A new contact potential based three-dimensional discontinuous deformation analysis method

The three-dimensional discontinuous deformation analysis (3D-DDA) method was developed for the deformation simulation of rock block system cut by the natural discontinuities in rock mass engineering. In the conventional DDA, open-close iteration is used to deal with the contact constraints, which ne...

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Bibliographic Details
Published inInternational journal of rock mechanics and mining sciences (Oxford, England : 1997) Vol. 127; p. 104206
Main Authors Xu, Dongdong, Wu, Aiqing, Yang, Yongtao, Lu, Bo, Liu, Feng, Zheng, Hong
Format Journal Article
LanguageEnglish
Published Berlin Elsevier Ltd 01.03.2020
Elsevier BV
Subjects
Computer applications
Computer simulation
Contact potential
Contact potentials
Deformation
Deformation analysis
Discontinuity
Equilibrium equations
FEM-DEM
Iterative methods
Potential contact force
Rock masses
Rock mechanics
Rocks
Three dimensional analysis
Three-dimensional discontinuous deformation analysis
Contact potential
FEM-DEM
Three-dimensional discontinuous deformation analysis
Potential contact force
Rock mechanics
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Summary:The three-dimensional discontinuous deformation analysis (3D-DDA) method was developed for the deformation simulation of rock block system cut by the natural discontinuities in rock mass engineering. In the conventional DDA, open-close iteration is used to deal with the contact constraints, which needs to apply or remove the normal or tangential springs repeatedly to meet the equilibrium equations at each time step. DDA provides a time step adjustment strategy to meet the fast convergence of open-close iterations, but when solving large-scale problems, the adjusted time step often reaches a very small order of magnitude, which makes the calculation time-consuming increase sharply. In the framework of the original 3D-DDA, a new contact potential based three-dimensional discontinuous deformation analysis method (3D-CPDDA) is developed. The proposed method not only retains the advantage of the original DDA method in defining local displacement functions on a single patch, but also integrates the simplicity and rapidity of potential based contact processing. The improved method is easier to be implemented in the parallel way, which can further improve the computational efficiency. Numerical examples have confirmed the correctness and feasibility of the proposed procedure.
ISSN:1365-1609
1873-4545
DOI:10.1016/j.ijrmms.2019.104206