Supporting problems at an island mining face in Shanxi, China. Case study based on field observation

• Autorzy: Feng Xiaowe

Identyfikatory

DOI

10.2478/ntpe-2019-0027

• Języki publikacji: EN

Abstrakty

EN

In this paper, field observation is conducted in Fujiaao Coal Mine, Linfen city in Shanxi province, China, which is unique because of its island-typed mining layout. Firstly, geology, layout of the coal cutting face, supporting pattern are presented and details are also provided. Then the problems are discussed and analyzed based on existing bolting theories. It finds out the length of the cable bolt is too long, which requires long time to drill boreholes, whilst the effectiveness is limited due to the illogical combination between cable bolt function zone and rock bolt function zone. Also, the face place allocated to rock bolt is very likely to cause line contact between its edge and steel belt, thus the bearing force is tremendously weakened and solely determined by strength of belt. Furthermore, field observation proves the low active supporting effects to roof, thus leading obvious roof sink even without the disturbance of mining activity. Eventually, some solutions are proposed with the intention to improve the situation based on the economic and technical considerations, including bolting in humidity environment, rational cable bolt length, wise choice of face plate, and ways to increase pretension force. The viewpoints and comments of this study can be referred by practitioners in coal mines sharing same difficulties.

Słowa kluczowe

EN

coal mine support; bolt; support optimization; field observation; support failure

PL

podparcie w kopalni węgla; śruba; optymalizacja podparcia; obserwacja terenowa; uszkodzenie podparcia

• Wydawca: STE GROUP ; De Gruyter
• Czasopismo: New Trends in Production Engineering
• Rocznik: 2019
• Tom: Vol. 2, Iss. 1
• Strony: 257--267
• Opis fizyczny: Bibliogr. 7 poz., rys.

Twórcy

autor

Feng Xiaowe

• China University of Mining and Technology, China

Bibliografia

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• 2. Frith, R., Reed, G. and McKinnon, M. (2018). Fundamental Principles of an Effective Reinforcing Roof Bolting Strategy in Horizontally Layered Roof Strata and Areas of Potential Improvement. International Journal of Mining Science and Technology, 28, pp. 67-77.
• 3. Kang, H., Wu, Y., Gao, F., et al (2013). Fracture Characteristics in Rock Bolts in Underground Coal Mine Roadways. International Journal of Rock Mechanics and Mining Sciences, 62, pp. 105-112.
• 4. Kang, H., Wu, Y., Gao, F., et al (2016). Mechanical Performances and Stress States of Rock Bolts Under Varying Loading Conditions. Tunnelling and Underground Space Technology, 52, pp. 138-146.
• 5. Li, CC., (2010). Field Observations of Rock Bolts in High Stress Rock Masses. Rock Mechanics & Rock Engineering, 43, pp. 491-496.
• 6. Mo, S., Tutuk, K. and Saydam, S. (2019). Management of Floor Heave at Bulga Underground Operations - A Case Study. International Journal of Mining Science and Technology, 29, pp. 73-78.
• 7. Zhang, N., Wang, C., Xu, XL., et al (2011). Argillisation of Surrounding Rock Due to Water Seepage and Anchorage Performance Protection. Materials Research Innovations, 15, pp. 582-585.