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Influence of loading rate on strainburst: an experimental study

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Abstract

Rockburst is a geological disaster in highly stressed ground. As a typical rockburst, strainburst is an ejection failure phenomenon caused by tangential stress concentration, which is frequently encountered in hard-brittle intact rocks in deep tunnel excavation. To explore the strainburst characteristics, a set of tests on rectangular prismatic granite specimens with different loading rates were conducted using an improved true-triaxial testing machine. During the testing process, a special loading path, namely, keeping one free face and loading on other faces, was adopted to simulate the stress concentration of surrounding rock masses near the opening. High-speed cameras were used to record the failure process on the free face of tested specimens. The speed and the kinetic energy of ejected fragments during strainburst were obtained by analyzing videos recorded using high-speed cameras. The experimental results reveal that the loading rate (simulating the rate of tangential stress concentration) plays an important role with respect to the strainburst characteristics. As the loading rate increases from 0.05 to 5.0 MPa/s, the failure mode of tested specimens transfers from static failure (spalling) to dynamic failure (strainburst), and the kinetic energy of ejected fragments during strainburst, as well as the rock strength, increases.

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Acknowledgements

The authors would like to thank the National Natural Science Foundation of China (Grant No. 41472329) for support. The work in this paper was also supported by the Open Research Fund of State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences (Grant No. Z016009), Guangxi Natural Science Foundation (Grant No. 2016GXNSFGA380008) and the Study Abroad Program for Excellent Ph.D. Students of Guangxi Zhuang Autonomous Region of China.

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Correspondence to Jianqing Jiang.

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Su, G., Jiang, J., Feng, X. et al. Influence of loading rate on strainburst: an experimental study. Bull Eng Geol Environ 78, 3559–3573 (2019). https://doi.org/10.1007/s10064-018-1351-1

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