Abstract
This paper examines viscosity of rock mass at different structural hierarchies. The study shows that viscosity and characteristic strain rate of rock mass vary at different structural levels. There exists one-to-one correspondence between characteristic scale level and strain rate. High viscosity with low characteristic strain rate occurs under macro-level, while meso- and micro-levels are characterized by low viscosity with high characteristic strain rate. Generally, with the increase in strain rate, deformation and fracture take place at decreasing scale levels, and viscosity gradually decreases. With high characteristic strain rate at meso- and micro-levels, viscosity is inversely proportional to strain rate at these levels. Based on the analysis on viscosity at different structural levels, a unified description of viscosity is suggested and applied to the description of the strength–strain rate sensitivity of rock mass.
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Acknowledgments
The study was financially supported in part by the National Natural Science Foundation of China (Nos. 51174012 and 51478027), the Project of Construction of Innovative Teams and Teacher Career Development for Universities and Colleges Under Beijing Municipality (No. IDHT20130512), the “973” Key State Research Program (Grant No. 2015CB0578005), Science Fund for Creative Research Groups of the National Natural Science Foundation of China (No. 51021001), as well as Development of High-Caliber Talents Project of Beijing Municipal Institutions granted to Dr. Jilin Qi (No. CIT&TCD20150101).
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Qi, C., Haoxiang, C., Bai, J. et al. Viscosity of rock mass at different structural levels. Acta Geotech. 12, 305–320 (2017). https://doi.org/10.1007/s11440-016-0449-5
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DOI: https://doi.org/10.1007/s11440-016-0449-5