Orthotropic Elastic Model and Its Parameters in Anchored Layered Rock Mass under Varying Incident Angles: Development and Validation
Publication: International Journal of Geomechanics
Volume 23, Issue 5
Abstract
Rock bolting is one of the most effective and economical methods for jointed rock mass reinforcement. Therefore, the elastic constitutive relationship in an anchored rock mass, which could well reflect the rules of strength and deformation, should be studied. An orthotropic elastic model, which considered varying anchorage angles (α) and the corresponding mechanical parameters, was investigated based on the theory of mechanics of composite materials. To verify the suitability of the model and the mechanical parameters, a WAW-3,000 kN servo universal hydraulic testing machine was used to undertake a series of uniaxial compression tests on the anchored layered rock specimens. The mechanical parameters of composite specimens, such as elastic modulus (E), Poisson’s ratio (ν), peak strength, and its variation with α were obtained. The results showed that the anchored effect of a bolt on the layered rock mass was very significant and anisotropic, for instance, increments in the elastic parameters in three orthogonal directions were quite different with the increase in α from 0° to 90°, which mainly depended on the relative volume content of the component materials in a certain direction. Comparing the calculated E with the experimental values, the variation rules for the mechanical parameters maintained good consistency, and this proved that the calculated equations in this work were reasonable and had acceptable precision. The spillway slope of a reservoir was simplified and simulated and the optimal α was obtained, which further demonstrated the reasonability and applicability of the proposed model from the viewpoint of engineering practice.
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Acknowledgments
This research was financially supported by the National Natural Science Foundation Project of China (No. 42167025), Major Science and Technology Special Project of Guizhou Province, China (No. [2018]3011), Science and Technology Foundation Project of Guizhou Province, China (No. [2020]1Z052, [2020]1Y185). They are gratefully acknowledged.
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Published In
International Journal of Geomechanics
Volume 23 • Issue 5 • May 2023
Copyright
© 2023 American Society of Civil Engineers.
History
Received: May 23, 2022
Accepted: Nov 20, 2022
Published online: Mar 10, 2023
Published in print: May 1, 2023
Discussion open until: Aug 10, 2023
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