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The compressive strength of coal in Yanlong mine area of China is less than 3 MPa. Basically, it is powdery. The roof and floor rocks are mudstone. Therefore, this coal seam is a typical “three soft” coal seam. Anchor and cable cannot be used due to low anchoring force. This paper describes how to support this type of soft coal roadway. The deformation characteristics of soft coal roadway were investigated. Results show the conventional U-shaped steel support is not subjected to uniform load, which bearing capacity can be improved by structural compensation, such as addition of horizontal and vertical beams made of U-shaped steel. In addition, by drilling pressure-relief holes in the ribs of a soft coal roadway, the stress distribution of surround rock in the roadway can be improved, which can transfer the high stress in the surrounding rock to deeper parts and reduce the pressure on the artificial support. A support method is to combine the strengthened U-shaped steel support with pressure-relieving drill holes, providing an economic and efficient way to support the very soft coal roadways.
PAPER REVISED: 2018-06-19
PAPER ACCEPTED: 2018-12-11
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THERMAL SCIENCE YEAR 2019, VOLUME 23, ISSUE Supplement 3, PAGES [S887 - S895]
  1. Dai X.D., et al., Statistics and Future Outlook of Global Energy in 2017. Natural Gas and Oil. 37(2017),1,pp. 94-99 (in Chinese)
  2. Li C Y., et al., The Characteristics of Coal Mine Pressure and the Design and Practice of the Hydraulic Support for the Three Soft Coal Seam. China Coal. (1995),6,pp. 28-32
  3. Shen S P., et al., Support Design and Practice for Large Section Roadway in Deep Three-Soft Coal Seam. Coal Engineering. 47(2015),10,pp. 45-47
  4. Gao, M Z., et al., Field Experiments on Fracture Evolution and Correlations between Connectivity and Abutment Pressure under Top Coal Caving Conditions. International Journal of Rock Mechanics and Mining Science, 111(2018), pp. 84-93
  5. Li Z Z., et al., Research and Implementation "Three Soft" Coal Roadway Supporting "Prestressed Steel Column". Coal Technology. 33(2014), 7, pp. 147-149
  6. Zheng Z W., et al., Optimization on Supporting Parameters of Three Soft Coal Seam Roadway Surrounding Rock with High Stress in Deep Mine. Coal Technology. 36(2017), 1, pp. 78-80
  7. Jiang Y J., et al., Study on Carrying Capacity of Bolt Support in "Three-soft" Coal Seam Roadway Drifting along Goaf. Coal Technology. 35(2016), 11, pp. 24-27
  8. Jiang Y J., et al., Research on Bolt Mash Supporting Technology for "Three Soft" Coal Seam Roadway in Zhaojiazhai Mine. Coal Technology. 35(2016), 6, pp. 28-30
  9. Deng P H., et al., Study of Key Technologies of Support in Three Soft Coal Seam Roadway. Coal Technology. 33(2014), 4, pp. 118-121
  10. Bian W D. Discussion on Grouting Technology of "Three Soft" Coal Seam Wall. Shandong Industrial Technology. (2013), 12, pp. 95
  11. Huang Z B. Practice of Combined Support of Roadway Anchor and Pillar in "Three Soft" Coal Seam. Coal Science & Technology Magazine. (2011), 4, pp. 67-68
  12. Li K G., et al., Mining Gateway Support Technology Under Multiple Mining Activities in Seam with Soft Roof, Soft Coal and Soft Floor. Coal Science and Technology. 38(2010),9,pp. 4-9
  13. Liu Z C., et al., Roadway Supporting Technology in Deep Three-soft Coal Seam in Baiji Coal Mine. Safety in Coal Mines. 61(2008), 12, pp. 61-62
  14. Wang X F., et al., Enhanced Support Technology for Key Area of the Roadway in Large Inclined Angle "Three-Soft" Coal Seam. Journal of Mining & Safety Engineering. 34(2017), 2, pp. 208-213
  15. Shi J H. Study on the Support Technology of Roadway Effected by Sliding Geological Structure in Three-soft Coa1 Seam of Gaocheng Coal Mine. China University of Mining and Technology. (2014)
  16. Zhang C G, et al., Three Soft Coal Roadway Strong Composite Supporting Technology. China Energy and Environmental Protection. (2012), 2, pp. 14-16
  17. Fan G J., et al., Compound Support in the Coal Mine "Soft" Research and Application of Coal Seam. Journal of North China Institute of Science and Technology. 8(2011), 1, PP. 37-40
  18. Sun G Y. Research on Reliability Theory of Mine Support System. Liaoning Technical University. (2003)
  19. Xie W B., et al., Structural Stability of U-Steel Support and Its Control Technology. Chinese Journal of Rock Mechanics and Engineering. 29(2010), S2, pp. 3743-3748

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