Possible Stress Path of HCA for Cyclic Principal Stress Rotation under Constant Confining Pressures
Publication: International Journal of Geomechanics
Volume 7, Issue 6
Abstract
Nowadays most hollow cylinder apparatus (HCA) in the world can only apply two dynamic loads, namely the axial load and torque , during cyclic principal stress rotation. The limitation of this loading mode is presented, and based on such limitation other possible and applicable loading modes are put forward: (1) On the premise of setting a special constant related to the inner and outer cell pressure, the stress path at which shear stress regularly changes with rotation angle under the constant (Bishop parameter) and the constant mean principal stress can be achieved by adjusting ; (2) setting at a constant (not equal to 0.5), the linear relation between and can be realized under a regular changing . In this case and should satisfy a certain equation and meanwhile the peak value of should be restricted within the critical state line; (3) without regarding the effect of intermediate principal stress, a stress path of monotonously changing with can be achieved under constant . This implies that and should satisfy a combination of a number of simple trigonometric functions; and (4) the stress path of constant (with a random value between 0 and 0.5) and monotonous relation between and can be available under a regular changing . In realizing this stress path, and should satisfy certain equations and the maximum should also be restricted by the critical state line. Results of this research can not only validate possible stress paths in cyclic principal stress rotation tests but can also provide a basis for further HCA improvement.
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Acknowledgments
The writers thank Chris Wood for revisal working. Financial support for this research was provided by the National Natural Science Foundation of China, Grant No. NNSFC50308025.
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© 2007 ASCE.
History
Received: Jun 26, 2005
Accepted: Jul 11, 2006
Published online: Nov 1, 2007
Published in print: Nov 2007
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