DEM investigation on the mechanical behavior of mudstone in the hollow cylinder torsional shear test

doi:10.1016/j.compgeo.2021.104236

	DEM investigation on the mechanical behavior of mudstone in the hollow cylinder torsional shear test
	Liu, Yiming 1; Mao, Haijun 2,3; Xu, Chenming 1; Zhang, Ye 4,5
刊名	COMPUTERS AND GEOTECHNICS
	2021-09-01
卷号	137 期号:-页码:15
关键词	Mudstone Principal stress rotation Discrete element method Failure mode
ISSN号	0266-352X
DOI	10.1016/j.compgeo.2021.104236
英文摘要	The discrete element method (DEM) has been used to investigate the mechanical and failure behavior and the associated micro-cracking process of mudstone under the hollow cylinder torsional test by using a commercial DEM code PFC3D. Micro-parameters of the numerical model were first calibrated to the experimental results of the uniaxial compression tests and the uniaxial tensile tests. Based on the calibration results, numerical hollow cylindrical torsional shear tests were carried out under three typical stress conditions, i.e. triaxial compression, torsional compression and pure torsional shear. The numerical results show that the mechanical behavior of mudstone, in terms of rock strength, micro-crack initiation and propagation, and failure mode, can be significantly affected by principal stress rotation, which is in line with previous experimental results. The analysis of the micro-crack process confirms that the principal stress rotation plays an important role in the initiation and propagation of micro-cracks. It is shown that the microcracks induced by tensile stress occur in a preferential direction parallel to the major principal stress sigma 1, while the orientation distribution of the shear micro-cracks is related to the shear bands. Furthermore, the initial micro-crack stress is found to decrease after introducing the principal stress rotation, which provides a new interpretation of degradation of strength and permeability of mudstone under principal stress rotation. Three typical failure modes of specimens in different loading states are reproduced in this study, and the microscopic mechanism is also discussed. Based on this study, it is found that ignoring the principal stress rotation may overrate the stability and tightness of underground storage in bedded rock salt caverns.
资助项目	National Natural Science Foundation of China[51808204]
WOS研究方向	Computer Science ; Engineering ; Geology
语种	英语
出版者	ELSEVIER SCI LTD
WOS记录号	WOS:000679979000002
内容类型	期刊论文
源URL	[http://119.78.100.198/handle/2S6PX9GI/27603]
专题	中科院武汉岩土力学所
作者单位	1.Hubei Univ Technol, Sch Civil Engn Architecture & Environm, Wuhan 430068, Hubei, Peoples R China 2.Chinese Acad Sci, Inst Rock & Soil Mech, Wuhan 430071, Hubei, Peoples R China 3.State Key Lab Geomech & Geotech Engn, Wuhan 430071, Hubei, Peoples R China 4.Chongqing Inst Geol & Mineral Resources, Natl Joint Engn Res Ctr Shale Gas Explorat & Dev, Chongqing 401120, Peoples R China 5.Chongqing Inst Geol & Mineral Resources, Key Lab Shale Gas Explorat, Minist Nat Resources Chong, Chongqing 401120, Peoples R China
推荐引用方式 GB/T 7714	Liu, Yiming,Mao, Haijun,Xu, Chenming,et al. DEM investigation on the mechanical behavior of mudstone in the hollow cylinder torsional shear test[J]. COMPUTERS AND GEOTECHNICS,2021,137(-):15.
APA	Liu, Yiming,Mao, Haijun,Xu, Chenming,&Zhang, Ye.(2021).DEM investigation on the mechanical behavior of mudstone in the hollow cylinder torsional shear test.COMPUTERS AND GEOTECHNICS,137(-),15.
MLA	Liu, Yiming,et al."DEM investigation on the mechanical behavior of mudstone in the hollow cylinder torsional shear test".COMPUTERS AND GEOTECHNICS 137.-(2021):15.