Microscopic and Macroscopic Creep Damage Behavior and Constitutive Model of Sandstone Subjected to Static and Dynamic Coupled Loading
Publication: Journal of Engineering Mechanics
Volume 150, Issue 11
Abstract
Understanding the instantaneous and creep mechanical responses of rocks subjected to the combined influence of static and dynamic loading is of great importance for designing underground works. This study developed an impact-disturbance creep loading apparatus and conducted a series of multistage impact-disturbance creep experiments on sandstones, varying static creep loads, and dynamic disturbances. The investigation analyzed specimen deformation, acoustic emission (AE) signals, and nuclear magnetic resonance (NMR) porosity changes to determine creep characteristics from microscopic damage to macroscopic failure. The experiment revealed the profound influence of dynamic disturbances on sandstone’s instantaneous and creep behavior. Initially, these disturbances induce specimen densification under low creep stress but exacerbate damage propagation beyond a certain creep stress threshold. Moreover, increased dynamic disturbance energy correlates with higher creep failure strains but lower long-term specimen strengths. AE monitoring highlighted the role of dynamic disturbances in promoting tensile failure and the dominance of tensile cracks throughout the creep process. Notably, impact disturbances cause a significant increase in specimen porosity postcreep failure, especially in large pores. To capture sandstone creep behavior comprehensively under dynamic disturbance, a viscoplastic disturbance-damage creep model is proposed by integrating a disturbance-damage instantaneous element and dynamic-damage viscous element. The model can effectively describe sandstone creep behavior under dynamic disturbance conditions, offering valuable insights for underground work design.
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Data Availability Statement
All data and models generated during the study are available from the corresponding author upon request.
Acknowledgments
The research work was financially supported by the National Natural Science Foundation of China (Grant Nos. 52378410, U21A20153, and 42077246), the Knowledge Innovation Program of Wuhan-Shuguang Project (Grant No. 2023010201020246), and the Fundamental Research Funds for the Central Universities (Grant No. 2042023kf0165), for which the authors are grateful.
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Published In
Journal of Engineering Mechanics
Volume 150 • Issue 11 • November 2024
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© 2024 American Society of Civil Engineers.
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Received: Nov 4, 2023
Accepted: Jun 18, 2024
Published online: Aug 27, 2024
Published in print: Nov 1, 2024
Discussion open until: Jan 27, 2025
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