegląd Górniczy, 72(11), 30–37 (in Polish).
• [5] Tokarczyk J., Kania J. (2016). Układy i trasy transportu kolejkami podwieszonymi z napędem własnym do przewozu ludzi w wyrobiskach poziomych oraz pochyłych o nachyleniu do 45° [Systems and tracks of self-powered suspended monorails for transportation of people in horizontal workings and workings with inclination up to 45°]. Mining – Informatics, Automation and Electrical Engineering. Akademia Górniczo – Hutnicza im. Stanisława Staszica w Krakowie, No. 3(527), 83–91 (in Polish).
• [6] Brodny, J. (2012). Identyfikacja parametrów pracy złącza ciernego stosowanego w górniczej obudowie podatnej wyrobisk korytarzowych [Work parameter identification of sliding joints utilised in yielding gallery working support systems]. Wydawnictwo Politechniki Śląskiej, Gliwice (in Polish).
• [7] Brodny, J. (2013). Analysis of operation of arch frictional joint loaded with the impact of freely falling mass. Studia Geotechnica et Mechanica, 35(1), 59–71.
• [8] Horyl, P., Šňupárek, R., Maršálek, P., Pacześniowski, K. (2017). Simulation of laboratory tests of steel arch support. Archives of Mining Sciences, 62(1), 163–176.
• [9] Pytlik, A. (2015). Process characteristics of hydraulic legs equipped with safety valves at dynamic load caused by a mining tremor. Archives of Mining Sciences, 60(2), 595–612.
• [10] Pytlik, A., Prusek, S., Masny, W. (2016). Methodology for laboratory testing of rockbolts used in underground mines under dynamic loading conditions. SAIMM Journal of The Southern African Institute of Mining and Metallurgy, 116(12), 1101–1110.
• [11] Pytlik, A. (2018). Tests on hydraulic props equipped with yield valves at dynamic load modelling a rock burst. Archives of Mining Sciences, 63(2), 477–489.
• [12] Polski Komitet Normalizacyjny (1998). Polska Norma: Kotwie górnicze. Wymagania [Polish Standard: Rock bolts. Requirements]. PN-G-15091:1998. Warszawa (in Polish).
• [13] Polski Komitet Normalizacyjny (1999). Polska Norma: Kotwie górnicze. Badania [Polish Standard: Rock bolts. Testing]. PN-G- 15092:1999. Warszawa (in Polish).
• [14] Polski Komitet Normalizacyjny (1997). Polska Norma: Górnicza obudowa indywidualna. Stojaki cierne. Wymagania i badania [Polish Standard: Single prop mine support. Friction props. Requirements and testing]. PN-G-15533:1997. Warszawa (in Polish).

Uwagi

PL

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2019).