Full-Section Support Technology for Mining Roadways in "Three-Soft" Unstable Thick Coal Seams

ZongMin Song

doi:10.63313/AJET.9060

Authors

ZongMin Song School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo, Henan 454000, China Author

DOI:

https://doi.org/10.63313/AJET.9060

Keywords:

, Mining Roadway, Full-Section Anchor Cable, Floor Grouting Anchor Cable

Abstract

The main coal seam of Xingcun Coal Mine is a typical "three-soft" unstable coal seam, where mining roadways suffer from severe deformation and cannot remain stable despite repeated repairs and expansions during service. In this study, borehole inspection was employed to detect the development of fractures in the surrounding rock of the mining roadway, and numerical simulation was conducted to compare and analyze the plastic zone distribution and displacement characteristics of the roadway surrounding rock under four support schemes: U-shaped steel support alone; U-shaped steel support combined with roof and sidewall anchor cables; U-shaped steel support combined with full-section anchor cables; and U-shaped steel support combined with full-section anchor cables and grouting. The differences among these support schemes in controlling surrounding rock stability were elucidated. On this basis, a combined support scheme of "U-shaped steel support + full-section anchor cables + grouting" was proposed. The results indicate that the deformation of the roadway surrounding rock and the floor heave were significantly reduced, and the roadway maintained a favorable profile. During the observation period, the convergence between the two sidewalls and between the roof and floor was controlled within 97 mm and 75 mm, respectively, achieving a remarkable surrounding rock control effect. The findings can provide a reference for surrounding rock control in mining roadways under similar geological conditions.

References

[1] Kang, H. P. (2021). Seventy years of development and prospects of surrounding rock control technology for coal mine roadways in China. Chinese Journal of Rock Mechanics and Engineering, 40(1), 1–30.

[2] Hou, C. J. (2013). Surrounding rock control in roadways (pp. 288–390). Xuzhou: China University of Mining and Technology Press.

[3] Li, G. C., Yang, S., Sun, Y. T., et al. (2022). Research progress on surrounding rock control technology for roadways under complex conditions. Coal Science and Technology, 50(6), 29–45.

[4] Zhang, P. (2023). Supporting technology for high-stress "three-soft" coal seam roadway under sliding structure. Coal Science & Technology Magazine, 44(2), 151–156.

[5] Su, J. H., Ren, J. W., Xin, Y. J., et al. (2023). Support technology for mining roadways with fractured roof in close-distance sliding structure zones. Energy and Environmental Protection, 45(8), 277–283.

[6] Wang, X. K., Xie, W. B., Jing, S. G., et al. (2018). Experimental study on large deformation control mechanism of extremely loose coal roadway surrounding rock in sliding structure zones. Chinese Journal of Rock Mechanics and Engineering, 37(2), 312–324.

[7] Liu, C. X. (2006). Analysis of the characteristics of the Huadong sliding structure in Songshan, Henan. Zhongzhou Coal, 143, 24–25.

[8] Song, C. S., Zhu, Q. Q., Ren, J. W., et al. (2022). Study on in-situ stress characteristics of coal mines in sliding structure zones. Coal Technology, 41(9), 1–5.

[9] Qin, J. B. (2016). Application study on synergistic support of U-shaped steel arch combined with anchor cables and cable grouting.Coal Mine Modernization, 4, 38–40.

[10] He, S. P., Li, F. L., Gou, P. F., et al. (2025). Reform and practice of mining roadway support in "three-soft" coal seams at Xingcun Coal Mine. Energy and Environmental Protection, 47(4), 274–281.