The creep-damage model of salt rock based on fractional derivative

Zhou, H●Liu, D●Lei, G●Xue, D●Zhao, Y

Abstract

The use of salt  rock for underground radioactive waste disposal facilities requires acomprehensive analysis of the creep-damage process in salt rock. A computer-controlled creep setupwas employed to carry out a creep test of salt rock that lasted as long as 359 days under a constant uniaxial stress. The acoustic emission (AE) space-time evolution and energy-releasing characteristics during the creep test were studied in the meantime. A new creep-damage model is proposed on thebasis of a fractional derivative by combining the AE statistical regularity. It indicates that the AE datain the non-decay creep process of salt rock can be divided into three stages. Furthermore, the authors propose a new creep-damage model of salt rock based on a fractional derivative. The parameters in the model were determined by the Quasi-Newton method. The fitting analysis suggests that the newcreep-damage model provides a precise description of full creep regions in salt rock.

Keywords

salt rock; creep; damage; fractional derivative; acoustic emission

引用格式：

Zhou, H., Liu, D., Lei, G., Xue, D., Zhao, Y. (2018). The creep-damage model of salt rock based on fractional derivative. Energies, 11(9):1-9

DOI:doi:10.3390/en11092347

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