Experimental Investigation on Anisotropic Strength and Deformation Behaviors of Columnar Jointed Rock Mass in Confined State
Publication: International Journal of Geomechanics
Volume 21, Issue 9
Abstract
Columnar jointed rock mass (CJRM) has a special joint structure formed during the cooling of lava. The self-oriented joint structure can induce mechanical anisotropy of the rock mass, which poses a challenge for geotechnical engineering. To understand the mechanical properties of CJRM, conventional triaxial compression tests were conducted on the artificial CJRM specimens. It can be found from the experiment results that the orientation of columns has a distinct impact on the strength and deformation modulus. Four failure modes of CJRM specimens at different dip angles of columns under different confining pressures can be observed. The anisotropy degree in strength and deformation modulus is estimated, where it is found that the increase of confining pressure decreases the anisotropy in strength and increases the anisotropy in deformation modulus.
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Acknowledgments
The laboratory equipment and technical support provided by Professor Weiya Xu in the Hohai University are appreciated. The financial support provided by the China Postdoctoral Science Foundation (Grant No. 2019M661711) and the Fundamental Research Funds for the Central Universities (Grant No. B200202083) is also appreciated.
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Published In
International Journal of Geomechanics
Volume 21 • Issue 9 • September 2021
Copyright
© 2021 American Society of Civil Engineers.
History
Received: Oct 21, 2020
Accepted: May 9, 2021
Published online: Jun 30, 2021
Published in print: Sep 1, 2021
Discussion open until: Nov 30, 2021
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