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Mechanical Behavior of a Granite from Wuyi Mountain: Insights from Strain-Based Approaches

  • Liangfeng Xiong
  • Shunchuan Wu
  • Shihuai Zhang
Original Paper

Abstract

A series of monotonic and cyclic loading tests were conducted on granite samples from Wuyi Mountain to investigate the mechanical behavior under different confinements and damage states. The irreversible axial and radial strains were computed to characterize the development of the damage state, and three characteristic stages were detected according to the average gain rate. The evolution of the apparent deformation parameters with the deviator stress level was investigated to determine the linear elastic stage, but no substantial progress was achieved. In addition, two typical approaches (transitional region and same gradient region of hysteresis) were also found to be unsuitable for determining the elastic parameters to complete the cyclic loading test. Therefore, a secant approach was proposed based on volumetric strain to identify the lower bound of the nominal linear elastic stage with the upper bound established by linear regression. The results indicated that both elastic parameters and stress thresholds showed positive correlations with confinement. With the accumulation of the damage state, the peak stress and crack initiation threshold decreased, crack damage threshold and elastic parameters first increased and then decreased, and the crack closure threshold showed a tendency to decrease–increase–decrease. In addition, the strain softening stage showed a higher slope and minor stress drop value under larger confinement, and a transition from plastic compaction to plastic dilatancy was also detected.

Keywords

Damage Confinement Deformation Strength Monotonic loading Cyclic loading 

Notes

Acknowledgements

The constructive comments from the editor, associate editor and anonymous reviewers are gratefully acknowledged. The authors would like to thank Dong Zhang, Zhengjun Huang and Lei Zhang for their technical support during the laboratory experiments and Kai Cui and Yuling Xie for helpful comments on the petrographic analysis. This work was supported by the National Natural Science Foundation of China (Grant number 51774020) and the Beijing Training Project for the Leading Talent in S & T (Grant number Z151100000315014).

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Copyright information

© Springer-Verlag GmbH Austria, part of Springer Nature 2018

Authors and Affiliations

  1. 1.State Key Laboratory of High-Efficient Mining and Safety of Metal Mines (University of Science and Technology Beijing)Ministry of EducationBeijingChina
  2. 2.Faculty of Land Resources EngineeringKunming University of Science and TechnologyKunmingChina

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