Rock Mechanics and Rock Engineering

, Volume 52, Issue 10, pp 4101–4112 | Cite as

Mechanical Properties of Basalt Specimens Under Combined Compression and Shear Loading at Low Strain Rates

  • Qingyuan He
  • Yingchun LiEmail author
  • Sa She
Technical Note


Previous studies on pillar stability focus on estimation of pillar strength and evaluation of pillar burst proneness. Pillar axes were commonly assumed parallel to the vertical in situ principal stress direction (Zhang et al. 2016). In this ideal situation, pillars are under pure compressive loading. This deviates from the real situation that mining pillars are often loaded in combined compression and shear, such as the loading conditions of inclined pillars in coal mining (Wei 2014). Pariseau ( 1982) sheds light on the importance of the dip angle of a flat, tabular orebody on pillar strength and proposed a factor of safety formula considering pillar shear strength as well as shear loading. Foroughi and Vutukuri ( 1997) realized that the existence of shear loading complicates estimation of pillar stability in inclined coal seams. Suorineni et al. ( 2011) identified the oblique loading of the maximum in situ principal stress on orebodies as a cause of rock bursts. The...


Pillar stability Specimen inclination Inclined UCS test Combined compression and shear loading 

List of symbols


Axial stress applied to the specimen in the conventional UCS test (MPa)


Maximum in situ principal stress (MPa)


Axial stress applied to the specimen in the inclined UCS test (MPa)


Specimen axial strain in the conventional UCS test, 1


Specimen axial strain in the inclined UCS test, 1


Specimen inclination angle (°)


Initial specimen cross-section area (m2)


Displacement between two platens of the MTS (m)


Loading force applied perpendicular to the specimen surface (N)


Initial specimen length (m)


Distance between two platens of the MTS before the inclined UCS test (m)


Distance between two platens of the MTS after the inclined UCS test (m)


Coefficient of determination, 1



Combined compression and shear test


Material testing system


Split Hopkinson pressure bar


Uniaxial compressive strength



The work of this paper is financially supported by the Jiangsu Province Science Foundation for Youths (Grant number: BK20180658), State Key Laboratory of Coal Resources and Safe Mining (Grant number: SKLCRSM18X009), and China Postdoctoral Science Foundation (Grant number: 2018M632422). The authors would like to acknowledge Professor Fidelis Suorineni for his contribution to developing the C-CAST system and Professor Herbert Einstein for his constructive comments and suggestions that substantially improve the quality of the manuscript.


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Copyright information

© Springer-Verlag GmbH Austria, part of Springer Nature 2019

Authors and Affiliations

  1. 1.State Key Laboratory of Coal Resources and Safe Mining, School of MinesChina University of Mining and TechnologyXuzhouChina
  2. 2.State Key Laboratory of Coastal and Offshore EngineeringDalian University of TechnologyDalianChina
  3. 3.School of Minerals and Energy Resources EngineeringUNSW SydneySydneyAustralia

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