Experimental study of the self-healing property of damaged salt rock by Brazilian splitting

JIANG De-yi; JIANG Chang-qi; CHEN Jie; KANG Yan-fei; LIU Wei; DU Chao

doi:10.13374/j.issn2095-9389.2019.06.04.001

Volume 42 Issue 5

May 2020

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Article Navigation > Chinese Journal of Engineering > 2020 > 42(5): 570-577

JIANG De-yi, JIANG Chang-qi, CHEN Jie, KANG Yan-fei, LIU Wei, DU Chao. Experimental study of the self-healing property of damaged salt rock by Brazilian splitting[J]. Chinese Journal of Engineering, 2020, 42(5): 570-577. doi: 10.13374/j.issn2095-9389.2019.06.04.001

Citation:

JIANG De-yi, JIANG Chang-qi, CHEN Jie, KANG Yan-fei, LIU Wei, DU Chao. Experimental study of the self-healing property of damaged salt rock by Brazilian splitting[J]. Chinese Journal of Engineering, 2020, 42(5): 570-577. doi: 10.13374/j.issn2095-9389.2019.06.04.001

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Experimental study of the self-healing property of damaged salt rock by Brazilian splitting

doi: 10.13374/j.issn2095-9389.2019.06.04.001

JIANG De-yi^{1, 2},
JIANG Chang-qi^{1, 2},
CHEN Jie^{1, 2
,
,},
KANG Yan-fei^{1, 2},
LIU Wei^{1, 2},
DU Chao^{1, 2}

1.
State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China
2.
College of Resources and Environmental Science, Chongqing University, Chongqing 400044, China

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Corresponding author: E-mail: chenjie_cqu@163.com
Received Date: 2019-06-04
Publish Date: 2020-05-01

Abstract

Abstract

Given its good physical and mechanical properties and chemical stability, salt rock is considered to be the ideal rock mass for underground reservoir construction. To safeguard China’s energy security and strategic needs, a large number of underground salt cave reservoirs have been built in recent years. In view of the accidents caused by the instability of gas storage in foreign countries, the physical and mechanical properties of salt rock need to be investigated in depth to ensure the long-term stability of salt caverns. The damage-healing characteristics of salt rock have an important influence on the long-term airtightness of underground salt caverns. To examine the healing properties of damaged salt rock, a self-healing experiment was conducted on Brazilian cracked salt rock. Under the no-stress condition, the Brazilian cracked salt rock was healed under different humidity conditions for 120 days. The change in the permeability of the sample was quantitatively evaluated, and the damage-healing characteristics of salt rock under different humidity conditions and healing times were examined. In addition, the microscopic morphology of the damaged salt rock after healing was observed through scanning electron microscopy, and the mesoscopic mechanism of salt rock damage healing was discussed. In this experiment, the change in the permeability of the sample before and after the experiment was used to characterize salt rock damage, which effectively avoided the unreliable results obtained in previous studies through strain hardening, where the strength and elastic moduli of the samples were used to assess damage healing. The experimental results show that, under the no-stress condition, the specimens placed in the environment without external water supply are not healed after 120 days, which proves that water is a necessary condition for wound healing. Previous studies have shown that time and humidity have an important influence on salt rock damage healing. The damage-healing effect on salt rock increases with time and humidity. However, the rate of increase decreases exponentially, which indicates that excessive humidity and time do not effectively improve the damage-healing effect on salt rock.
- salt rock,
- damage,
- healing,
- Brazilian splitting,
- permeability

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References(24)

References

[1]	鄭明陽. 中鹽金壇: 鹽穴不僅儲氣儲油還儲能. 中國鹽業, 2017(15):52 Zheng M Y. Zhongyan Jin Tan: salt cavern not only stores gas, but also stores energy. China Salt Ind, 2017(15): 52
[2]	尹洪武, 馬洪嶺, 施錫林, 等. 鹽穴儲氣庫泥巖夾層滲透性測試新方法. 巖土力學, 2017, 38(8):2241 Yin H W, Ma H L, Shi X L, et al. A new method for permeability test on mudstone interlayer in a salt cavern gas storage. Rock Soil Mech, 2017, 38(8): 2241
[3]	李銀平, 孔慶聰, 施錫林, 等. 鹽穴地下儲庫地表沉降的黏彈模型及應用. 巖土力學, 2017, 38(7):2049 Li Y P, Kong Q C, Shi X L, et al. Viscoelastic model of surface subsidence of salt cavern storage and its application. Rock Soil Mech, 2017, 38(7): 2049
[4]	劉建鋒, 邊宇, 鄭得文, 等. 三軸應力狀態下鹽巖強度分析探討. 巖土力學, 2014, 35(4):919 Liu J F, Bian Y, Zheng D W, et al. Discussion on strength analysis of salt rock under triaxial compressive stress. Rock Soil Mech, 2014, 35(4): 919
[5]	Tsang C F, Bernier F, Davies C. Geohydromechanical processes in the excavation damaged zone in crystalline rock, rock salt, and indurated and plastic clays—in the context of radioactive waste disposal. Int J Rock Mech Min Sci, 2005, 42(1): 109 doi: 10.1016/j.ijrmms.2004.08.003
[6]	Chan K S, Bodner S R, Munson D E. Permeability of WIPP salt during damage evolution and healing. Int J Damage Mech, 2001, 10(4): 347 doi: 10.1106/H3UV-1URA-AFUY-FX49
[7]	Smith D L, Evans B. Diffusional crack healing in quartz. J Geophys Res:Solid Earth, 1984, 89(B6): 4125 doi: 10.1029/JB089iB06p04125
[8]	Urai J L, Spiers C J, Zwart H J, et al. Weakening of rock salt by water during long-term creep. Nature, 1986, 324(6097): 554 doi: 10.1038/324554a0
[9]	Cinar Y, Pusch G, Reitenbach V. Petrophysical and capillary properties of compacted salt. Transport Porous Media, 2006, 64(2): 199 doi: 10.1007/s11242-005-2848-1
[10]	Peach C J, Spiers C J, Trimby P W. Effect of confining pressure on dilatation, recrystallization, and flow of rock salt at 150 C. J Geophys Res:Solid Earth, 2001, 106(B7): 13315 doi: 10.1029/2000JB900300
[11]	Ter Heege J H, De Bresser J H P, Spiers C J. Rheological behaviour of synthetic rocksalt: the interplay between water, dynamic recrystallization and deformation mechanisms. J Struct Geol, 2005, 27(6): 948 doi: 10.1016/j.jsg.2005.04.008
[12]	Houben M E, ten Hove A, Peach C J, et al. Crack healing in rocksalt via diffusion in adsorbed aqueous films: Microphysical modelling versus experiments. Phys Chem Earth,Parts A/B/C, 2013, 64: 95 doi: 10.1016/j.pce.2012.10.001
[13]	Zhu C, Arson C. A model of damage and healing coupling halite thermo-mechanical behavior to microstructure evolution. Geotech Geol Eng, 2015, 33(2): 389 doi: 10.1007/s10706-014-9797-9
[14]	Koelemeijer P J, Peach C J, Spiers C J. Surface diffusivity of cleaved NaCl crystals as a function of humidity: impedance spectroscopy measurements and implications for crack healing in rock salt. J Geophys Res:Solid Earth, 2012, 117(B1): B01205
[15]	王軍保, 劉新榮, 黃明, 等. 低頻循環荷載下鹽巖軸向蠕變的Burgers模型分析. 巖土力學, 2014, 35(4):933 Wang J B, Liu X R, Huang M, et al. Analysis of axial creep properties of rock under low frequency cyclic loading using Burgers model. Rock Soil Mech, 2014, 35(4): 933
[16]	王兵武, 李銀平, 楊春和, 等. 界面傾角對復合層狀物理模型材料力學特性的影響研究. 巖土力學, 2015, 36(增刊2): 139 Wang B W, Li Y P, Yang C H, et al. Influences of interface inclination on mechanical properties of composite bedded physical model material. Rock Soil Mech, 2015, 36(Suppl 2): 139
[17]	郭印同, 楊春和, 付建軍. 鹽巖三軸卸荷力學特性試驗研究. 巖土力學, 2012, 33(3):725 doi: 10.3969/j.issn.1000-7598.2012.03.012 Guo Y T, Yang C H, Fu J J. Experimental research on mechanical characteristics of salt rock under triaxial unloading test. Rock Soil Mech, 2012, 33(3): 725 doi: 10.3969/j.issn.1000-7598.2012.03.012
[18]	康燕飛, 陳結, 姜德義, 等. 不同溫度條件下鹽巖鹵水浸泡后損傷自恢復特性. 巖土力學, 2019, 40(2):601 Kang Y F, Chen J, Jiang D Y, et al. Damage self-healing property of salt rock after brine immersion under different temperatures. Rock Soil Mech, 2019, 40(2): 601
[19]	姜德義, 王雷, 陳結, 等. 損傷鹽巖短期自恢復特性試驗研究. 巖土工程學報, 2015, 37(4):594 doi: 10.11779/CJGE201504003 Jiang D Y, Wang L, Chen J, et al. Experimental research on properties of short-term self recovery of damaged salt rock. Chin J Geotech Eng, 2015, 37(4): 594 doi: 10.11779/CJGE201504003
[20]	梁衛國, 徐素國, 趙陽升. 損傷巖鹽高溫再結晶剪切特性的試驗研究. 巖石力學與工程學報, 2004, 23(20):3413 doi: 10.3321/j.issn:1000-6915.2004.20.004 Liang W G, Xu S G, Zhao Y S. Experimental study on heating recrystallization effect on shear characteristics of damaged rock salt. Chin J Rock Mech Eng, 2004, 23(20): 3413 doi: 10.3321/j.issn:1000-6915.2004.20.004
[21]	向高, 劉建鋒, 鄒航, 等. 圍壓作用下鹽巖損傷恢復研究. 工程科學與技術, 2017, 49(增刊2): 135 Xiang G, Liu J F, Zou H, et al. Study of damage recovery of salt rock under confining pressures. Adv Eng Sci, 2017, 49(Suppl 2): 135
[22]	陳祥勝, 李銀平, 尹洪武, 等. 多夾層鹽礦地下儲氣庫氣體滲漏評價方法. 巖土力學, 2018, 39(1):11 Chen X S, Li Y P, Yin H W, et al. Gas leakage assessment method of underground gas storage in multi-interlayer salt mine. Rock Soil Mech, 2018, 39(1): 11
[23]	陳結, 劉劍興, 姜德義, 等. 圍壓作用下鹽巖應變與損傷恢復試驗研究. 巖土力學, 2016, 37(1):105 Chen J, Liu J X, Jiang D Y, et al. An experimental study of strain and damage recovery of salt rock under confining pressures. Rock Soil Mech, 2016, 37(1): 105
[24]	劉劍興. 巖鹽損傷愈合宏、細觀特征研究[學位論文]. 重慶: 重慶大學, 2015 Liu J X. The Macro and Mesoscopic Characteristics Study on Damage Healing of Salt Rock [Dissertation]. Chongqing: Chongqing University, 2015