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Rock Mechanics and Rock Engineering

, Volume 51, Issue 12, pp 3845–3852 | Cite as

Development of a Hollow Cylinder Torsional Apparatus for Rock

  • Hui Zhou
  • Yue Jiang
  • Jingjing Lu
  • Yang Gao
  • Jun Chen
Technical Note
  • 260 Downloads

Abstract

The mechanical characteristics of rock subjected to the changing of the principal stress magnitude and orientation caused by excavation are significant for the construction of larger and deeper underground engineering. However, there have been few experimental studies on rock mechanical characteristics under the changing principal stress orientation due to the lack of the test device. Hence, in this paper, a new rock mechanical experimental technique and device was developed to conduct the complex stress path with coupling variations of stress magnitude and orientation. The theoretical principle and apparatus composition were introduced in this work, and two test cases were conducted to verify its feasibility and reliability. This study has important practical significance and scientific value for promoting the technical level of rock mechanical test and enriching the theoretical frame of rock mechanics.

Keywords

Rock mechanical test Hollow cylinder torsional apparatus Complex stress path Principal stress axis rotation 

List of Symbols

F

Axial force

P1

Inner confining pressure

P2

Outer confining pressure

Mt

Torque

\({\sigma _{\text{z}}}\)

Axial stress

\({\sigma _{\text{r}}}\)

Radial stress

\({\sigma _\theta }\)

Circumferential stress

\({\tau _{{\text{z}}\theta }}\)

Shear stress

\({\sigma _1}\)

Maximum principal stress

\({\sigma _2}\)

Intermediate principal stress

\({\sigma _3}\)

Minimum principal stress

\(\alpha\)

Rotation angle of the \({\sigma _1}\) and \({\sigma _3}\) caused by Mt

L

Length of the torque arm

D

Diameter of the axial loading piston

R

Radius of the piston in the torque hydraulic jack

Notes

Acknowledgements

The authors would like to thank the financial supports provided by China National Key Basic Research Program under Grant no. 2014CB046902, the Scientific Instrument Developing Project of the Chinese Academy of Sciences (YZ201553), National Natural Science Foundation of China (NSFC) (51427803, 51404240, 51709257, and 51704097) and Youth Innovation Promotion Association CAS. Besides, the authors are also grateful to the anonymous reviewers for their careful reading of our manuscript and their many helpful comments.

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Copyright information

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

Authors and Affiliations

  • Hui Zhou
    • 1
    • 2
  • Yue Jiang
    • 1
    • 2
  • Jingjing Lu
    • 1
    • 2
  • Yang Gao
    • 1
    • 2
  • Jun Chen
    • 1
    • 2
  1. 1.State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhanChina
  2. 2.University of Chinese Academy of SciencesBeijingChina

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