In order to solve the problem of surrounding rock control in soft coal seam roadway, taking the centralized return airway of No.2 coal seam in Liangdu Coal Industry as the research background, the mechanical conditions of roadway surrounding rock were analyzed by means of field investigation, rock mechanics experiment and numerical simulation. The design principles of roadway support in soft coal seam were put forward: high strength anchor cable support, high preload support and high stiffness support. The bearing capacity of surrounding rock was strengthened by anchor cable support, and the deformation and failure of surrounding rock were effectively controlled. Through the numerical simulation method, the deformation and plastic failure range of roadwaysunder different support schemes are compared and analyzed. The support scheme of centralized transportation roadway is studied and determined, and the field test is carried out, which effectively controls the deformation of surrounding rock of roadway in weak coal seam.
References
[1]
Kang, H.P. (2021) Seventy Years Development and Prospects of Strata Control Technologies for Coal Mine Roadwaysin China. Chinese Journal of Rock Mechanics and Engineering, 40, 1-30. (In Chinese)
[2]
Yu, H. (2018) Reinforcement Technology of High-Strength Prestressed Anchor Cable Roadway under the Influence of Dynamic Pressure. Coal, 27, 40-41. (In Chinese)
[3]
Zhao, X.J., Yang, Z.B., Zhang, B., et al. (2022) Research on High Pretension Lengthened Anchorage Support Technology for Deep Broken Surrounding Rock. Coal Technology, 41, 8-12. (In Chinese)
[4]
Kang, H.P., Fan, M.J., Gao, F.Q., and Zhang, H. (2015) Deformation and Support of Rock Roadway at Depth More than 1000 Meters. Chinese Journal of Rock Mechanics and Engineering, 34, 2227-2241. (In Chinese)
[5]
Li, C., Xu, J. and Li, M. (2013) The Mechanical Characteristics Analysis of Fully Anchored Pre-Stressed Bolts in Coal Mines. Journal of Mining & Safety Engineering, 30, 188-193. (In Chinese)
[6]
Wei, S.J. and Gou, P.F. (2012) Analogy Simulation Test on Strengthening Effect for Pretention of Bolts on Anchorage Body. Journal of China Coal Society, 37, 1987- 1993. (In Chinese)
[7]
Gou, P.F., Xin, Y.J., Zhang, H. and Shen, Y.M. (2012) Stability and Failure Analysis of Roof Anchors in a Deep Mine Gateway. Journal of China University of Mining & Technology, 41, 712-718. (In Chinese)
[8]
Wang, H.T., Wang, Q, Jiang, J.P., et al. (2019) Supporting Mechanism and Application of Full-Length Prestressed Bolt-Grouting in the Deep Roadways. Journal of Mining and Safety Engineering, 36, 670-677, 684. (In Chinese)
[9]
Zhao, W.L. and Yang, Z.B. (2018) Study on Strength Bolt-Grouting Support Technology in Deep Soft Rock Roadway. Coal Science and Technology, 46, 92-97. (In Chinese)
[10]
Li, W. and Cheng, J.L. (2010) Research and Application of High Strength and High Preload Bolt Support Technology in Deep Coal Roadway. Coal Engineering, No. 1, 30-31, 33. (In Chinese)
[11]
Lei, S., Gao, F.Q. and Wang, X.Q. (2021) Study on Statistics and Classification of Uniaxial Compressive Strength of Coal. Coal Science and Technology, 49, 64-70. (In Chinese)
[12]
Wang, J.H. (2012) Analysis on Mechanism and Effect of Rock Bolts and Cables in Gateroad with Coal Seam as Roof. Journal of China Coal Society, 37, 1-7. (In Chinese)
[13]
Xiao, T,Q., Bai, J.B., Wang X.Y., Chen, Y. and Yu, Y. (2011) Stability Principle and Control of Surrounding Rock in Deep Coal Roadway with Large Section and Thick Top-Coal. Geotechnics, 32, 1874-1880. (In Chinese)
[14]
Kang, H.P., Yu, B., et al. (2016) High Prestress Anchor Bolt Support Technology for Full Coal Roadway of Thick Coal Seam and Example Analysis. Jinneng Holding Science and Technology, No. 4, 1-8. (In Chinese)
[15]
Sun, G.Y. and Luo, X. (2013) Numerical Simulation Analysis of Different Coal Mine Roadway Support Effect. Advanced Materials Research, 2013, 807-809.
https://doi.org/10.4028/www.scientific.net/AMR.807-809.2356
[16]
Zhang, H., Li, Y.M., Wang, X.J., Yu, S.D. and Wang, Y. (2023) Study on Stability Control Mechanism of Deep Soft Rock Roadway and Active Support Technology of Bolt-Grouting Flexible Bolt. Minerals, 13, Article No. 409.
https://doi.org/10.3390/min13030409
[17]
Zou, Q.L. (2019) Reinforcement Technology of Fully Mechanized Working Face Passing through Fault Fracture Zone. Shandong Coal Science and Technology, 7, 75-76. (In Chinese)
[18]
Lin, H. (2011) Study of Soft Rock Roadway Support Technique. Procedia Engineering, 26, 321-326. https://doi.org/10.1016/j.proeng.2011.11.2174
[19]
Bian, T. and Liu, J.Y. (2022) Study on Super-Large Cross Section coal Opening and Supporting. Coal Engineering, 54, 49-52. (In Chinese)
[20]
Li, W., Li, S., Xuan, C., et al. (2015) Mechanism and Control of Failure of Rock Roadway Support in Highly Stressed Soft Rock. Chinese Journal of Rock Mechanics and Engineering, 34, 1836-1848. (In Chinese)
[21]
Hou, C.J. (2017) Effective Approach for Surrounding Rock Control in Deep Roadway. Journal of China University of Mining & Technology, 46, 467-473. (In Chinese)
