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Acoustic emission characteristics and energy evolution of salt rock for deep-salt-cavern engineering under triaxial loading and unloading

三轴加卸载条件下深部盐穴工程盐岩的声发射特征及能量演化

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Abstract

Deep salt cavern gas storage is subjected to periodic high stress load during operation. To explore the damage and deformation characteristics of salt rock under triaxial cyclic loading and unloading, the MTS815 rock mechanics test system and acoustic emission (AE) signal acquisition system were used, and the effects of confining pressure and loading and unloading on the characteristics of AE and energy evolution of the whole cycle were analyzed. The results showed that: 1) as the confining pressure increased from 10 MPa to 30 MPa, the cumulative AE counts in the compaction stage decreased by 86%. Kaiser effect was obvious before the peak stress point, and the Felicity ratio was negatively correlated with the number of cycles; 2) With the increase of deviatoric stress, the growth rate of elastic energy(Uc) and dissipated energy(Ud) increased gradually. Under the same deviatoric stress, the deformation and dissipation energy of high confining pressure specimen were smaller, when it reached the same stress; 3) Both Uc and Ud showed two-stage growth trend during the test. At the same strain level, with the increase of confining pressure Uc and Ud increased as MnMolecular function, when the confining pressure effect strengthened. Considering the confining pressure, the coupling equation of AE ringing count and Ud during loading and unloading was established and verified. It has certain guiding significance for the safe operation of deep salt cavern gas storage.

摘要

深部盐岩储气库在运行过程中受到周期性高应力载荷。为探索深部盐岩在三轴循环加卸载下的 损伤和变形特征, 采用MTS815 岩石力学测试系统和声发射(AE)信号采集系统, 分析了围压和加卸载 对盐岩声发射特征和能量演化的影响。结果表明: 1)当围压从10 MPa 增加到30 MPa 时, 压实阶段　 的累积声发射计数减少了86%。Kaiser 效应在峰值应力点之前明显, Felicity 比与循环次数呈负相关; 2)随着偏应力的增加, 弹性能(Ue)和耗散能(Ud)的增长率逐渐增加。在相同偏应力下, 高围压试样在达 到相同应力时的变形和耗散能越小;3)Ue和Ud在实验期间均呈现两阶段增长趋势;在相同应变水平 下, 随着围压的增加, Ue和Ud呈MnMolecular 函数增加, 且围压效应增强;在考虑围压的情况下, 建 立了加卸载过程中声发射计数与Ud的耦合方程。研究结果对深盐穴储气库的安全运行具有一定指导 意义。

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Authors and Affiliations

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

    Jing-jing Dai  (代晶晶), Jian-feng Liu  (刘建锋), Li-na Ran  (冉莉娜), Hao Lin  (林浩), Xin He  (何鑫) & Yu Bian  (边宇)

  2. CNPC Key Laboratory of Oil and Gas Underground Storage Engineering, Langfang, 065007, China

    Jian-feng Liu  (刘建锋) & Li-na Ran  (冉莉娜)

Authors
  1. Jing-jing Dai  (代晶晶)
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  5. Xin He  (何鑫)
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  6. Yu Bian  (边宇)
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Correspondence to Jian-feng Liu  (刘建锋).

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Contributors

DAI Jing-jing provided the concept and edited the draft of manuscript. LIU Jian-feng developed the overarching research goals and edited the draft of manuscript. RAN Li-na conducted the literature review. LIN Hao and HE Xin analyzed the calculated results. BIAN Yu provided the measured data, and analyzed the measured data.

Conflict of interest

DAI Jing-jing, LIU Jian-feng, RAN Li-na, LIN Hao, HE Xin, and BIAN Yu declare that they have no conflict of interest.

Foundation item

Projects(U20A20266, 51874202) supported by the National Natural Science Foundation of China; Projects (2022YFSY0007, 2021YFH0010) supported by the Scientific and Technological Research Projects in Sichuan Province, China

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Dai, Jj., Liu, Jf., Ran, Ln. et al. Acoustic emission characteristics and energy evolution of salt rock for deep-salt-cavern engineering under triaxial loading and unloading. J. Cent. South Univ. 30, 962–974 (2023). https://doi.org/10.1007/s11771-022-5213-4

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