Influence of Complex Stress Path on Energy Characteristics of Sandstones under Triaxial Cyclic Unloading Conditions
Publication: International Journal of Geomechanics
Volume 22, Issue 6
Abstract
This paper explores the characteristics of energy accumulation, evolution, and dissipation of sandstone samples under different confining pressure conditions in the triaxial cyclic unloading test. The characteristics of the stress–strain relationship of deformation and failure of rock samples are analyzed in detail. By utilizing the integral method for the area, the densities of total energy, elastic energy, and dissipated energy under different confining pressure are calculated. In addition, the energy evolution laws of rock deformation and failure with cyclic unloading times are researched. The results demonstrate that during the unloading cycle of confining pressure, the total energy density u, elastic energy density ue, axial total energy density u1, and axial elastic energy density ue1 increase, the radial total energy density u3 and the radial elastic energy density ue3 decrease, and the dissipated energy density is almost unchanged. The total energy density u and elastic energy density ue of rock under different confining pressure cycle unloading have a significant linear relationship. Meanwhile, the scanning electron microscope image shows the microstructure characteristics of the cracks in the sandstone samples. The image results are consistent with the analysis of the macroscopic failure characteristics. Under the same stress path, the higher the initial confining pressure, the more severe the failure of the rock sample. The experimental results are expected to enhance the basic research on the energy characteristics under the triaxial unloading behavior of rock.
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Acknowledgments
This work was supported by the National Natural Science Foundation of China (Grant Nos. 52164001, 52064006, and 52004072), Science and Technology Support Project of Guizhou (Grant Nos. [2020]4Y044), [2021]N404, and [2021]N511), Talents of Guizhou University (Grant No. 201901), the Special Research Funds of Guizhou University (Grant Nos. 201903, 202011, and 202012), Guizhou University Cultivation Program ([2020] No. 1), and Higher Education research project of Guizhou University (Project No. GDGJYJ2021009).
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Published In
International Journal of Geomechanics
Volume 22 • Issue 6 • June 2022
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© 2022 American Society of Civil Engineers.
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Received: Nov 1, 2020
Accepted: Feb 7, 2022
Published online: Apr 6, 2022
Published in print: Jun 1, 2022
Discussion open until: Sep 6, 2022
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