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Experimental Study on Damage Evolution Characteristics of Rock-Like Material

  • Research Article - Civil Engineering
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Abstract

Based on the continuum damage mechanics, the damage variable of wave velocity is defined, and the piecewise curve damage evolution of rock material constitutive model is constructed. Using uniaxial compression experiments, using ultrasound on the wave velocity in the process of compression test, the relationship between strain and velocity is obtained, and then the experimental parameters of constitutive model were analyzed. Analysis shows that: All specimens had similar damage variable strain curve, which is roughly “S” type. The damage variable-strain constitutive model based on the change of wave velocity is divided into four stages, which are brittle damage zone, damage transition zone, damage extension zone, and fracture failure zone. At the peak value, the damage variable with the increase in strain amplitude increased sharply and the initial crack width increased significantly, and the crack extension is very unstable. Then the damage fracture evolution characteristics of the specimen during loading are obtained.

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Acknowledgements

This study in the paper was funded by The National Natural Science Foundation of China (Nos. 11272185, 51678067 and 51378521), and Chongqing University Innovation Team (No. CXTDG201602012). The study was als financially supported by the Program (201309) for Par-Eu Scholars in Chongjing.

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Correspondence to Zhang Jinhao.

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Jinhao, Z., Hongkai, C., He, W. et al. Experimental Study on Damage Evolution Characteristics of Rock-Like Material. Arab J Sci Eng 44, 8503–8513 (2019). https://doi.org/10.1007/s13369-019-03864-0

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  • DOI: https://doi.org/10.1007/s13369-019-03864-0

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