Stress distribution ahead of mechanized longwall top coal caving face with great cutting height

  • Affiliations:

    1 Hanoi University of Mining and Geology, Hanoi, Vietnam
    2 Vietnam National Coal - Mineral Industries Holding Corporation Limited, Hanoi, Vietnam

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  • Received: 18th-Feb-2021
  • Revised: 9th-May-2021
  • Accepted: 15th-June-2021
  • Online: 1st-Dec-2021
Pages: 11 - 17
Views: 1568
Downloads: 908
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Abstract:

Longwall Top Coal Caving (LTCC) technology with great cutting height is a new development trend in mining thick coal seam. The cutting height of LTCC face typically ranges from 2.8 m to 3.2 m in many coal mining countvies, but it recently reaches up to 4.2 m in many coal mines in China. Because the cutting height increases, the caving height accordingly decreases that changes the stress distribution around coal face and law of roof rock caving. Based on the geological condition of Longwall 4108 at Ping Shou coal mine, ShanXi province, China, this paper presents a modelling of LTCC mining process with a cutting height of 4.2 m by using the numerical program FLAC3D. From the modelling, the paper presents 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.

How to Cite
Bui, T.Manh, Nguyen, H.Phi and Nguyen, T.Van 2021. Stress distribution ahead of mechanized longwall top coal caving face with great cutting height (in Vietnamese). Journal of Mining and Earth Sciences. 62, 5a (Dec, 2021), 11-17. DOI:https://doi.org/10.46326/JMES.2021.62(5a).02.
References

Bùi Mạnh Tùng, Nguyễn Phi Hùng, Nguyễn Văn Thịnh, (2016). Nghiên cứu hoàn thiện các thông số công nghệ nhằm nâng cao hiệu quả khai thác than lò chợ dài hạ trần cơ giới hóa vỉa dày dốc thoải vùng Quảng Ninh. Đề tài cấp cơ sở. Trường Đại học Mỏ - Địa chất, 16.

FLAC3D2.0. (1996). Itasa Consulting Group. Ins. FLAC Version 2.0.

Gong Peilin, Jin Zhongming, Hao, Haijin, (2001). Research on stability test for fully mechanized mining support with large mining heigh. Proceeding of Second International Symposimum on Mining Technology. 246-251.

Gong Peilin, (2008). Surrounding rock cotrol theory and application study of the coal face with greater mining height. China Univestity of Mining and Technolory Press. 1-7.

He Fulian, Qian Minggao, Zhu Deren, (2011).  A study of the interaction between supports and Surrounding rocks in longwall mining face with large mining height. Strata control and Sustainable coal mining. 380-384.

Jun Wang, Pengqi Qiu, Jianguo Ning, Li Zhuang, Shang Yang. (2019) A numerical study of the mining-induced energy redistribution in a coal seam adjacent to an extracted coal panel during longwall face mining: A case study. Enegy Science and Engineering. https://doi.org/ 10.1002/ese3.553. 

Shanxi China National Coal Pingshuo Antaibao Coal Co Ltd. Analysis on the structural characteristics of the No.3 Jingong Mine in Pingshuo Mining Area, Shuozhou City, Shanxi Province. CNKI: SUN: ZGMT.0.2019-12-006.

Tien Dung Le, Xuan Nam Bui (2019). Status and prospects of underground coal mining technology in Vietnam. Inżynieria Mineralna – Journal of the Polish Mineral Engineering Society, 44(2): 104-110.