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中南大学学报(英文版)

Journal of Central South University

Vol. 28    No. 6    June 2021

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Dynamic evolution of shear rate-dependent behavior of rock discontinuity under shearing condition
GU Lin-lin(顾琳琳)1, WANG Zhen(王振)2, 3, ZHANG Feng(张锋)4, GAO Fei(高飞)2, WANG Xiao(王晓)5

1. Department of Civil Engineering, Nanjing University of Science and Technology, Nanjing 210094, China;
2. School of Mechanical Engineering, Nanjing University of Science and Technology,
Nanjing 210094, China;
3. State Key Laboratory of Disaster Prevention and Mitigation of Explosion and Impact,
The Army Engineering University of PLA, Nanjing 210014, China;
4. Department of Civil Engineering, Nagoya Institute of Technology, Nagoya 4668555, Japan;
5. School of Civil Engineering, Southeast University, Nanjing 210096, China

Abstract:Rock blocks sliding along discontinuities can cause serious disasters, such as landslides, earthquakes, or rock bursts. The shear rate-dependent behavior is a typical time-dependent behavior of a rock discontinuity, and it is closely related to the stability of a rock block. To further study the shear rate-dependent behavior of rock discontinuities, shear tests with alternating shear rates (SASRs) were conducted on rock discontinuities with various surface morphologies. The dynamic evolution of the shear rate dependency was studied in detail based on the shear test results, and three stages were identified with respect to the shear stress and shear deformation states. The test results revealed that dynamic changes in shear stiffness and the energy storage abilities of the rock discontinuities occurred in relation to the shear rate-dependent behavior of crack growth, which increased with an increase in normal stress and/or the joint roughness coefficient. The stage of decreasing shear stiffness corresponded to a stage of noticeable shear rate-dependency, and the shear rate was found to have no influence on the initial crack stress.

 

Key words: shear rate-dependent behavior; rock discontinuity; dynamic evolution; initial crack stress

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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