Numerical Simulation in Rockfall Analysis: A Close Comparison of 2-D and 3-D DDA

作者：Chen, Guangqi; Zheng, Lu^*; Zhang, Yingbin; Wu, Jian

来源：Rock Mechanics and Rock Engineering, 2013, 46(3): 527-541.

DOI：10.1007/s00603-012-0360-9

• Rockfall
• Numerical simulation
• 2-D DDA
• 3-D DDA
• Trajectory
• Motion behaviors

Accurate estimation of rockfall trajectory and motion behaviors is essential for rockfall risk assessment and the design and performance evaluation of preventive structures. Numerical simulation using discontinuous deformation analysis (DDA) is effective and helpful in rockfall analysis. Up to now, there have been many reports on application of two-dimensional (2-D) DDA programs. In this paper, the major advantages of rockfall analysis using 2-D and extensions to three-dimensional (3-D) analysis are presented. A practical 3-D DDA code is demonstrated to be capable of simulating free falling, rolling, sliding, and bouncing with high accuracy. Because rockfall trajectories and motion behaviors can be described as combinations of these four types, this demonstration indicates that the implemented code is capable of providing reliable rockfall analysis. Finally, specific tests are conducted to compare 2-D and 3-D DDA rockfall analysis in predicting trajectory and dynamic behavior. The results indicate that 3-D DDA simulations are more appropriate for rough tree-laden inclined slopes in providing detailed spatial distribution, whereas 2-D DDA simulations have better efficiency for slopes dominated by valleys and ravines. These results can help in selecting the appropriate DDA simulation for rockfall analysis.

• 出版日期2013-5
• 单位中国地震局地震预测研究所