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Công tác khấu than ở lò chợ tạo nên các khoảng trống, làm mất thế cân bằng tự nhiên của ứng suất trong lòng đất, gây nên các hiện tượng dịch chuyển biến dạng đất đá và phá hủy công trình, môi trường. Trong phạm vi bài viết, các tác giả sử dụng phương pháp mô hình số để đánh giá ảnh hưởng của khai thác ở lò chợ vỉa L7 cánh Đông đến các công trình trên mặt thuộc cụm kho G9 mỏ than Mông Dương. | 18 Journal of Mining and Earth Sciences Vol. 62 Issue 5a 2021 18 - 27 Application of numerical modelling method for determination of underground mining s impact on constructions in G9 coal storage at Mong Duong coal mine by using program UDEC2D Hung Duc Pham 1 Dung Tien Van Mac 2 1 Faculty of Mining Hanoi University of Mining and Geology Vietnam 2 Vietnam National Coal - Mineral Industries Holding Corporation Limited Vietnam ARTICLE INFO ABSTRACT Article history The coal extraction in longwall creates voids that destroy the natural Received 28th Feb. 2021 stress balance in underground. This causes deformation and failure of Accepted 18th May 2021 rock and consequently damage of surface construction and environment. Available online 01st Dec. 2021 In Vietnam surface construction damage caused by underground mining Keywords is quite common such as fan station at level 142 m Mao Khe coal mine G9 coal storage water burst at roadway level -60 m Thong Nhat coal mine road crack Mong Duong coal mine near Yen Tu pagoda or surface subsidence at Khe Cham coal preparator. Due to the displacement magnitude and nature of damaged constructions Soil and rock deformations such as private house industrial building or railway a coal mine may Underground mining. need to stop production and suffers great economic loss. The East wing of L7 coal seam is medium in thickness and gentle-inclined in dip angle. It completely underlays the G9 storage at Mong Duong coal mine. According to the mining schedule this seam is planned to be extracted by drilling- and-blasting method and be supported by self-moving hydraulic frame GK. This poses a safety risk to equipment operating in the storage. It is extremely necessary to find a reasonable mining solution to ensure the safety of G9 coal storage constructions and minimize the loss of resources for this L7 coal seam. In this paper the author uses numerical modelling method to determine the impact of underground mining on surface constructions in G9
