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| Analysis of damage evolution of rock salt under uniaxial compression in ultra-deep formation |
| YIN Hongwu1,2, ZHU Gengde3, ZHU Genggang4, GE Xinbo5
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1. Guangzhou Expressway Co., Ltd., Guangzhou 510555, Guangdong, China;
2. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, Hubei, China;
3. School of Civil Engineering and Architecture, Anhui University of Technology, Maanshan 243002, Anhui, China;
4. Yanzhou Public Works Section, China Railway Jinan Group Co., Ltd., Jining 272199, Shandong, China;
5. College of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao 266590, Shandong, China |
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Abstract To address the damage evolution of rock salt in Qianjiang, uniaxial compression tests were carried out by using the MTS815 rock mechanics test system. The specimens were collected from the target formation. The results showed that there was no obvious compaction stage in the uniaxial compression of rock salt. The stress-strain curve could be divided into three stages: initial non-damage elastic stage(very short); plastic platform stage, where the damage accumulated rapidly(very long); failure stage, where damage continued to develop. Based on the deformation and failure process of rock salt under uniaxial compression, a mathematical model of damage evolution was established. The reliability of the model was verified by the experiment, which could well reflect the stress-strain process and the damage evolution of ultra-deep rock salt in Qianjiang. In view of the splitting failure of the ultra-deep rock salt under uniaxial compression, the mechanical explanation was given. The research results have a certain guiding significance for the construction of underground salt cavern gas storage.
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Received: 09 June 2021
Published: 20 December 2021
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