Elastoplastic Coupling Solution of Circular Openings in Strain-Softening Rock Mass Considering Pressure-Dependent Effect
Publication: International Journal of Geomechanics
Volume 18, Issue 1
Abstract
Rock-like materials generally manifest both strain-softening and pressure-dependent effects. The critical plastic strain corresponding to the residual state also increases with the confining pressure. In this case, all of the mechanical property parameters are the functions of plastic strain and confining pressure. The elastoplastic coupling strain-softening model (EPCSS) is established by dividing the elastic and plastic surrounding rock of circular openings into m and n annuli, respectively. When the range of each annulus is significantly small, the surrounding rock can be considered as isotropic and uniform. Then, the elastoplastic coupling analytical solutions can be derived by representing the material properties of each annulus with the corresponding value at each annulus’s outer radius for both Mohr–Coulomb (M-C) and Hoek–Brown (H-B) rock masses, respectively. Based on the continuum conditions of adjacent annuli, the equations for determining the radius of each annulus were established. Finally, the solutions were validated by strain-softening rock mass, and examples of EPCSS rock mass were further studied.
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Acknowledgments
This project was supported by the National Natural Science Foundation of China (Grants 51204168, 41572263), National Basic Research 973 Program of China (Grant 2013CB036003), and China Postdoctoral Science Foundation (Grants 2013M531424, 2015M580493).
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Published In
International Journal of Geomechanics
Volume 18 • Issue 1 • January 2018
Copyright
© 2017 American Society of Civil Engineers.
History
Received: Jun 28, 2016
Accepted: Jul 31, 2017
Published online: Nov 7, 2017
Published in print: Jan 1, 2018
Discussion open until: Apr 7, 2018
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