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An Angle-Based Method Dealing with Vertex-Vertex Contact in the Two-Dimensional Discontinuous Deformation Analysis (DDA)
Fan, Huo1,2,3,4; He, Siming2,3,4
Corresponding AuthorFan, Huo
2015
Source PublicationROCK MECHANICS AND ROCK ENGINEERING
ISSN0723-2632
EISSN1434-453X
Volume48Issue:5Pages:2031-2043
SubtypeArticle
AbstractDue to the discontinuity of the direction of a normal vector at the corner, vertex-vertex contact is indeterminate in numerical modelling. Two classes are indeterminate in two-dimensional discontinuous deformation analysis (DDA), designated as "genuine indeterminacy" and "pseudo indeterminacy". While examining these indeterminacies, it is necessary to pre-process quasi-vertex-vertex contact and determine contact or entrance edges. On one hand, improper pre-processing not only changes the equilibrium equations of the system, but also increases the burden on open-close iteration. On the other hand, there are two kinds of quasi-contact edges, i.e. the same and different block quasi-contact edges. Certain previous distance-based methods, which are used to seek the correct entrance edge, lead to some forced contacts, including vertex-vertex or vertex-edge. New pre-processing and angle-based methods for determining entrance edges are developed in this study. Additionally, the new concept of strengthening the movement trend of blocks is presented in DDA. The new pretreatment method combining the angle-based method and a strategy for strengthening the movement trend of blocks are intended to reduce forced contacts, maintain the movement trend of blocks, and speed up open-close iterations to a certain extent. Furthermore, the new method only depends on the orientation of quasi-contact edges and the movement trend of convex corners. The effectiveness of these improvements is verified by translational motion, rotation trend, and time-step size effect tests.
KeywordDda Vertex-vertex Contact Indeterminacy Pretreatment Angle-based Method
WOS HeadingsScience & Technology ; Technology ; Physical Sciences
DOI10.1007/s00603-014-0692-8
WOS Subject ExtendedEngineering ; Geology
Indexed BySCI
Language英语
Quartile3区
TOP
WOS SubjectEngineering, Geological ; Geosciences, Multidisciplinary
WOS IDWOS:000360006700018
Funding OrganizationNSFC(41272346 ; National Key Technology Support Program(2011BAK12B03) ; 41101008)
Citation statistics
Cited Times:27[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imde.ac.cn/handle/131551/10914
Collection山地灾害与地表过程重点实验室
Affiliation1.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
2.Chinese Acad Sci, Key Lab Mt Hazards & Surface Proc, Chengdu 610041, Peoples R China
3.Chinese Acad Sci, Inst Mt Hazards & Environm, Chengdu 610041, Peoples R China
4.Chinese Acad Sci, Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China
First Author Affilication中国科学院水利部成都山地灾害与环境研究所
Recommended Citation
GB/T 7714
Fan, Huo,He, Siming. An Angle-Based Method Dealing with Vertex-Vertex Contact in the Two-Dimensional Discontinuous Deformation Analysis (DDA)[J]. ROCK MECHANICS AND ROCK ENGINEERING,2015,48(5):2031-2043.
APA Fan, Huo,&He, Siming.(2015).An Angle-Based Method Dealing with Vertex-Vertex Contact in the Two-Dimensional Discontinuous Deformation Analysis (DDA).ROCK MECHANICS AND ROCK ENGINEERING,48(5),2031-2043.
MLA Fan, Huo,et al."An Angle-Based Method Dealing with Vertex-Vertex Contact in the Two-Dimensional Discontinuous Deformation Analysis (DDA)".ROCK MECHANICS AND ROCK ENGINEERING 48.5(2015):2031-2043.
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