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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 Zhang
  • Weijun Wang
  • Shuqing Li
  • Xianyang Yu
Original paper
  • 116 Downloads

Abstract

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.

Keywords

Gob-side entry retaining Rockbolt support Dilatancy Roadside backfill area 

Notes

Acknowledgements

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).

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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

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