Abstract
Constructing salt cavern gas storage in the ultra-deep strata more than 2000 m in depth is an important strategic technologic development in China. A primary issue is that higher temperature affects the creep behaviors of the surrounding rock. In this paper, triaxial creep tests of rock salt under multi-stage temperatures were carried out to study the influence of temperature on the creep behaviors of rock salt. Synchronous acoustic emission monitoring was performed throughout the creep test to study the microcracks characteristics of rock salt during creep at different temperatures. The results show that the duration of transient creep decreases with the increase of temperature. The steady-state creep rate increases with the increase of temperature. Temperature rise prompts the creep of rock salt to enter the volume dilatation stage. By analyzing the acoustic emission energy/counts, it is found that the microcracks generated during the creep at high temperature are few, but there are more at low temperature. Microcracks are generated intensively during rising temperatures. By analyzing the characteristics of the acoustic emission spectrum, it is found that when the temperature is low, the cracks generated are mainly intergranular cracks with a larger size, and they are mainly intragranular cracks with a smaller size when the temperature is high. The research in this paper is helpful to further understand the creep properties of ultra-deep rock salt and provides an important basis for the design, construction, and operation of gas storage salt caverns.
Highlights
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The influence of temperature on the creep of rock salt was studied by performing multistage temperature creep tests.
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The microcracks characteristics of rock salt during creep at different temperatures were studied using acoustic emission technology.
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The duration of transient creep phase decreases with the increase of temperature.
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The steady-state creep rate increases exponentially with the increase of temperature.
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The data that support the findings of this study can be available from the corresponding author upon reasonable request.
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Acknowledgements
The authors wish to acknowledge the Excellent Young Scientists Fund Program of National Natural Science Foundation of China (No. 52122403), the General Program of National Natural Science Foundation of China (Nos. 51874273; 51874274), Youth Innovation Promotion Association CAS (No. 2019324), Project for Introducing Overseas Scholars of Hebei Province (C20210304), the Hebei Province Key Research and Development Program of China (No. 21374101D), National Natural Science Foundation of China (Grant No. 52208342). The authors are sincerely grateful to Professor J. J. K. Daemen (Mackay School of Earth Sciences and Engineering, University of Nevada, USA) for his linguistic assistance during the preparation of this manuscript.
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Dong, Z., Li, Y., Li, H. et al. Experimental Study on the Influence of Temperature on Rock Salt Creep. Rock Mech Rock Eng 56, 3499–3518 (2023). https://doi.org/10.1007/s00603-023-03219-0
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DOI: https://doi.org/10.1007/s00603-023-03219-0