NDLI: Study of the relationship between surface subsidence and internal pressure in salt caverns

Content Provider	Springer Nature Link
Author	Li, Mengyao Zhang, Haipeng Xing, Wei Hou, Zhengmeng Were, Patrick
Copyright Year	2015
Abstract	Because of the ultra-low permeability and favorable rheological properties of rock salt, salt caverns are globally considered to be an ideal medium for energy storage. The prediction and control of surface subsidence above storage caverns are the key problems that require steady attention to ensure their long-term safety and stable operation. For salt caverns already in existence factors such as depth, shape and geological conditions cannot be changed. Therefore, the operating condition (i.e., internal pressure) becomes a key factor in influencing surface subsidence. However, cyclic pressure change during the operation phase has not been seriously considered by analytical investigation yet. In this paper, theoretical models for the volume convergence rates in spherical and cylindrical caverns have been derived, thereby developing a new concept “equivalent internal pressure” that of rock salt is consideredalso takes cyclic internal pressure into consideration. The analytic solution for surface subsidence was then derived from a combination of transfer and distribution functions. Analytical and numerical solutions for different conditions were compared and verified, while the FDM code, FLAC3D, was used for numerical simulations. This comparison reveals that the use of “equivalent internal pressure” is suitable for predicting surface subsidence in the long-term cyclic operation conditions.
Starting Page	6899
Ending Page	6910
Page Count	12
File Format	PDF
ISSN	18666280
Journal	Environmental Earth Sciences
Volume Number	73
Issue Number	11
e-ISSN	18666299
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2015-04-18
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Salt storage cavern Equivalent internal pressure Surface subsidence Analytical solution Numerical solution Geology Hydrology/Water Resources Geochemistry Environmental Science and Engineering Terrestrial Pollution Biogeosciences
Content Type	Text
Resource Type	Article
Subject	Global and Planetary Change Earth-Surface Processes Soil Science Environmental Chemistry Pollution Geology Water Science and Technology

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