Biaxial Creep Test Study on the Influence of Structural Anisotropy on Rheological Behavior of Hard Rock
Publication: Journal of Materials in Civil Engineering
Volume 28, Issue 10
Abstract
Rheological characteristics are one of most important properties needed to be considered in the design and construction for the long-term stability and serviceability of underground structures in the rock mass. To date, although extensive studies on the rheological properties of rocks are available in the literature, most of the existing studies reported the strain-time data for the axial deformation through the compression rheological method and did not mention the lateral deformation, and mainly focused on the soft rocks at shallow depth. Thus, very limited attention has been paid to the rheological properties of deep and hard rock, neglecting the effects of structural anisotropy on the rheological properties. This paper presents a comprehensive, in-depth study of the rheological behaviors of super-deep hard rock, considering the effects of structural anisotropy by using the uniaxial and biaxial creep tests. The results revealed that significant creep behavior can be observed in the hard rock specimens under high stress in the in situ conditions, and the strain-time behavior of hard rock exhibited brittle failure. The strain-time curves of hard rock exhibited two obvious phases of instantaneous creep and steady-state creep, without the phase of accelerated creep. Moreover, it was observed that the rheological behaviors, including the instantaneous modulus, transient creep duration, axial and lateral creep deformations, steady-state creep rate, volumetric strain, and contraction ratio are strongly affected by the structural anisotropy. Based on the experimental data, empirical models of the parameters governing creep behavior have been established.
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Acknowledgments
This work was financially supported by National Natural Science Foundation of China (Grant No. 51178420; 51509219).
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Published In
Journal of Materials in Civil Engineering
Volume 28 • Issue 10 • October 2016
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© 2016 American Society of Civil Engineers.
History
Received: Jul 8, 2015
Accepted: Dec 15, 2015
Published online: May 9, 2016
Published in print: Oct 1, 2016
Discussion open until: Oct 9, 2016
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