Optimizing the Width and Compressive Strength of Artificial Protective Pillar in the Mining of Medium-Thick Coal Seams in Quang Ninh Using the Numerical Model

• Autorzy: Bui Manh Tung , Dinh Van Cuong

Identyfikatory

DOI

10.29227/IM-2023-02-23

Warianty tytułu

PL

Optymalizacja szerokości i wytrzymałości na ściskanie sztucznego filaru ochronnego w eksploatacji średniogrubych pokładów węgla w Quang Ninh z wykorzystaniem modelu numerycznego

• Konferencja: POL-VIET 2023 — the 7th International Conference POL-VIET
• Języki publikacji: EN

Abstrakty

EN

Currently, in many countries with the coal mining industry, the technology of using artificial pillars has been successfully applied to replace coal pillars to protect the entry gate road, thereby reducing the rate of resource loss, as well as the cost of entry gate road, and mining costs. However, in order to optimize the required width and compressive strength of artificial pillars with thickness, slope angle and mining depth, more detailed studies are required for each specific geological condition. This research uses Phase 2 numerical simulation software to analyze the stability of artificial protective pillar of the roadway prepared in the mining of medium-thick coal seams in the Quang Ninh coal region (Vietnam). The research results show that the relationship between the width of the artificial pillar and the slope angle follows the rule of a linear function. The size of the artificial protection pillar increases according to the mining depth. When the mining depth is 350m, the size of the pillar changes from 1.0 ÷ 2.4m, and to 1.4 ÷ 2, 8m at a depth of 500m. When the slope angle increases, the required pillar width also increases. That is due to the fact that at a large slope angle, the pressure acting on the pillar is not at the center, but deflects to the side adjacent to the entry gate road that needs to be protected, the compression force is not distributed evenly. The required compressive strength of the artificial pillar varies according to the condition of the slope angle, when the seam slopes 10°, the required compressive strength is from 8 to 12 MPa, when the slope angle increases to 20°, the required compressive strength of the pier increases to 18 ÷ 28 Mpa, but when the slope angle increases to 35°, the required compressive strength of the pillar tends to decrease to 16 ÷ 17 MPa. Thus, when operating in the corresponding conditions, it is necessary to choose the size and required compressive strength of the artificial pillar to ensure the working capacity of the pillar.

Słowa kluczowe

EN

medium thick coal seam; entry gate road; artificial support pillar; pillar width; compressive strength

PL

górnictwo; filary; koszty

• Wydawca: Polskie Towarzystwo Przeróbki Kopalin
• Czasopismo: Inżynieria Mineralna
• Rocznik: 2023
• Tom: no. 2, vol. 1
• Strony: 143--154
• Opis fizyczny: Bibliogr. 15 poz., rys., tab., wykr., zdj.

Twórcy

autor

Bui Manh Tung

• Faculty of Mining, Hanoi Univesity of Mining and Geology, Hanoi, Vietnam

autor

Dinh Van Cuong

• Faculty of Mining, Ha noi Univesity of Mining and Geology, Hanoi, Vietnam

Bibliografia

• 1. Cuong, D.V., Thanh, V.T., Tuan, A.N., 2019. Study on the possibility of using artificial pillars to replace the protection coal pillar of the preparationroadways during the mining process at underground coal mines in Quang Ninh region, Vietnam. Journal of the Polish Mineral Engineering Society, http://doi.org/10.29227/IM-2019-02-73.
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• 3. Song, Z.Q, Cui, Z.D., Xia. H.C., Tang, J.Q., Wen, Z.J., 2010. The fundamental theoretical and engineering research on the green safe no coal pillar mining model mainly using coal gangue backfill. Journal of China Coal Society, No.05, Vol.35. DOI:10.13225/j.cnki.jccs.2010.05.017
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• 5. Zhou, Y. J., Xu, X. D., Li, X. T., Li, M., and Yang, Y. G.,2018. Study on catastrophe instability of support system in gypsum goaf based on energy dissipation theory. Adv. Civ. Eng. 2018, 1–9. doi:10.1155/2018/4293584.
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Uwagi

Opracowanie rekordu ze środków MEiN, umowa nr SONP/SP/546092/2022 w ramach programu „Społeczna odpowiedzialność nauki” - moduł: Popularyzacja nauki i promocja sportu (2022-2023)