Damage evaluation of rock salt under multilevel cyclic loading with constant stress intervals using AE monitoring and CT scanning

doi:10.1016/j.petrol.2021.109517

	Damage evaluation of rock salt under multilevel cyclic loading with constant stress intervals using AE monitoring and CT scanning
	Zhao, Kai 1,2; Ma, Hongling 2; Liang, Xiaopeng 1,2; Li, Xiaoxiao 1,2; Liu, Yibiao 1,2; Cai, Rui 1,2; Ye, Liangliang 1,2; Yang, Chunhe 2
刊名	JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
	2022
卷号	208 页码:16
关键词	Rock salt Multilevel cyclic loading Constant stress intervals Acoustic emission CT scanning Damage evaluation
ISSN号	0920-4105
DOI	10.1016/j.petrol.2021.109517
英文摘要	When salt caverns are used for the medium of underground energy storage, the surrounding rock experiences cyclic loading due to periodical injection-production. The cyclic load contains constant stress intervals and varied stress amplitudes, which threatens the stability of the salt caverns. In this study, multilevel cyclic loading with constant stress intervals on rock salt were conducted under uniaxial compression conditions. Acoustic emission (AE) monitoring and post-test computed tomography (CT) scanning were used to evaluate the damage evolution during the loading process. Results show that the density of the hysteresis loops in overall stress-strain curves present two-stage alternating sparse and dense loops during the loading. The cumulative AE count/energy increases with increasing the number of cycles and loading stage, and the growth rate for a single stage gradually becomes constant. The AE signals were divided into six kinds according to frequency-amplitude distribution. The presence of stress intervals increases the number of cracks and the median scale cracks account for about 90% of the total number of cracks. By analyzing the CT images, the crack morphology of the salt sample without hold time shows several inclined main cracks with numerous branch microcracks while that with the hold time of 20 s shows multiple branch cracks and numerous microcracks. To quantitatively evaluate damage evolution during the loading process, a damage variable is defined based on the relative variation of AE parameters. The damage accumulation for a single loading stage presents a two-phase pattern, and the damage degree during the accelerated deformation accounts for approximately half of the total damage. This study can provide guidance for designing the operation parameters when salt caverns are used for the storage of natural gas, air and CO2.
资助项目	National Natural Science Foundation of China[51874243] ; National Natural Science Foundation of China[51874274] ; National Natural Science Foundation of China[51774266] ; Youth Innovation Promotion Association CAS[2019324] ; Strategic Research and Consulting Project of Chinese Academy of Engineering[2021-XY-23] ; Special Fund for Strategic Pilot Technology of Chinese Academy of Sciences[XDPB21] ; Science and Technology Research Project of Jiangxi Provincial Department of Education[GJJ200634] ; Major Research Development Program of Hebei province[21374101D]
WOS研究方向	Energy & Fuels ; Engineering
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000710878400034
内容类型	期刊论文
源URL	[http://119.78.100.198/handle/2S6PX9GI/28254]
专题	中科院武汉岩土力学所
通讯作者	Ma, Hongling
作者单位	1.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 2.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Peoples R China
推荐引用方式 GB/T 7714	Zhao, Kai,Ma, Hongling,Liang, Xiaopeng,et al. Damage evaluation of rock salt under multilevel cyclic loading with constant stress intervals using AE monitoring and CT scanning[J]. JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING,2022,208:16.
APA	Zhao, Kai.,Ma, Hongling.,Liang, Xiaopeng.,Li, Xiaoxiao.,Liu, Yibiao.,...&Yang, Chunhe.(2022).Damage evaluation of rock salt under multilevel cyclic loading with constant stress intervals using AE monitoring and CT scanning.JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING,208,16.
MLA	Zhao, Kai,et al."Damage evaluation of rock salt under multilevel cyclic loading with constant stress intervals using AE monitoring and CT scanning".JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING 208(2022):16.