scholarly journals EARTHQUAKE RESPONSE ANALYSIS FOR ROCK SLOPE USING DISCONTINUOUS DEFORMATION ANALYSIS (DDA)

2009 ◽  
Vol 65 (3) ◽  
pp. 644-662 ◽  
Author(s):  
Tomofumi KOYAMA ◽  
Satoshi AKAO ◽  
Satoshi NISHIYAMA ◽  
Yuzo OHNISHI
Keyword(s):  
Rock Slope ◽  
Discontinuous Deformation Analysis ◽  
Deformation Analysis ◽  
Earthquake Response ◽  
Response Analysis ◽  
Discontinuous Deformation ◽  
Earthquake Response Analysis

Discontinuous Deformation Analysis Visualization System Based on VTK

2013 ◽  
Vol 765-767 ◽  
pp. 542-546
Author(s):  
Yi Nuo Li ◽  
Jun Xiao ◽  
Zhen Ya Shen ◽  
Ying Wang
Keyword(s):  
Rock Slope ◽  
Discontinuous Deformation Analysis ◽  
Rock Slope Stability ◽  
Deformation Analysis ◽  
Graphic User Interface ◽  
Visualization System ◽  
Processing Program ◽  
Visualization Toolkit ◽  
Discontinuous Deformation ◽  
Underground Chamber

Discontinuous Deformation Analysis (DDA) is an emerging numerical simulation technology in rock engineering field, which could be used to analyze discontinuous blocks movement. DDA has been widely used in the areas ranging from rock slope stability analysis, underground chamber constructions to earth quake loading predictions. But so far, there is no pre and post processing program for DDA algorithm. In order to make DDA more effectively meet the needs of practical projects, and analyze the computing results more clearly, effectively and conveniently, in this paper, we use an open source VTK (Visualization Toolkit) system to visualize the results of DDA, design and implement a visualization system. We also developed friendly GUI (Graphic User Interface) based on QT. Finally, we demonstrate this tool with two project examples, which will prove that the visualization system is direct, convenient and easy to extension.

DEVELOPMENT OF COUPLED DISCONTINUOUS DEFORMATION ANALYSIS AND NUMERICAL MANIFOLD METHOD (NMM–DDA)

2010 ◽  
Vol 07 (01) ◽  
pp. 131-150 ◽  
Author(s):  
SHIGERU MIKI ◽  
TAKESHI SASAKI ◽  
TOMOFUMI KOYAMA ◽  
SATOSHI NISHIYAMA ◽  
YOZO OHNISH OHNISHI
Keyword(s):  
Rigid Body ◽  
Slope Failure ◽  
Discontinuous Deformation Analysis ◽  
Deformation Analysis ◽  
Response Analysis ◽  
Numerical Manifold Method ◽  
Body Rotation ◽  
Rigid Body Rotation ◽  
Discontinuous Deformation ◽  
Numerical Manifold

Discontinuous Deformation Analysis (DDA) and Numerical Manifold Method (NMM) have been widely used for the analyses of discontinuous rock masses. Recently, these discontinuum-based numerical methods have been applied to the simulations for slope failure due to earthquakes, where one of the key issues is the estimation of traveling velocities and distances for the collapsed rock blocks. For the dynamic response analysis of rock slopes, it is necessary to consider the local variation of seismic forces, especially when the slope size is large and/or the slope geometry becomes complicated. In DDA, there is difficulty to consider the local displacements and stress condition of the single block for the basement because of mathematical principle (in DDA, the displacement function is defined at the gravity center of the blocks and the strain in the block is uniform). On the other hand, NMM can simulate both continuous and discontinuous deformation of the block systems. However, the rigid body rotation of blocks cannot be treated properly because NMM does not deal with the rigid body rotation in explicit form. According to the above-mentioned features and drawbacks, it is reasonable to combine DDA and NMM from practical point of view. In this paper, the formulation for the coupled NMM and DDA (NMM–DDA) was presented. For the formulation, NMM and DDA can be easily combined by choosing displacements of the DDA blocks and NMM cover nodes as unknowns, because the processes to establish the equilibrium equations (minimizing total potential energy) and kinematics for block system are same between DDA and NMM. In this paper, some applications of the NMM–DDA to both dynamic and static problems were also presented and the validity and applicability of newly developed DDA–MM were discussed.

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