期刊
COMPUTERS AND GEOTECHNICS
卷 150, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.compgeo.2022.104891
关键词
Contact detection; Global direct search (GDS); 3D convex polyhedral blocks; Distinct element method (DEM); Discontinuous deformation analysis (DDA); Meta contact
类别
资金
- National Natural Science Foundation of China [41902275, 41827807, 41130751]
- Joint Fund for Basic Research of High-speed Railway of National Natural Science Foundation of China, China Railway Corporation [U1934212, 4182780021]
- Emeishan-hanyuan highway Program by Sichuan Lehan Expressway Co., Ltd. [SRIG2019GG0004]
- Taihang mountain highway Program by China Power Construction Hebei Transportation Expressway investment Development Co., Ltd. [TH201908]
- Department of Science and Technology of Guizhou Province ([2018]3011)
- China State Railway Group Co., Ltd. [P2019G038]
- China Railway First Survey and Design Institute Group Co., Ltd. [2021RJ06, 19-21-1]
This study proposes a novel Global Direct Search (GDS) method for accurately detecting contact between arbitrarily shaped convex polyhedral blocks. Compared to the commonly used Common Plane (CP) and GJK algorithms, the GDS method is not affected by false contacts and vanishing contacts, and has higher accuracy and robustness.
High-fidelity contact detection between arbitrarily shaped convex polyhedral blocks is an important problem. The common plane (CP) and GJK algorithms are fast but still have some drawbacks in identifying accurate contact points and planes. The Direct Search (DS) method can ascertain the contact points and planes accurately but is limited by its locality assumption. To be specific, irregular blocks with small angles or small edges can cause false contacts, and large penetration will induce vanishing contacts, which will destroy the simulation using the DS method. In this study, a novel Global Direct Search (GDS) method is proposed to search for meta (vertex-face or cross edge-edge in 3D) contacts globally. Without locality assumption, the GDS method can accurately detect contacts between arbitrarily shaped convex polyhedral blocks without suffering from false and vanishing contacts. The new method inherits the global search idea of Contact Theory. Several case studies are used to verify the method and show that the GDS successfully avoids false and vanishing contacts, as well as demonstrate its accuracy, robustness, and improved efficiency.
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