Bài viết dựa trên điều kiện địa chất lò chợ 4108 mỏ Ping Shou, ShanXi (Trung Quốc), sử dụng mô hình số hóa FLAC3D, mô phỏng quá trình khai thác lò chợ khi chiều cao lớp khấu là 4,2 m, sau đó tiến hành phân tích quy luật phân bố trạng thái ứng suất phía trước gương lò chợ khi chiều cao lớp khấu lớn. | Journal of Mining and Earth Sciences Vol. 62 Issue 5a 2021 11 - 17 11 Stress distribution ahead of mechanized longwall top coal caving face with great cutting height Tung Manh Bui 1 Hung Phi Nguyen 1 Tuan Van Nguyen 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 Longwall Top Coal Caving LTCC technology with great cutting height Received 18th is a new development trend in mining thick coal seam. The cutting height Accepted 09th May2021 of LTCC face typically ranges from m to m in many coal mining Available online 01st Dec 2021 countries but it recently reaches up to m in many coal mines in China. Keywords Because the cutting height increases the caving height accordingly Cutting height decreases that changes the stress distribution around coal face and law Longwall top coal caving of roof rock caving. Based on the geological condition of Longwall 4108 at Ping Shou coal mine ShanXi province China this paper presents a Recovery efficiency modelling of LTCC mining process with a cutting height of m by using Top coal the numerical program FLAC3D. From the modelling the paper presents Front abutment stress. an analysis of stress distribution ahead of LTCC face with great cutting height. The results show that as the coal face advances the stress magnitude ahead of coal face increases. The peak front abutment stress moves further away from coal face. The stress concentration ratio increases and stress concentration zone expands correspondingly. These changes of stress facilitate the failure of top coal increasing the efficiency of top coal recovery and improving longwall face stability. Copyright 2021 Ha noi University of Mining and Geology. All rights reserved. _ Corresponding author E - mail buimanhtung@ DOI 5a .02 12 Tạp chí Khoa học Kỹ thuật Mỏ - Địa chất Tập 62 Kỳ 5a 2021
