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Studies on rock failure of layered rock in underground mining-face and control techniques

Original Article
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Abstract

The failure of layered rock in underground mining face may be influenced by the slipping among the layers. The shear failure around the excavation circular roadway is the main failure type in layered rock. To Study the rock failure in layered rock, the condition of bedding slipping in rock is analyzed, and the stresses distribution around circular roadway is calculated. Based on the analysis results, the Flac 3D software is used to analyze the failure of layered rock in roadway floor. Discontinuous interfaces are created to study the effect of bedding planes. The failure of floor is described at two phases: roadway stability phase and mining-face recovery influencing phase. The results indicate that a shear failure surface occurs at the side of coal pillar during the first phase; a shear arched plane occurs at the side of mining-face during the second phase. The results of numerical model are in good agreement with monitoring data. Finally, bolts reinforcement design is proposed to eliminate the development of failure zone in layered rock.

Keywords

Failure zone Roadway Layered rock Shear stress 

Abbreviations

\(\sigma_{r}\)

Radial stress in rock mass (MPa)

\(\sigma_{\theta }\)

Tangential stress in rock mass (MPa)

\(\sigma_{rp}\)

Radial stress of shear fracture zone

p0

Is the original rock stress (MPa)

\(\sigma_{\theta p}\)

Tangential stress of shear fracture zone (MPa)

\(\beta_{0}\)

Angle of bedding plane to the horizontal direction

\(\theta\)

Radial direction of RVE inclined to an angle \(\theta\) to the horizontal direction

p0

Original rock stress (MPa)

ra

Radius of the roadway (m)

r

Distance from the center of the roadway (m)

cj

Cohesion of bedding surface (MPa)

\(\varphi_{j}\)

Internal friction angle of bedding surface

rp

Distance from the boundary of the shear failure zone to the center of the roadway

Notes

Acknowledgements

The authors would like to acknowledge the financial supports of the State Key Research Development Program of China (No. 2016YFC0600708) and the China Scholarship Council (No. 201606430026). Special thanks go to two anonymous reviewers for their constructive comments to improve this work.

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Copyright information

© Springer International Publishing AG 2017

Authors and Affiliations

  1. 1.School of Resource and Safety EngineeringChina University of Mining and TechnologyBeijingChina
  2. 2.Deep Earth Energy Laboratory, Department of Civil EngineeringMonash UniversityMelbourneAustralia

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