Geotechnical and Geological Engineering

, Volume 36, Issue 4, pp 2577–2591 | Cite as

Analysis on Rockbolt Support Interaction with Roof Dilatancy Above Roadside Backfill Area in Gob-Side Entry Retaining

  • Zizheng ZhangEmail author
  • Weijun Wang
  • Shuqing Li
  • Xianyang Yu
Original paper


To overcome the challenge to the roof dilatancy deformation control above roadside backfill area of gob-side entry retaining for confining pressure decreasing, a mechanical model of rockbolt reinforcement to the roof above roadside backfill area was established. The shear strength of the shear sliding zone above roadside backfill area considering rockbolt support was deduced. Factors and effect of rockbolt reinforcement to the shear sliding zone of the roof above roadside backfill area based on the 3107 working face of Xinyuan coal mine were obtained. Moreover, a numerical model was established to analyze rockbolt support for roof dilatancy deformation control. Mechanical results show that the shear strength increment from rockbolt axial force is positively related with rockbolt arrange density and rockbolt pretension while the shear strength increment from rockbolt shear force is positively related with rockbolt diameter, rockbolt arrangement density. Numerical results indicate that rockbolt support improves the confining pressure environment around the gateway excavation and effectively restrains roof dilatancy deformation of lower confining pressure region. Field tests and field monitoring indicated that the gob-side entry retaining in the 3107 working face with a width of 2.0 m roadside backfill body and high-strength rockbolt support for the roof above roadside backfill area could meet the requirement for gas drainage and ventilation when 3107 working face was retreating.


Gob-side entry retaining Rockbolt support Dilatancy Roadside backfill area 



This work is supported by National Natural Science Foundation of China (Nos. 51574227, 51434006), the Open Projects of Research Center of Coal Resources Safe Mining and Clean Utilization, LNTU (LNTU16KF04), and the Key technology projects for the prevention and control of major accidents in safe production of State administration of Work Safety in China (hunan-0001-2017AQ).


  1. Chen Y, Bai J, Wang X, Ma S, Xu Y, Bi T, Yang H (2012a) Support technology research and application inside roadway of gob-side entry retaining. J China Coal Soc 37(6):903–910Google Scholar
  2. Chen Y, Bai J, Zhu T, Yan S, Zhao S, Li X (2012b) Mechanisms of roadside support in gob-side entry retaining and its application. Rock Soil Mechan 33(5):1427–1432Google Scholar
  3. Guo Y, Bai J, Hou C (1992) Study on the main parameters of gateside packs in gateways maintained along gob-edges. J China Univ Min Technol 21(4):1–11Google Scholar
  4. Guo Z, Mou W, Huang W, Duan H (2016) Analysis on roadside support method with constant resistance yielding-supporting along the goaf under hard rocks. Geotech Geol Eng 34(3):827–834. CrossRefGoogle Scholar
  5. Holmberg M (1991) The mechanical behaviour of untensioned grouted rocks bolts. Royal Institute of Technology, StockholmGoogle Scholar
  6. Hua X, Ma J, Xu T (2005) Study on controlling mechanism of surrounding rocks of gob-side entry with combination of roadside reinforced cable supporting and roadway bolt supporting and its application. Chin J Rock Mechan Eng 24(12):2107–2112Google Scholar
  7. Kang H, Niu D, Zhang Z, Lin J, Li Z, Fan M (2010) Deformation characteristics of surrounding rock and supporting technology of gob-side entry retaining in deep coal mine. Chin J Rock Mechan Eng 29(10):1977–1987Google Scholar
  8. Pellet F, Egger P (1996) Analytical model for the mechanical behaviour of bolted rock joints subjected to shearing. Rock Mech Rock Eng 29(2):73–97CrossRefGoogle Scholar
  9. Su H, Bai J, Yan S, Chen Y, Zhang Z (2015) Study on gob-side entry retaining in fully-mechanized longwall with top-coal caving and its application. Int J Min Sci Technol 25(3):503–510. CrossRefGoogle Scholar
  10. Xie H, Zhou H, Liu J, Gao F, Zhang R, Xue D, Zhang Y (2011) Mining-induced mechanical behavior in coal seams under different mining layouts. J China Coal Soc 36(7):1067–1074Google Scholar
  11. Xue D, Zhou H, Tang X, Zhao Y (2013) Mechanism of deformation-induced damage and gas permeability enhancement of coal under typical mining layouts. Chin J Geotech Eng 35(2):328–336Google Scholar
  12. Zhang Z (2016) Investigation on stability mechanism and control techniques of immediate roof above backfill area in gob-side entry retaining. China University of Mining and Technology, XuzhouGoogle Scholar
  13. Zhang C, Zhao Q, Yu Y (2011) Dilation model of Heterogeneous rock affected by confiered pressure. J Min Saf Eng 28(3):436–440Google Scholar
  14. Zhang N, Yuan L, Han C, Xue J, Kan J (2012) Stability and deformation of surrounding rock in pillarless gob-side entry retaining. Saf Sci 50(4):593–599. CrossRefGoogle Scholar
  15. Zhang Y, Tang J, Xiao D, Sun L, Zhang W (2014) Spontaneous caving and gob-side entry retaining of thin seam with large inclined angle. Int J Min Sci Technol 24(4):441–445. CrossRefGoogle Scholar
  16. Zhang Z, Bai J, Chen Y, Yan S (2015) An innovative approach for gob-side entry retaining in highly gassy fully-mechanized longwall top-coal caving. Int J Rock Mech Min Sci 80:1–11. Google Scholar
  17. Zhao X, Cai M, Cai M, Jia P (2010) Mutual influence between shear dilatation of rock mass and rebar support around underground excavation. Chin J Rock Mechan Eng 29(10):2056–2062Google Scholar
  18. Zuo J, Liu L, Zhou H, Huang Y (2013) Deformation failure mechanism and analysis of rock under different mining condition. J China Coal Soc 38(8):1319–1324Google Scholar

Copyright information

© Springer International Publishing AG, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Work Safety Key Lab on Prevention and Control of Gas and Roof Disasters for Southern Coal Mines, Hunan Provincial Key Laboratory of Safe Mining Techniques of Coal MinesHunan University of Science and TechnologyXiangtanChina
  2. 2.Research Center of Coal Resources Safe Mining and Clean UtilizationLiaoning Technical UniversityFuxinChina

Personalised recommendations