Full-field strain evolution and characteristic stress levels of rocks containing a single pre-existing flaw under uniaxial compression

doi:10.1007/s10064-020-01764-4

	Full-field strain evolution and characteristic stress levels of rocks containing a single pre-existing flaw under uniaxial compression
	Liu, Liwang 1,2; Li, Haibo 1,2; Li, Xiaofeng 2; Wu, Renjie 1,2
刊名	BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
	2020-08-01
卷号	79 期号:6 页码:3145-3161
关键词	Pre-existing flaw Digital image correlation method Full-field strain evolution Characteristic stress levels Discrete element method
ISSN号	1435-9529
DOI	10.1007/s10064-020-01764-4
英文摘要	In this study, full-field strain evolution and characteristic stress levels of marble samples containing a single pre-existing flaw were comprehensively studied. The full-field strain was performed by digital image correlation (DIC) method, and the variations of characteristic stress levels with respect to inclination angle were discussed. To compare the experimental results, discrete element method was adopted, and the full-field stress evolution was reproduced to reappraise the localization zones. The results indicate that the presence of pre-existing flaws induces strain localization and degradation of mechanical properties for pre-cracked samples. When the strain localization firstly appeared surrounding pre-existing flaws, the axial stress levels at this moment increase with regard to inclination angle, leading to the increase of peak strength, crack initiation stress, crack damage stress, and normalized crack initiation stress. The normalized crack damage stress obtained by experiments shows flaw independency, and the results were verified by simulation results. Based on the full-field stress evolution, the tensile stress inxdirection concentrates around pre-existing flaw and its location moves towards flaw tips with the increase of inclination angle. The compressive stress inydirection around pre-existing flaw is lower than other zones, revealing the upper and bottom surfaces of pre-existing flaw deform to each other. When the numerical models are subjected to same axial loading, the full-field stress around pre-existing flaw decrease as the inclination angle increases, which confirmed the results of full-field strain evolution and elucidated the pre-existing flaw with large inclination angle has less effect on degrading the mechanical properties.
WOS研究方向	Engineering ; Geology
语种	英语
出版者	SPRINGER HEIDELBERG
WOS记录号	WOS:000548716200027
内容类型	期刊论文
源URL	[http://119.78.100.198/handle/2S6PX9GI/24532]
专题	中科院武汉岩土力学所
通讯作者	Li, Xiaofeng
作者单位	1.Univ Chinese Acad Sci, Beijing 10049, 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	Liu, Liwang,Li, Haibo,Li, Xiaofeng,et al. Full-field strain evolution and characteristic stress levels of rocks containing a single pre-existing flaw under uniaxial compression[J]. BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT,2020,79(6):3145-3161.
APA	Liu, Liwang,Li, Haibo,Li, Xiaofeng,&Wu, Renjie.(2020).Full-field strain evolution and characteristic stress levels of rocks containing a single pre-existing flaw under uniaxial compression.BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT,79(6),3145-3161.
MLA	Liu, Liwang,et al."Full-field strain evolution and characteristic stress levels of rocks containing a single pre-existing flaw under uniaxial compression".BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT 79.6(2020):3145-3161.