Simulation of Rock Slope Failure with Three-Dimensional Discontinuous Deformation Analysis (3D DDA)
Simulation of Rock Slope Failure with Three-Dimensional Discontinuous Deformation Analysis (3D DDA)
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DOI：
10.2472/jsms.52.488
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发表时间：
2003
期刊：
影响因子：
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通讯作者：
Jian-Hong Wu;Y. Ohnishi;Keiichi Momma;S. Nishiyama
中科院分区：
文献类型：
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作者：
Jian-Hong Wu;Y. Ohnishi;Keiichi Momma;S. Nishiyama
本文讨论了三维非连续变形分析（3DDDA）的基本原理及其在模拟岩质边坡破坏问题中的应用。DDA属于非连续数值分析方法之一，在块体相互接触时产生接触力，需要进行接触判断和接触力计算。结果表明，一个正常的接触弹簧被用来计算正常的接触力，以防止在接触过程中相互穿透块。然而，当块离开时，正常的接触弹簧被删除。此外，沿沿着不连续面的破坏可以很容易地用莫尔-库仑破坏准则来模拟。3D DDA中的适当接触弹簧布置遵循“无穿透和无张力”的标准，以在接触期间获得正确的接触力。新方法已成功地应用于模拟在日本Amatoribashi-nishi网站的岩石边坡倾倒。仿真结果与现场视频图像吻合较好。我们相信，该模拟方法对研究此类事件的机理和过程具有重要的意义，为今后此类事件的研究提供了有用的知识
In this paper, both the theory of Three-Dimensional Discontinuous Deformation Analysis (3D DDA), and its application to simulate rock slope failure problems are discussed. DDA belongs to one of the discontinuous numerical analysis methods, and the contact judgment and contact force computation should be concerned to produce contact forces when blocks contact to each other. It is shown that a normal contact spring is employed to calculate the normal contact forces to prevent blocks from penetrating to each other during contacts. However, the normal contact spring is deleted when blocks are leaving. In addition, the failure along discontinuous surfaces can be simulated easily by applying the Mohr-Coulomb failure criterion. The appropriate contact spring arrangement in 3D DDA follows the criterion of "No-penetration and No-Tension" to obtain correct contact forces during contacts. The new approach has been successfully applied to simulate a rock slope toppling at Amatoribashi-nishi site in Japan. The simulation results are quite in agreement with the video pictures obtained from the field. We believe that the simulation is very helpful on investigation of the failure mechanism and process, which can provide useful knowledge for study such events in future