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Damage evolution of rock salt under cyclic loading in unixial tests

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Abstract

Cyclic loading tests of rock salt were performed to investigate the characteristics of damage evolution of the surrounding rock in gas caverns. In this experiment, the cyclic loading process was carried out on seven stress levels from 20 to 86 % of the uniaxial compressive strength. The sine wave with a frequency of 1 Hz was adopted in the cyclic loading test. Experimental results show that at the first stress level, the damage evolution is rather limited or negligible under cyclic loading, which is controlled within the elastic limit. With the increase in stress level, the damage evolution becomes more evident. An increasing tendency of damage variable can be observed if the stress level surpasses 40 % of the uniaxial compressive strength. A maximum damage value of around 0.95 is recorded when the stress level is over 85 % of the uniaxial strength. In this paper, a damage evolution equation is also introduced and good agreement is obtained with the experimental data. Based on the experimental data, it is shown that the design practice of gas cavern concerning the degree of strength utilization of the surrounding rock is rather conservative considering the reducing effect of the minimal gas pressure on the damage evolution.

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Acknowledgments

The authors are grateful for the financial support from the National Natural Science Foundation of China (Grant No. 51120145001, 51104101, 51134018), the National Basic Research Projects of China (Grant No. 2011CB201201, 2010CB226802, 2010CB732005), State Key Laboratory of Geohazard Prevention and Geoenvironment Protection (Grant No. SKLGP2013K016). The authors wish to offer their gratitude and regards to the colleagues who contributed to this work.

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Authors and Affiliations

  1. State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu, 610065, China

    Jianfeng Liu & Heping Xie

  2. State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu, 610059, China

    Jianfeng Liu

  3. Key Laboratory of Energy Engineering, Safety and Mechanics on Disasters, Sichuan University, Ministry of Education, Chengdu, 610065, China

    Jianfeng Liu & Heping Xie

  4. Institute of Petroleum Engineering, Clausthal University of Technology, 38678, Clausthal-Zellerfeld, Germany

    Zhengmeng Hou

  5. Sino-German Energy Research Center, Sichuan University, Chengdu, 610065, China

    Zhengmeng Hou

  6. Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, 430071, China

    Chunhe Yang

  7. Beijing Research Institute of Uranium Geology, Beijing, 100029, China

    Liang Chen

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  1. Jianfeng Liu
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  2. Heping Xie
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  3. Zhengmeng Hou
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Correspondence to Jianfeng Liu.

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Liu, J., Xie, H., Hou, Z. et al. Damage evolution of rock salt under cyclic loading in unixial tests. Acta Geotech. 9, 153–160 (2014). https://doi.org/10.1007/s11440-013-0236-5

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  • DOI: https://doi.org/10.1007/s11440-013-0236-5

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