Bài viết sử dụng phần mềm FLAC 3D để mô phỏng đường lò với các loại hình dạng tiết diện ngang khác nhau đào trong cùng một điều kiện địa chất. Các kết quả trích xuất từ mô phỏng số như là giá trị chuyển vị, trường ứng suất, vùng biến dạng dẻo, chiều dày vùng biến dạng dẻo tại nóc, hông, nền lò, được đưa về cùng một hệ qui chiếu không đơn vị. | 62 Journal of Mining and Earth Sciences Vol. 63 Issue 2 2022 62 - 70 Application of the numerical method to analyze the effect of cross-sectional type in stabilizing the coal mine tunnel Nhan Thi Pham 1 Fuzhou Qi 2 1 Faculty of Civil Engineering Hanoi University of Mining and Geology Vietnam 2 School of Civil amp Architecture Engineering Zhong Yuan University of Technology China ARTICLE INFO ABSTRACT Article history For the coal mine tunnel each type of cross-section of the tunnel will cause Received 14th Nov. 2021 different laws of mechanical change in the rock mass around the tunnel. Accepted 24th Mar. 2022 This difference is expressed through quantities such as displacement stress Available online 30th Apr. 2022 the damage zones within rock mass etc. It is completely unreasonable to Keywords adopt an independent mechanical parameter to evaluate the selection of Cross-section the most optimal shape for the tunnel. To simulate the tunnel excavation Displacement process with different types of cross-section shapes in the same geological conditions the software FLAC3D was employed. The data extracted from Plastic deformation numerical simulation including displacement stress field plastic Stress deformation area the thickness of plastic deformation zone at the top side Tunnel. and bottom of the tunnel are evaluated. The type of section shape with the highest score will be evaluated as the most optimal one. The present case study shows that the type of cross-sectional shape of the straight wall with curved arch and deviated trapezoid got the highest scores of 36 points and 30 points respectively. Therefore the type of cross-sectional shape of the straight wall with curved arch and deviated trapezoid should be used. This shape choice will be the most optimal and beneficial to the stability of the tunnel both during excavation and production progress. Copyright 2022 Hanoi University of Mining and Geology. All rights reserved. _ Corresponding author E - mail .
