New Geometric Restriction for the Displacement–Constraint Points in Discontinuous Deformation Analysis

AbstractA displacement-based seismic discontinuous deformation analysis (DDA) considers the influence of an earthquake by applying a time-dependent displacement constraint to simulate time-dependent ground movement of the base rock. However, unexpected variations of the base block stress and the blo...

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Bibliographic Details
Published in:International journal of geomechanics 2017-05, Vol.17 (5)
Main Authors: Wu, Jian-Hong, Do, Trong Nhan, Chen, Chun-Hua, Wang, Gonghui
Format: Article
Language:English
Subjects:
Computer simulation
Constrictions
Discontinuity
Displacement
Ground movements
Rock
Technical Papers
Three dimensional motion
Time dependence
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Summary:AbstractA displacement-based seismic discontinuous deformation analysis (DDA) considers the influence of an earthquake by applying a time-dependent displacement constraint to simulate time-dependent ground movement of the base rock. However, unexpected variations of the base block stress and the block area in a seismic DDA may affect the block contacts with another block. This study theoretically clarifies the mechanism that causes unwanted base block distortion in a seismic DDA. A new geometric restriction is proposed for the assignment of displacement–constraint points to simulate the ground movement of two-dimensional (2D) and three-dimensional (3D) convex and concave blocks without changing the DDA algorithm. Additionally, the Daguangbao rock avalanche triggered by the Wenchuan earthquake in China is considered as a case study to demonstrate the capability of the new geometric restriction in a DDA to solve practical problems.
ISSN:1532-3641
1943-5622
DOI:10.1061/(ASCE)GM.1943-5622.0000648