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Phương pháp luận về chuẩn bị ruộng mỏ bằng phương pháp tác động phức hợp đối với vỉa than có độ chứa khí mêtan cao

Mục đích của nghiên cứu nhằm xây dựng phương pháp chuẩn bị ruộng mỏ thích hợp để giảm thiểu nguy cơ phát thải khí mêtan gây mất an toàn trong khu vực khai thác. Bài viết đề xuất sử dụng kết hợp các phương pháp tác động khác nhau thông qua các lỗ khoan nhằm kiểm soát khả năng giải phóng khí mêtan từ vỉa. | Journal of Mining and Earth Sciences Vol. 62 Issue 6a 2021 69 - 75 69 Methodology for preparing coal seams with high methane content by complex impact method Dung Tien Thai Vu 1 Thanh Van Tran 2 Mien Van Nguyen 3 Tinh Van Do 4 1 Facultyof Mining Hanoi University of Mining and Geology Vietnam 2 Vietnam Mining Science and Technology Asscociation Vietnam 3 Dong Bac Corporation Ministry of National Defence Vietnam 4 Vietnam National Coal Mineral Industries Holding Corporation Limited Vietnam ARTICLE INFO ABSTRACT Article history Safety is always a top priority in underground coal mining especially when Received 12th May 2021 mining at great depths which is accompanied by an increase in methane Accepted 10th July 2021 content of the coal seams. The high concentration of methane in mine airstream Available online 01st Dec. 2021 is cause of many negative effects on various underground works. In some cases Keywords when the methane content in underground areas reaches the limit value mine Gas emission fires can occur with great loss of people and equipment. In many countries High methane content where the coal mining industry is developed practical experience in deep mining has shown that current popular methods of coal seams preparation can Impact vibration not always bring absolute safety in working faces especially when extracting Low permeability and recovering coal seams with high methane content. The purpose of this study Preparation of coal seams. is to develop an appropriate coal seam preparation method that can minimize the risk of methane emissions which is one of the causes of unsafety in the underground coal mining. In this paper the authors propose to use a combination of different impact methods through boreholes to control the intensity of methane release from high methane content coal seams. The combined use of hydraulic and vibration methods will greatly increase the network of man-made cracks in the coal mass which allows methane to escape more easily .