Journal
COMPUTERS AND GEOTECHNICS
Volume 130, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compgeo.2020.103932
Keywords
Discontinuous deformation analysis (DDA); Friction force; Augmented open-close iteration (AOCI); Rockslide
Categories
Funding
- China Scholarship Council (CSC)
- National Natural Science Foundation of China [41902275, 41130751]
- Special Fund for Basic Research on Scientific Instruments of the National Natural Science Foundation of China [4182780021]
- Shanghai Sailing Program [18YF1424400]
- Taihang mountain highway Program by China Power Construction Hebei Transportation Expressway investment Development Co., Ltd. [kh0023020184285]
- Guizhou reverence high speed double track Program by Guizhou Highway Engineering Group Co., LTD. [201813011]
- Fundamental Research Funds for the Central Universities [22120180006]
- Emeishanhanyuan highway Program by Sichuan Lehan Expressway Co., Ltd.
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This study introduces an augmented open-close iteration (AOCI) algorithm to improve upon the shortcomings of the traditional open-close iteration method. AOCI enhances contact state transition modeling and provides a control mechanism for improving shear forces and shear movement direction during iteration. The performance of AOCI is demonstrated to be superior to the traditional approach in both static and dynamic test cases.
In applying discrete numerical methods to model large-displacement problems, such as rockslides, accurate contact force calculation requires correct representation of the evolving contact status. In the discontinuous deformation analysis (DDA), open-close iteration (OCI) serves the crucial role of ascertaining that contact status is properly updated throughout an assembly of discrete blocky elements. OCI is a simple, straightforward and intuitive procedure but has shortcomings that affect analysis accuracy. Alternatives are generally computationally involved and have other issues, and OCI with its large installed base can still be one of the most desirable ways to track contact state with proper improvements. This is exactly this study aims to achieve. This study proposes an augmented open-close iteration (AOCI) algorithm that amends the shortcomings of OCI through: (1) it enhances the modeling of transition between contact states; (2) it provides the control mechanism for improving shear forces and shear movement direction also during OCI iteration. The AOCI is easy to add to the existing structure of OCI. The improved performance of AOCI over the traditional approach is demonstrated using both static and dynamic test cases.
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