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Experimental study on energy dissipation of fragments during rockburst

  • Zhiyong Chen
  • Guoshao SuEmail author
  • J. Woody JuEmail author
  • Jianqing Jiang
Original Paper
  • 23 Downloads

Abstract

In this study, rectangular prismatic coarse-grain granites were analyzed through an application of a modified true-triaxial rockburst testing system. Various loading rates were considered in a process in which one face was kept free and loading conducted on the other five faces. Using a proposed surface energy per unit area measurement method, the energy dissipation due to the formation of rock fragments during the rockburst process was quantitatively analyzed. The experimental results show that rockburst occurrence depends on several conditions, including — specifically the tangential loading rate exceeding a certain threshold, the presence of considerable amounts of stored strain energy, the dissipation of energy through rock splitting on the free face, and the shear failure in the potential rockburst pit. With increases in the loading rate from 0.5 to 4.0 MPa/s, the fragmentation and energy dissipation of fragments decline linearly. Lamellar coarse fragments are found to be primarily induced by tension failure from the rockburst pit surface. Blocky medium, fine fragments and white powdery tiny particles are mainly induced by shear failure from the rockburst pit interior. Under various loading rates, the dissipated energy of fragments induced by shear is more than 90% of the total dissipated energy.

Keywords

Rockburst Loading rate Fragments Energy dissipation True-triaxial test Granite 

Notes

Acknowledgments

The authors gratefully acknowledge financial support from the National Natural Science Foundation of China (No.51869003), the Guangxi Natural Science Foundation (No. 2016GXNSFGA380008), the Open Research Fund of State Key Laboratory of Geomechanics and Geotechnical Engineering (SKLGP2017K022), Institute of Rock and Soil Mechanics, Chinese Academy of Sciences (No. Z016009), Study Abroad Program for Excellent Ph.D. Students of Guangxi University, and Innovation Project of Guangxi Graduate Education (YCBZ2018024).

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Key Laboratory of Disaster Prevention and Structural Safety of China Ministry of Education, School of Civil and Architecture EngineeringGuangxi UniversityNanningChina
  2. 2.Department of Civil and Environmental EngineeringUniversity of CaliforniaLos AngelesUSA

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