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| Experimental study on unloading rate effect of confining pressure on dilatation damage of surrounding rock in salt cavern gas storage
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| ZHAO Desheng1，2，LIANG Weiguo1，2，ZHANG Shengli2，XIAO Ning1，2，LI Jing1，2，LI Chao1，2 |
| (1. College of Mining Engineering，Taiyuan University of Technology，Taiyuan，Shanxi 030024，China；2. Key Laboratory of In-situ Property-improving Mining of Ministry of Education，Taiyuan University of Technology，Taiyuan，Shanxi 030024，China) |
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Abstract The rapid declination of the internal pressure in salt rock storage caverns leads to the dilatation and damage of the surround rocks. The effects of the initial confining pressure and unloading rate on the dilatation damage characteristics of salt rocks are studied in the present work，through the triaxial test with unloading confining pressure at constant axial stresses. The experimental results show that: at the same unloading rate，the higher the initial confining pressure，the larger the dilatation in the unloading stage. The mean volume strain at the confining stresses of 12 and 18 MPa increases by 7.1% and 21.4%，respectively，compared with that at the initial confining pressure of 6 MPa. Additionally，slow unloading rate of confining pressure is conductive to dilatation. As the unloading rate decreases from 0.2 MPa/s to 0.02，0.002 and 0.000 2 MPa/s，the mean volume strain increases by 60.2%，103.5% and 282.1%，respectively. In the unloading process，the larger the dilatation，the more serious the internal damage. The deformation modulus in the unloading stage decreases with the unloading of confining pressure. The larger the initial confining pressure and the unloading rate，the larger the deformation modulus reduces. The damage variable and the energy absorbed by salt rock in the unloading stage increase linearly with the increase of initial confining pressure，and on the other hand，decrease exponentially with the increase of unloading rate. The more energy absorbed，the more serious the internal damage.
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| [1] BéREST P，BROUARD B，DURUP J G. Tightness tests in salt cavern wells[J]. Oil and Gas Science and Technology，2001，56(5)：451–469.
[2] BéREST P，BROUARD B. Safety of salt caverns used for underground storage blow out[J]. Oil and Gas Science and Technology，2003，58(3)：361–384.
[3] 陈祥胜，李银平，施锡林，等. 地下盐穴储气库泄漏原因及防治措施研究[J]. 岩土力学，2019，40(增1)：367–373.(CHEN Xiangsheng，LI Yingpin，SHI Xilin，et al. Analysis of leakage risks and prevention measures of underground salt cavern gas storage[J]. Rock and Soil Mechanics，2019，40(Supp.1)：367–373.(in Chinese))
[4] 井文君，杨春和，陈 锋. 基于事故统计分析的盐岩地下油/气储库风险评价[J]. 岩土力学，2011，32(6)：1 787–1 793.(JING Wenjun，YANG Chunhe，CHEN Feng. Risk assessment of salt cavern oil/gas storage based on accident statistical analysis[J]. Rock and Soil Mechanics，2011，32(6)：1 787–1 793.(in Chinese))
[5] 刘金森，陈 健，陈祥胜，等. 地下盐岩储库泄漏事故统计分析及启示[J]. 中国煤炭地质，2020，32(6)：64–69.(LIU Jinsen，CHEN Jian，CHEN Xiangsheng，et al. Statistical analysis of underground salt rock gas storage leakage accidents and enlightenment[J]. Coal Geology of China，2020，32(6)：64–69.(in Chinese))
[6] 王者超，李 崴，刘 杰，等. 地下储气库发展现状与安全事故原因综述[J]. 隧道与地下工程灾害防治，2019，1(2)：49–58. (WANG Zhechao，LI Wei，LIU Jie，et al．A review on state-of-the-art of underground gas storage and causes of typical accidents[J]. Hazard Control in Tunnelling and Underground Engineering，2019，1(2)：49–58.(in Chinese))
[7] 陈 锋，杨春和，白世伟. 盐穴储气库最佳采气速率数值模拟研究[J]. 岩土力学，2007，28(1)：57–62.(CHEN Feng，YANG Chunhe，BAI Shiwei，Investigation on optimized gas recovery velocity of natural gas storage in salt layer by numerical simulation[J]. Rock and Soil Mechanics，2007，28(1)：57–62.(in Chinese))
[8] GILLHAUS A. Natural gas storage in salt caverns-present Status，developments and future trends in Europe[C]// SMRI Spring Meeting. Basel，Switzerland：[s. n.]，2007：69–87.
[9] 张 强，王军保，宋战平，等. 循环荷载作用下盐岩微观结构变化及经验疲劳模型[J]. 岩土力学，2022，43(4)：1–14.(ZHANG Qiang，WANG Junbao，SONG Zhanping，et al. Microstructure variation and empirical fatigue model of salt rock under cyclic loading[J]. Rock and Soil Mechanics，2022，43(4)：1–14.(in Chinese))
[10] FUENKAJORN K，PHUEAKPHUM D. Effects of cyclic loading on mechanical properties of Maha Sarakham salt[J]. Engineering Geology，2010，112(1/4)：43–52.
[11] 郭印同，杨春和，付建军. 盐岩三轴卸荷力学特性试验研究[J]. 岩土力学，2012，33(3)：725–730.(GUO Yintong，YANG Chunhe，FU Jianjun. Experimental research on mechanical characteristics of salt rock under triaxial unloading test[J]. Rock and Soil Mechanics，2012，33(3)：725–730.(in Chinese))
[12] CHEN J，JIANG D Y. Comparison of the characteristics of rock salt exposed to loading and unloading of confining pressures[J]. Acta Geotechnica，2016，11(1)：221–230.
[13] 陈卫忠，吕森鹏，郭小鹏，等. 脆形岩石卸围压试验与岩爆机制研究[J]. 岩土工程学报，2010，32(6)：963–969.(CHEN Weizhong，LU Senpeng，GUO Xiaopeng，et al. Unloading confining pressure for brittle rock and mechanism of rock burst[J]. Chinese Journal of Geotechnical Engineering，2010，32(6)：963–969.(in Chinese))
[14] 陈卫忠，吕森鹏，郭小红，等. 基于能量原理的卸围压试验与岩爆判据研究[J]. 岩石力学与工程学报，2009，28(8)：1 530–1 540.(CHEN Weizhong，LU Senpeng，GUO Xiaohong，et al. Research on unloading confining pressure tests and rockburst criterion based on energy theory[J]. Chinese Journal of Rock Mechanics and Engineering，2009，28(8)：1 530–1 540.(in Chinese))
[15] 邱士利，冯夏庭，张传庆，等. 不同卸围压速率下深埋大理岩卸荷力学特性试验研究[J]. 岩石力学与工程学报，2010，29(9)：1 807–1 817.(QIU Shili，FENG Xiating，ZHANG Chuanqing，et al. Experimental research on mechanical properties of deep-buried marble under different unloading rates of confining pressures[J]. Chinese Journal of Rock Mechanics and Engineering，2010，29(9)：1 807–1 817.(in Chinese))
[16] 王超圣，周宏伟，何树生，等. 卸载速率对北山花岗岩强度影响研究[J]. 岩土力学，2017，38(增2)：151–157.(WANG Chaosheng，ZHOU Hongwei，HE Shousheng，et al. Effect of unloading rates on strength of Beishan granite[J]. Rock and Soil Mechanics，2017，38(Supp.2)：151–157.(in Chinese))
[17] 何满潮，赵 菲，杜 帅，等. 不同卸载速率下岩爆破坏特征试验分析[J]. 岩土力学，2014，35(10)：2 737–2 747.(HE Manchao，ZHAO Fei，DU Shuai，et al. Rockburst characteristics based on experimental tests under different unloading rates[J]. Rock and Soil Mechanics，2014，35(10)：2 737–2 747.(in Chinese))
[18] 邓华锋，王 哲，李建林，等. 卸荷速率和孔隙水压力对砂岩卸荷特性影响研究[J]. 岩土工程学报，2017，39(11)：1 976–1 983. (DENG Huafeng，WANG Zhe，LI Jianlin，et al. Effect of unloading rate and pore water pressure on mechanical properties of sandstone[J]. Chinese Journal of Geotechnical Engineering，2017，39(11)：1 976–1 983.(in Chinese))
[19] LI X B，CHEN Z H，LEI W G. Unloading responses of preflawed rock specimens under different unloading rates[J]. Transactions of Nonferrous Metals Society of China，2019：1 516–1 526.
[20] BEREST P，DJIZANNE H，BROUARD B，et al. Rapid depressurizations：can they lead to irreversible damage[C]// SMRI Fall Meeting. Regina：[s. n.]，2012：64–83.
[21] 姜德义，范金洋，陈 结，等. 围压卸载速率对盐岩扩容损伤影响研究[J]. 岩石力学与工程学报，2013，32(增2)：3 154–3 159.(JIANG Deyi，FAN Jinyang，CHEN Jie，et al. Research on capacity expansion damage of the salt under the different rates of confining pressure unloading[J]. Chinese Journal of Rock Mechanics and Engineering，2013，32(Supp.2)：3 154–3 159.(in Chinese))
[22] 姜德义，范金洋，陈 结，等. 盐岩在围压卸荷作用下的扩容特征研究[J]. 岩土力学，2013，34(7)：1 881–1 886.(JIANG Deyi，FAN Jinyang，CHEN Jie，et al. Study of dilatancy characteristics of salt rock under unloading action of confining pressure[J]. Rock and Soil Mechanics，2013，34(7)：1 881–1 886.(in Chinese))
[23] HAN Y，MA H L，YANG C H，et al. The mechanical behavior of rock salt under different confining pressure unloading rates during compressed air energy storage(CAES)[J]. Journal of Petroleum Science and Engineering，2021，196：107676.
[24] 马林建，刘新宇，许宏发，等. 井喷失控条件下盐岩储库稳定性分析[J]. 岩土力学，2011，32(9)：2 791–2 797.(MA Linjian，LIU Xinyu，XU Hongfa，et al. Stability analysis of salt gas storage cavern under uncontrolled blow out[J]. Rock and Soil Mechanics，2011，32(9)： 2 791–2 797.(in Chinese))
[25] 马林建，许宏发，王明洋，等．层状盐穴储气库运营压力失控全过程稳定性分析[J]. 岩石力学与工程学报，2015，24(增2)：4 108–4 115. (MA Linjian，XU Hongfa，WANG Mingyang，et al. Numerical study of gas storage stability in bedded rock salt during the complete process of operating pressure runaway[J]. Chinese Journal of Rock Mechanics and Engineering，2015，24(Supp.2)：4 108–4 115.(in Chinese))
[26] 任 松，白月明，姜德义，等. 周期荷载作用下盐岩声发射特征试验研究[J]. 岩土力学，2012，33(6)：1 613–1 618.(REN Song，BAI Yueming，JIANG Deyi，et al. Experimental research on acoustic emission property of salt rock under cyclic loading[J]. Rock and Soil Mechanics，2012，33(6)：1 613–1 618.(in Chinese))
[27] 李 林，陈军朝，吴教锟，等. 循环围压下的盐岩扩容特征[J]. 东北大学学报：自然科学版，2016，37(10)：1 485–1 490.(LI Lin，CHEN Junchao，WU Jiaokun，et al. Expansion characteristics of salt rock under cyclic confining pressure[J]. Journal of Northeastern University：Natural Science，2016，37(10)：1 485–1 490.(in Chinese))
[28] BIENIAWSKI Z T，BERNEDE M J. Suggested methods for determining the uniaxial compressive strength and deformation of rock materials[J]. International Journal of Rock Mechanics and Mining Sciences and Geomechanics Abstracts，1979，16(2)：138–140.
[29] 高玉春，徐 进，何 鹏. 大理岩加卸载力学特性的研究[J]. 岩石力学与工程学报，2005，24(3)：456–460.(GAO Yuchun，XU Jin，HE Peng. Study of mechanical properties of marble under loading and unloading conditions[J]. Chinese Journal of Rock Mechanics and Engineering，2005，24(3)：456–460.(in Chinese))
[30] 黄润秋，黄 达. 卸荷条件下花岗岩力学特性试验研究[J]. 岩石力学与工程学报，2008，27(11)：2 205–2 213.(HUANG Runqiu，HUANG Da. Experimental study on mechanical properties of granite under loading conditions[J]. Chinese Journal of Rock Mechanics and Engineering，2008，27(11)：2 205–2 213.(in Chinese))
[31] 赵国彦，戴 兵，董陇军，等. 不同应力路径下岩石三轴卸荷力学 特性与强度准则研究[J]. 岩土力学，2015，36(11)：3 121–3 127. (ZHAO Guoyan，DAI Bing，DONG Longjun，et al. Experimental research on mechanical characteristics and strength criterion of rock triaxial unloading tests under different stress paths[J]. Rock and Soil Mechanics，2015，36(11)：3 121–3 127.(in Chinese))
[32] 赵明阶，徐 蓉. 岩石损伤特性与强度的超声波速研究[J]. 岩土工程学报，2000，22(6)：720–722.(ZHAO Mingjie，XU Rong. The rock damage and strength study based on ultrasonic velocity[J]. Chinese Journal of Geotechnical Engineering，2000，22(6)：720–722.(in Chinese))
[33] 柴文革. 围压卸载条件下花岗岩损伤演化与破坏试验研究[博士学位论文][D]. 北京：中国矿业大学，2009.(CHAI Wenge. Experimental research on damage evolution and fail of granite under unloading confining pressure[Ph. D. Thesis][D]. Beijing：China University of Mining and Technology，2009.(in Chinese))
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2022, Vol. 41 
