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Study on the mechanical properties of man-made salt rock samples with impurities
Gas Science and Engineering ( IF 5.285 ) Pub Date : 2020-12-01 , DOI: 10.1016/j.jngse.2020.103683 Wei Liu , Xiong Zhang , Jinyang Fan , Jiangjiang Zuo , Zhixin Zhang , Jie Chen
Gas Science and Engineering ( IF 5.285 ) Pub Date : 2020-12-01 , DOI: 10.1016/j.jngse.2020.103683 Wei Liu , Xiong Zhang , Jinyang Fan , Jiangjiang Zuo , Zhixin Zhang , Jie Chen
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Abstract The salt rock formations in China all contain a certain amount of impurities. It is necessary to study the mechanical performances of salt rock that contains impurities. However, to obtain the salt rock samples that have different types and contents of impurities is difficult. Therefore, man-made salt rock samples containing impurities (sodium sulfate salt rock-SSR and gypsum salt rock-GSR) were prepared to replace the natural salt rock for study. The results show that the density of man-made salt rock was slightly lower than natural ones. And the compactness of SSR samples was suitable while GSR samples were differed slightly, which might be related to the particle size and water absorption of the impurities. Laboratory compression tests were conducted to investigate the influence of impurities on the mechanical performances of the salt rock. The strengths of both SSR and GSR samples decreased with the increase in impurity content. The peak strength of the SSR samples fell straightly, while that of the GSR samples show a parabola-like dropping trend. The elastic modulus of SSR samples beavered enhanced effect and was increased with the increasing content of impurity. And the elastic modulus of GSR samples behaved a parabola-trend decreasing with the impurity content increased. On the evaluation of brittleness characteristics, when the impurity content was at a low level, it had almost no significant effect on the sample's whole ductility. Only at the higher impurity content, the brittleness was increased dramatically, resulting in a rapid rupture of the sample after the peak strength. At last, some discussions about the geological properties of salt mine pointed out the direction of future research. This study revealed the influence of impurities on the mechanical characteristics of salt rocks and could provide a reference for the stability evaluation of natural gas storage caverns in salt formations.
更新日期：2020-12-01
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