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.
Abbreviations
- F :
-
Axial force
- P 1 :
-
Inner confining pressure
- P 2 :
-
Outer confining pressure
- M t :
-
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
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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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Zhou, H., Jiang, Y., Lu, J. et al. Development of a Hollow Cylinder Torsional Apparatus for Rock. Rock Mech Rock Eng 51, 3845–3852 (2018). https://doi.org/10.1007/s00603-018-1563-5
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DOI: https://doi.org/10.1007/s00603-018-1563-5