Study of the Damage Evolution Process and Micromechanics Constitutive Model of Microcrystalline Limestone under Periodic Blasting Load
Publication: Journal of Materials in Civil Engineering
Volume 35, Issue 3
Abstract
The cumulative damage to rock and soil mass caused by blasting in tunnel, highway, hydropower, and other projects is very complex, but the process of damage evolution is still unclear. This study took Zhujiapo mining area limestone as the research object and analyzed the change in its strength and mechanical parameters with periodic blasting loads. Combined with damage mechanics theory and microcrack propagation zone theory, a micromechanics constitutive model considering cumulative damage evolution was developed. The results show that (1) periodic blasting loads have a continuous cumulative effect on microcrystalline limestone, the peak strength and elastic modulus of which decrease exponentially with increasing blasting cycles; (2) periodic blasting loads cause crystal fractures, microcrack initiation, and propagation; and (3) the micromechanics damage constitutive model considering confining pressure and periodic blasting loads well describes the micromechanics behavior of microcrystalline limestone in the Zhujiapo mining area. The research results provide a theoretical reference to the study of rock damage mechanical properties under periodic blasting loads.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
This work was supported by the Major Projects of the National Natural Science Foundation of China (Grant No. 42090051).
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Received: Dec 23, 2021
Accepted: Jul 6, 2022
Published online: Dec 28, 2022
Published in print: Mar 1, 2023
Discussion open until: May 28, 2023
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