Effects of Differences in Mechanical Parameters of Media on Mechanical Properties and Failure Form of Composite Samples
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The deformation and failure of composite rock masses at the contact zone can cause serious safety hazards in underground engineering. Therefore, uniaxial compression experiment and numerical studies of composite samples were conducted. Combined with theoretical analysis, the effects of differences in the mechanical properties of two media on the mechanical properties and failure form of composite samples were investigated. The results show that the difference in mechanical properties of two media weakened the strength and elastic modulus of the composite sample and resulted in complex failure form of the sample. Additionally, the peaks of the AE frequencies of the two media occurred successively after the peak stress of the sample. At the macrolevel, the two media failed successively. These effects are more pronounced as the degree of difference in the mechanical properties of the two media increased. The difference in mechanical properties of the two media resulted in uncoordinated deformation and constrained stress near the contact interface, and the difference in Poisson’s ratio is the main factor. The influence (enhanced or weakened) of uncoordinated deformation on the mechanical properties of the composite sample is affected by differences in the elastic modulus and Poisson’s ratios of the two media.
KeywordsComposite sample Difference in mechanical properties Uncoordinated deformation Constrained stress Acoustic emission
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This work was funded by the National Natural Science Foundation of China (No. 51574183, No. 51704213), Natural Science Foundation of Hubei Province (No. 2017CFC831) and the Wuhan University of Science and Technology 2018 Innovation Fund (No. JCX201855). We also express our gratitude to the members of the Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, for their help with the experiments.
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