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Rock Mechanics and Rock Engineering

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26-09-2018 | Original Paper

Study on Damage and Repair Mechanical Characteristics of Rock Salt Under Uniaxial Compression

Authors: Hongwu Yin, Chunhe Yang, Hongling Ma, Xilin Shi, Xiangsheng Chen, Nan Zhang, Xinbo Ge, Wei Liu

Published in: Rock Mechanics and Rock Engineering | Issue 3/2019

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Abstract

Damage and self-healing characteristics of rock salt are key factors for the evaluation of underground salt cavern safety. During the construction of a salt cavern, characteristics of the surrounding rock (formation temperature, pressure and brine saturation) can affect the self-healing of rock salt. To study the recovery effect, we carried out a study through uniaxial compression tests. The rock salt samples were divided into group S and group X: samples in group X were annealed after initial damage (damage point: 15 Mpa, 20 Mpa, 25 Mpa and peak stress) while the samples in group S were not. For group S, a peak damage was applied immediately after the initial damage. Group X samples, after initial damage, were placed in the repair environment for 7 days. The repair environment mentioned above is set as saturated brine with a temperature of 50 °C and pressure of 12 MPa. It turned out that (1) the rock salt has almost no compaction phase during uniaxial compression. Damaged rock salt experienced an apparent compaction stage after being repaired; (2) for all the samples in the two groups, the yield stress and elastic modulus increase after the initial damage, which is regarded as the hardening of rock salt; (3) the plasticity of damaged rock salt can significantly recover after having been repaired. Thus, the environment during the construction of a salt cavern has a good effect on the self-healing of rock salt, and this characteristic of rock salt is beneficial to the safe operation of a cavern for storage purposes.

previous article On the Inelastic Mechanical Behavior of Granite: Study Based on Quasi-oedometric and Indentation Tests

next article Deformation and Damage Failure Behavior of Mudstone Specimens Under Single-Stage and Multi-stage Triaxial Compression

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Title: Study on Damage and Repair Mechanical Characteristics of Rock Salt Under Uniaxial Compression
Authors: Hongwu Yin
Chunhe Yang
Hongling Ma
Xilin Shi
Xiangsheng Chen
Nan Zhang
Xinbo Ge
Wei Liu
Publication date: 26-09-2018
Publisher: Springer Vienna
Published in: Rock Mechanics and Rock Engineering / Issue 3/2019
Print ISSN: 0723-2632
Electronic ISSN: 1434-453X
DOI: https://doi.org/10.1007/s00603-018-1604-0

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