DEM simulations of sandstone under true triaxial compressive tests

doi:10.1007/s11440-016-0480-6

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	DEM simulations of sandstone under true triaxial compressive tests
	Kwok, C. Y.2,3; Duan, K.2,3; Ma, X.1,4
刊名	ACTA GEOTECHNICA
	2017
卷号	12 期号:3 页码:495-510
关键词	Discrete element method Micro-mechanisms Porous sandstone True triaxial test
ISSN号	1861-1125
DOI	10.1007/s11440-016-0480-6
英文摘要	Numerically simulated true triaxial compression tests (sigma(1) >= sigma(2) >= sigma(3)) are conducted in this study to elucidate the failure mechanism of sandstone using 3D discrete element method (DEM), in particular the effect of the intermediate principal stress (sigma(2)). Eight series of tests (sigma(3) = 0, 10, 20, 30, 40, 50, 70, and 100 MPa) are conducted. Within each series, sigma(2) is varied from sigma(2) = sigma(3) to sigma(2) = sigma(1) from test to test. For each test, sigma(1) is raised monotonically to failure while keeping sigma(2) and sigma(3) constant. The DEM simulations reveal the effect of sigma(2) on the variations of peak stress, Young's modulus, failure plane angles, the brittle-ductile transition, and the evolution of failure modes, the effect beyond the well-understood effect of sigma(3). The simulation is in qualitative agreement with the results obtained experimentally. Detailed analyses performed on the particle-scale responses further the understanding of the microscopic mechanisms. The distribution of contact force becomes more homogeneous with the increase of sigma(3), which leads to the resulting damage being more localized rather than diffused. The interaction between contact force distribution and coalescence of cracks determines the processes and patterns of fracturing in the sample scale. sigma(2) is found to affect the microscopic stress distribution as well as structure evolution, and this effect weakens with the increase of sigma(3).
WOS研究方向	Engineering
语种	英语
出版者	SPRINGER HEIDELBERG
WOS记录号	WOS:000401559800003
内容类型	期刊论文
源URL	[http://119.78.100.198/handle/2S6PX9GI/4067]
专题	岩土力学所知识全产出_期刊论文国家重点实验室知识产出_期刊论文
作者单位	1.Stanford Univ, Dept Geophys 2.Chinese Acad Sci, State Key Lab Geomech & Geotech Engn, Inst Rock & Soil Mech ; 3.Univ Hong Kong, Dept Civil Engn ; 4.Univ Wisconsin, Geol Engn Program;
推荐引用方式 GB/T 7714	Kwok, C. Y.,Duan, K.,Ma, X.. DEM simulations of sandstone under true triaxial compressive tests[J]. ACTA GEOTECHNICA,2017,12(3):495-510.
APA	Kwok, C. Y.,Duan, K.,&Ma, X..(2017).DEM simulations of sandstone under true triaxial compressive tests.ACTA GEOTECHNICA,12(3),495-510.
MLA	Kwok, C. Y.,et al."DEM simulations of sandstone under true triaxial compressive tests".ACTA GEOTECHNICA 12.3(2017):495-510.