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Geotechnical and Geological Engineering

, Volume 36, Issue 2, pp 1161–1173 | Cite as

Study on Coupling Support Technique in the Roadway of Hecaogou No. 2 Coal Mine with Soft Roadway of Large Deformation

  • Pengfei GuoEmail author
  • Manchao He
  • Jiong Wang
Original paper
  • 227 Downloads

Abstract

Through the study of failure mechanisms in soft roadways accompanying by large deformation, their failures are mainly induced by the uncoupling between mechanism of support and rock as well as their strength and rigidity. The deformation starts from key parts and later leads to unstability of the entire support system. Therefore, coupling surrounding rocks and corresponding support is indispensable in terms of the stability in soft roadways. It can be found from a great deal of research and engineering practice that coupling in rigidity between bolts and surrounding rock is able to reinforce rocks to the greatest extent. Coupling in strength, however, is more likely to make its stress field and displacement field evenly distribute. Also, when it comes to coupling in structure, the strength of the surrounding rock can be fully utilized to support roadways. On the basis of engineering surveys and corresponding rock mineral analysis in Hecaogou no. 2 coal mine, it can be found that the major factors causing great deformation in soft roadways are high degree of weathering, quality of surrounding rocks, water penetration and improper support scheme. The surrounding rock is categorized as jointed expandable composite soft rock. And later its deformation mechanism is determined as I AC II BC III CEA, which promotes the new design of net-anchor coupling support for roadway repair.

Keywords

Deformation mechanism Net-anchor coupling support Instability roadway Key technology of soft rock roadway 

Notes

Acknowledgements

The authors wish to acknowledge the funding support from Fund Project: Project supported by the National Key Research Development Program (Grant No. 2016YFC0600900) and the National Natural Science Foundation of China (Grant No. 41602308).

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Copyright information

© Springer International Publishing AG 2017

Authors and Affiliations

  1. 1.School of Civil Engineering of Shaoxing UniversityShaoxingChina
  2. 2.State Key Laboratory for GeoMechanics and Deep Underground EngineeringChina University of Mining and TechnologyBeijingChina
  3. 3.Institute of Mechanics and Architectural EngineeringChina University of Mining and TechnologyBeijingChina

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