Empirical analysis of unloading creep damage mechanism of salt rock at 110 °C
文献类型：期刊论文
| 作者 | Li, Haoran2,3; Wei, Qun2,4; Xu, Zhuang2,4; Zhuo, Cuiyao2,3; Dong, Zhikai2,3; Zhao, Weigang2,3; Shi, Xilin1 |
| 刊名 | ENERGY
 |
| 出版日期 | 2024-05-01 |
| 卷号 | 294页码:12 |
| 关键词 | High-temperature unloading test Steady-state creep rate Peak frequency B-value Moment tensor inversion |
| ISSN号 | 0360-5442 |
| DOI | 10.1016/j.energy.2024.130908 |
| 英文摘要 | Underground energy storage in salt caverns involves operating in high -temperature conditions within deep strata, leading to unloading creep in the surrounding salt rock during cavity construction and natural gas extraction. Therefore, understanding the deformation and damage evolution of salt rock in such conditions is vital for ensuring safe construction and prolonged operation of deep salt cavern gas storage. The present study involves graded unloading creep tests and synchronous acoustic emission tests on the salt rock at 110 degrees C. The moment tensor inversion theory is employed to analyze focal mechanisms and microscopic crack propagation modes based on the test results. The findings reveal that under constant deviatoric stress, decreasing confining pressure exponentially increases the duration of the deceleration creep stage in salt rock. The creep increment and axial steady-state creep rate exhibited a U -shape trend. Instantaneous strain during stress change mainly involves elastic -plastic strain, where the instantaneous strain decreases first and then increases, exhibiting hardening characteristics in the middle process. The evolution of microcracks in salt rock can be categorized into three stages: compaction stage, stable propagation stage, and accelerated propagation stage. The acoustic emission energy, b -value, and fractal dimension of each stage are different. In unloading creep tests, the peak frequency in acoustic emission signal presents zonal distribution in low -frequency and high -frequency regions. It is found that as the confining pressure decreases, the peak frequency of acoustic emission signal and the proportion of high -frequency signal decrease, and the b -value and fractal dimension exhibit an upward -fluctuationdownward trend. The rupture slip angle of the acoustic emission source can effectively characterize the creep slip behavior in salt rock crystals. The slip gradually shifts from vertical to horizontal, while the strike angle and dip angle of rupture orientation are minimally affected by unloading. The obtained results can provide a reference for the safe construction and the design of the operation pressure for ultra -deep salt cavern gas storage. |
| 资助项目 | National Natural Science Foundation of China[U2034207] ; Natural Science Foundation of Hebei Province[E2021210099] ; Scientific and Technological Research Foundation for the Selected Returned Overseas Chinese Scholars[C20210304] ; Postgraduate Innovation Funding Proj- ect of Shijiazhuang Tiedao University[YC202457] |
| WOS研究方向 | Thermodynamics ; Energy & Fuels |
| 语种 | 英语 |
| WOS记录号 | WOS:001204687900001 |
| 出版者 | PERGAMON-ELSEVIER SCIENCE LTD |
| 源URL | [http://119.78.100.198/handle/2S6PX9GI/41103]  |
| 专题 | 中科院武汉岩土力学所 |
| 通讯作者 | Zhuo, Cuiyao |
| 作者单位 | 1.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Peoples R China 2.Shijiazhuang Tiedao Univ, Collaborat Innovat Ctr Performance & Secur Large s, Shijiazhuang 050043, Hebei, Peoples R China 3.Shijiazhuang Tiedao Univ, Sch Safety Engn & Emergency Management, Shijiazhuang 050043, Hebei, Peoples R China 4.Shijiazhuang Tiedao Univ, Sch Civil Engn, Shijiazhuang 050043, Hebei, Peoples R China |
| 推荐引用方式 GB/T 7714 | Li, Haoran,Wei, Qun,Xu, Zhuang,et al. Empirical analysis of unloading creep damage mechanism of salt rock at 110 °C[J]. ENERGY,2024,294:12. |
| APA | Li, Haoran.,Wei, Qun.,Xu, Zhuang.,Zhuo, Cuiyao.,Dong, Zhikai.,...&Shi, Xilin.(2024).Empirical analysis of unloading creep damage mechanism of salt rock at 110 °C.ENERGY,294,12. |
| MLA | Li, Haoran,et al."Empirical analysis of unloading creep damage mechanism of salt rock at 110 °C".ENERGY 294(2024):12. |
入库方式： OAI收割
来源：武汉岩土力学研究所
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