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Experimental and numerical analyses on the effect of stiffness on bedded sandstone strain burst with varying dip angle

  • Manchao He
  • Fuqiang RenEmail author
  • Cheng Cheng
Original Paper
  • 321 Downloads

Abstract

Strain burst violence is related to the stiffness ratio (SR) between environmental and bursting rock masses. Strain burst tests on dolomite specimens with different system stiffnesses and bedded sandstone with four different dip angles as well as numerical analyses of strain burst with different structures are carried out to study the effect of stiffness on strain burst. Results indicate that strain burst intensity is larger in a more flexible system environment, and lower SR corresponds to a larger probability of strain burst. Additionally, with increasing SR, the failure mode becomes more stable, and the influence of the structures on failure mode vanishes gradually. For the lowest SR, the strain energy densities (SEDs) from the surrounding rock are lower for steep structures, while flatter structures correspond to higher SED. Moreover, for vertical and horizontal structures, variation in SED with SR is more sensitive; however, for steep and medium discontinuities, the sensitivity is lower.

Keywords

Strain burst SR Structural plane Experimental tests Numerical analysis SED 

Notes

Acknowledgements

Financial support from the National Key Research and Development Program grant no. 2016YFC0600901 is gratefully acknowledged.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.State Key Laboratory for Geomechanics & Deep Underground EngineeringBeijingChina
  2. 2.School of Mechanics and Civil EngineeringChina University of Mining & TechnologyBeijingChina
  3. 3.Institute of Geology and Geophysics Chinese Academy of ScienceBeijingChina

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