Tensile failure and acoustic emission characteristics of rock salt under different tensile testing conditions

Abstract

The tensile strength of rock salt is an important parameter in the salt cavern gas storage project. Due to the high requirements for experimental setup and rock specimens in the direct tensile test, it is necessary to find another alternative to obtain the tensile strength. Therefore, the tensile strength and acoustic emission (AE) characteristics obtained by the direct tensile test, Brazilian test with simplified ISRM standard, Brazilian test with China standard, and three-point-bending test were discussed in this paper. It is noticed that the tensile testing method has an effect on the tensile strength of rock salt and the AE counts, energy and spatial distribution. Based on the tensile strength determined by three-point-bending test and the AE evolution characteristics, the indirect tensile strength determined by three-point-bending test was much closer to the tensile strength determined by direct tensile test, meaning that the three-point-bending test could be considered as a good option to obtain the tensile strength of rock salt except direct tensile test.

Keywords

rock salt / tensile strength / acoustic emission / damage evolution

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