Abstract
Using abandoned salt caverns for the disposal of solid wastes is one of the most effective and safest methods to deal with potential hazards caused both by the abandoned caverns and by the solid wastes. To investigate the geomechanical behavior of abandoned salt caverns used for solid waste disposal (alkali wastes), a discrete-continuous coupled method is proposed. In the proposed method, alkali wastes (discrete materials) are simulated using the discrete element method (DEM) while the caverns are simulated using the finite difference method (FDM). This method can overcome the shortcomings of the traditional method of treating the alkali waste as continuous materials with low strength, which cannot accurately depict the interaction between the cavern and alkali waste. Using the proposed method, a 3D geomechanical model is built to investigate the long-term mechanical behaviors of the cavern and alkali waste. The results show that the alkali wastes have significant effects on reducing the cavern convergence while the cavern convergence compacts the alkali wastes. Consequently, the surface subsidence induced by the convergence of the cavern is much smaller than that of a cavern which does not contain alkali wastes. This study provides a prerequisite to evaluate the effect of filling abandoned salt caverns filled with alkali wastes and also can serve as a reference for stability analysis of gas storage salt caverns that contain insolubles.
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Acknowledgments
The authors are sincerely grateful to Prof. Jaak J Daemen, Mackay School of Earth Sciences and Engineering, University of Nevada, for his thoughtful proofreading of this paper.
Funding
The research was supported by the National Natural Science Foundation of China (Nos. 51774266 and 51741410), National Natural Science Foundation of China Innovative Research Team (No. 51621006), Youth Innovation Promotion Association CAS (Grant No. 2019324), Natural Science Foundation for Innovation Group of Hubei Province, China (No. 2016CFA014), and National Key Research and Development Program of China (Nos. 2017YFC0804601 and 2018YFC0808403).
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Shi, X., Chen, Q., Ma, H. et al. Geomechanical investigation for abandoned salt caverns used for solid waste disposal. Bull Eng Geol Environ 80, 1205–1218 (2021). https://doi.org/10.1007/s10064-020-02013-4
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DOI: https://doi.org/10.1007/s10064-020-02013-4