Study on ratio of cutting height to caving height for efficient top coal recovery in extra thick and gently inclined coal seam – a case study of seam 7 Ha Lam coal mine, Vietnam

• Autorzy: Pham Duc Hung , Le Tien Dung , Nguyen Phi H. , Pham Van Quan

Identyfikatory

DOI

10.46873/2300-3960.1445

• Języki publikacji: EN

Abstrakty

EN

The mechanized longwall top-coal caving technology (LTCC) has been used in Quang Ninh underground coal mines owned by Vietnam National Coal – Mineral Industries Holding Corporation Limited (Vinacomin). The application of the LTCC technology has achieved significant achievements, contributing to the production of coal for national economy development. The use of LTCC has shown that the top coal recovery efficiency is directly affected by the sequence of top coal drawing, ratio of cutting height to caving height, and caving span. These parameters, especially for extracting thick and gently inclined coal seam conditions as in the Quang Ninh coal field, have not been satisfactorily investigated in previous studies, which limits the advantages of this advanced mining technology. By using the numerical software PFC 3.1 as the main analysis tool, this paper studies the relationship between cutting height and caving height for efficient top-coal recovery in extra thick and gently inclined coal seam. Taking the condition of Seam 7, Ha Lam coal mine as a case study, the paper recommends the mine to re-organize its operation with a cutting height-to-caving height ratio of 1:5.25 and caving span of 1.2 m per mining cycle for maximum efficiency of the LTCC operation.

• Wydawca: Elsevier ; Główny Instytut Górnictwa
• Czasopismo: Journal of Sustainable Mining
• Rocznik: 2025
• Tom: Vol. 24, iss. 2
• Strony: 203--213
• Opis fizyczny: Bibliogr. 16 poz.

Twórcy

autor

Pham Duc Hung

• Faculty of Mining, Hanoi University of Mining and Geology, Viet Nam

• https://orcid.org/0000-0003-4871-4929

autor

Le Tien Dung

• Faculty of Mining, Hanoi University of Mining and Geology, Viet Nam

• https://orcid.org/0000-0002-0212-888X

autor

Nguyen Phi H.

• Faculty of Mining, Hanoi University of Mining and Geology, Viet Nam

• https://orcid.org/0000-0003-1575-7957

autor

Pham Van Quan

• Department of Investment Consultancy, Institute of Mining Science and Technology e Vinacomin, Viet Nam

• https://orcid.org/0009-0001-0530-3559

Bibliografia

• [1] Huang F. Mining technology and synchronization of face equipment for mechanized longwall top-coal caving. China University of Mining Science and Technology; 2002.
• [2] Liu K. Automation of technological stages in mechanized mining. China University of Mining Science and Technology; 2008.
• [3] Zhang D. Strata control at the face with fully mechanized sub-level caving. In: The sixth international symposium on mine planning and equipment selection. Ostrava, Czech Republic: A. A. Balkema; 1997.
• [4] Wang J, et al. Drawing mechanisms for top coal in longwall top coal caving (LTCC): a review of two decades of literature. Int J Coal Sci Technol 2021;8(6):1171e96.
• [5] Vakili A. Cavability assessment in longwall top coal caving technology. In: School of mining engineering. Sydney: The University of New South Wales; 2009.
• [6] Balasubrahmanyam N, Budi G. Critical aspects of longwall top coal caving method for application in Indian geomining conditions. In: Proceedings of geotechnical challenges in mining, tunneling and underground infrastructures. Singapore: Springer Nature Singapore; 2022.
• [7] Le TD, Bui XN. Status and prospects of underground coal mining technology in Vietnam. Inzynieria Mineralna 2019; 44(2):104e10.
• [8] Dinh VC. Research on use of artificial pillar construction technology in replacement of coal pilllar for roadways in mining at Quang Ninh underground coal mines. In: Department of underground mining. Hanoi: Hanoi University of Mining and Geology; 2022. p. 168.
• [9] Bui MT, Le TD, Vo TH. Stress distribution around mechanized longwall face at deep mining in Quang Ninh underground coal mine. Inzynieria Mineralna 2021;48(2):167e76.
• [10] Le QP, et al. Strata movement when extracting thick and gently inclined coal seam from a physical modelling analysis: a case study of Khe Cham basin, Vietnam. Sustain Dev Mt Territ 2019;11(4):561e7.
• [11] Vinacomin industry investment consulting joint stock company, project on investment and extraction of ha Lam coal mine for level below-50. Hanoi: Vinacomin Industry Investment Consulting Joint Stock Company; 2013.
• [12] Ha Lam Coal Company. Report on mechanisation of underground coal mining. Quang Ninh: Ha Lam Coal Company; 2018.
• [13] Pham DH, Do AS, Nguyen VQ. Analysis of technical factors of affecting the mining efficiency of mechanized longwall top coal caving. J Min Earth Scie 2016;57(12):39e43.
• [14] Yuan Y. A study on the reasonable cutting height to caving height ratio in mining thick seams. China University of Mining and Technology; 2011.
• [15] Shi Y, Ning Y, Qi Q. Strata control and technology optimization for fully mechanized coalface using top-coal caving. China University of Mining Science and Technology; 2006.
• [16] Pham DH, et al. Technical solution to ensure safety when exploiting reservoir 11 under open pit - Ha Lam Vinacomin Coal Joint Stock Company. In: Earth sciences and natural resources for sustainable development (ERSD 2018). Hanoi: Transport Publishing House; 2018.