Discussion on Determination Method of Long-Term Strength of Rock Salt

Guosheng Ding, Jianfeng Liu, Lu Wang, Zhide Wu and Zhiwei Zhou
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Guosheng Ding: Research Institute of Petroleum Exploration and Development, Langfang 065007, China
Jianfeng Liu: CNPC Key Laboratory of Oil and Gas Underground Storage Engineering, Langfang 065007, China
Lu Wang: State Key Laboratory of Hydraulic and Mountain River Engineering, College of Water Resource & and Hydropower, Sichuan University, Chengdu 610065, China
Zhide Wu: Research Institute of Petroleum Exploration and Development, Langfang 065007, China
Zhiwei Zhou: State Key Laboratory of Hydraulic and Mountain River Engineering, College of Water Resource & and Hydropower, Sichuan University, Chengdu 610065, China

Energies, 2020, vol. 13, issue 10, 1-12

Abstract: Due to the extremely low permeability and the excellent creep behavior, rock salt is the optimal surrounding rock of underground energy storage. The long-term safe operation of the rock salt energy storage is closely related to the creep behavior and long-term strength of rock salt, but few researches focus on the long-term strength of rock salt. In order to more accurately predict the long-term strength of rock salt, the isochronous stress–strain curve method and the volume expansion method for determining the long-term strength were analyzed and discussed based on axial compression tests and axial creep tests. The results show that the isochronous stress–strain curve method is intuitive but will greatly increase the test cost and test time to obtain a satisfactory result. The volume expansion method is simple, but the long-term strength obtained according to the inflection point of volumetric strain is much greater than the actual long-term strength of rock salt. Therefore, a new method applicable to rock salt was proposed based on the evolution of damage in rock salt in this paper, which takes the corresponding stress value at the damage initiation point as the long-term strength. The long-term strength determined by this method is consistent with that by the isochronous stress–strain curve method. The method is more economical and convenient and aims to provide a reference for the long-term stability study of underground salt caverns.

Keywords: rock salt; long-term strength; Isochronous Stress-Strain Curve Method; volumetric strain; damage initiation (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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