Tạp chí
 
Năm 2025
 
Số 6 [12 - 2025], Năm thứ XXXIV

Numerical Study on Stability of Retained Roadway in Non-Pillar Mining at Nam Mau Coal Mine

https://tapchi.hoimovietnam.vn/vi/archives?article=25064

  • Cơ quan:

    1 Vietnam Mining Science and Technology Association, 226 Le Duan, Hanoi, Vietnam
    2 Hanoi University of Mining and Geology, 18 Vien Str., Hanoi, Vietnam

  • *Tác giả liên hệ:
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  • Nhận bài: 15-10-2025
  • Sửa xong: 18-11-2025
  • Chấp nhận: 20-11-2025
  • Ngày đăng: 31-12-2025
Trang: 4 - 12
Lượt xem: 199
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Tóm tắt:

By using numerical modelling method, the study aims to better understand the geomechanicalbehaviours of roof strata and stability of retained roadway in the non-pillar mining method at Nam Maucoal mine. The analysis of numerical model shows that when theface is far away from the retainedroadway, the mining does not cause significant impact on roadway stability. When the face approachesthe roadway, the vertical stress gradually increases around the roadway. The stress reaches a peak valuewhen the faceis from 10 to 20 m away and then rapidly decreases when the roadway complete falls withinthe stress relief zone of longwall. In combination with the insignificant concentration of horizontal stress,the surrounding stress condition induces the roadway todeform and fail when the face approachesroadway. The study finds that the roadway is significantly affected when the face is adjacent to it. Therock mass around roadway fails up to 25 m towards the unmined area. At the end of the upper panelmining, onlyimmediate roof caves that form a caving line of less than 70 degrees to seam floor. Thestrong main roof does not cave but sag downwards, causing significant load on roadway. The results inthis paper can serve as fundamental knowledge for efficient design of roof cutting techniques, contributingto reducing the cost of using non-pillar mining method into Vietnam coal industry.

Trích dẫn
NguyenTrung Pham, Minh Khanh Pham, Duong Quang Luu và Tien Dung Le, 2025. Numerical Study on Stability of Retained Roadway in Non-Pillar Mining at Nam Mau Coal Mine, Tạp chí Công nghiệp Mỏ, số XXXIV, kỳ 6, tr. 4-12.
Tài liệu tham khảo

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[6]. Google Maps (2025).Location of Nam Mau coal mine. Available from:https://www.google.com/maps/place/Th%C6%B0%E1%BB%A3ng+Y%C3%AAn+C%C3%B4ng,+U%C3%B4ng+B%C3%AD,+Qu%E1%BA%A3ng+Ninh,+Vi%E1%BB%87t+Nam/@21.1221451,106.6601081,14672m/data=!3m2!1e3!4b1!4m6!3m5!1s0x314a8f44887b4ff7:0x2477a6bb6b906b67!8m2!3d21.1174331!4d106.7352584!16s%2Fg%2F1hb_g19cp?entry=ttu&g_ep=EgoyMDI1MTAxNC4wIKXMDSoASAFQAw%3D%3D.

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[12]. Dang Van Kien, Vo Trong Hung, Do Ngoc Anh, Do Ngoc Thai & Dao Van Chi (2020). Stability ofDeep Underground Mine Drift through Complex Geology Conditions in Quang Ninh Coal Area.Inżynieria Mineralna–Journal of the Polish Mineral Engineering Society, 46(2), 221-230. DOI:https://doi.org/10.29227/IM-2020-02-27.

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