Crack initiation stress of brittle rock with different porosities

doi:10.1007/s10064-021-02187-5

	Crack initiation stress of brittle rock with different porosities
	Tang, Minghao 2; Wang, Guibin 1; Chen, Shiwan 3; Yang, Chunhe 1,2
刊名	BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
	2021-04-23
页码	16
关键词	Crack initiation stress Lateral strain Brittle rocks Lateral strain response Cyclic stressing Acoustic emissions
ISSN号	1435-9529
DOI	10.1007/s10064-021-02187-5
英文摘要	Accurately determining the crack initiation stress (CI) is of great importance to evaluate the stability of deep underground openings and the permeability of host rock in the near field. For this paper, uniaxial compression tests and increasing amplitude cyclic stressing tests were performed on four kinds of rocks with different porosities. The stress-strain data and acoustic emission (AE) data of these tests are analyzed to evaluate the applicability and accuracy of the existing methods for determining the CI. The results demonstrate that for marble and Beishan granite with low porosity, the lateral strain (LS) method is the simplest and most direct method to obtain the CILS. For high porosity sandstone, the result of lateral strain response (LSR) method is significantly smaller than that obtained by AE. The cumulative AE hits (CAEH) method heavily depends on the "S-shaped" characteristic of the cumulative AE hits curve, which limits its scope of application. The cumulative AE hits curve slope (CAHS) method, which determines the key inflection point of the cumulative AE hits curve by slope variation to determine the CICAHS, possesses the widest applicability and highest accuracy. The CI/UCS ratios of rocks with similar grain sizes decreases with increasing porosity. For Beishan granite, the average CICAHS is less than that of CILS. They are 0.43 UCS and 0.53 UCS, respectively. According to the residual strain data from the cyclic loading tests, the two crack initiation thresholds of Beishan granite can be clearly identified. These two crack initiation thresholds represent different crack initiation sequences in grain boundaries and different minerals.
资助项目	National Natural Science Foundation of China[51234004] ; Project of Decommissioning of Nuclear Facilities and Radioactive Waste Management ; National Key Research and Development Program of China[2017YFC0804601] ; National Key Research and Development Program of China[2018YFC0808403]
WOS研究方向	Engineering ; Geology
语种	英语
出版者	SPRINGER HEIDELBERG
WOS记录号	WOS:000642839800003
内容类型	期刊论文
源URL	[http://119.78.100.198/handle/2S6PX9GI/27230]
专题	中科院武汉岩土力学所
通讯作者	Wang, Guibin
作者单位	1.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Hubei, Peoples R China 2.Chongqing Univ, Sch Resources & Safety Engn, State Key Lab Coal Mine Disaster Dynam & Control, Chongqing 400044, Peoples R China 3.Guizhou Univ, Coll Resources & Environm Engn, Guiyang 550025, Guizhou, Peoples R China
推荐引用方式 GB/T 7714	Tang, Minghao,Wang, Guibin,Chen, Shiwan,et al. Crack initiation stress of brittle rock with different porosities[J]. BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT,2021:16.
APA	Tang, Minghao,Wang, Guibin,Chen, Shiwan,&Yang, Chunhe.(2021).Crack initiation stress of brittle rock with different porosities.BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT,16.
MLA	Tang, Minghao,et al."Crack initiation stress of brittle rock with different porosities".BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT (2021):16.