NUMERICAL MODELLING OF ROCK FALL USING EXTENDED DDA
NUMERICAL MODELLING OF ROCK FALL USING EXTENDED DDA
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发表时间：
2003
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通讯作者：
ChenGuangqi
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作者：
ChenGuangqi
合理设计防护结构以减轻落石的危害有赖于对落石运动行为的了解，如落石的路径、速度、跳跃高度和距离。数值模拟是获得此类知识的有效途径。本文将非连续变形分析(DDA)应用于落石分析。为了获得更可靠的结果，本文将非连续变形分析(DDA)应用于落石分析中。对原DDA进行了以下改进和扩展：(1)解决了由于刚体旋转误差引起的块体膨胀问题。(2)增加了空气和植物阻力的模拟功能，使模拟得到的落石速度与现场实验得到的速度足够吻合。(3)增加了考虑块体碰撞造成的能量损失的功能，使模拟得到的跳跃高度和跳跃距离与实验结果吻合得很好，即使在坡面很松软的情况下也是如此。给出了一个应用实例，说明了该方法的有效性扩展DDA在落石分析中是非常有效和有用的。因此，该方法可望在边坡稳定性分析中得到广泛应用。
The reasonable design of protective structures to mitigate the hazards from rock fall depends on the knowledge of motion behaviors of falling stones,such as the falling paths,velocities,jump heights and distances.Numerical simulation is an effective way to gain such kind of knowledge,In this paper,the discontinuous deformation analysis (DDA) is applied to rock fall analysis.In order to obtain more reliable results,the following improvements and extensions are made on the original DDA.(1)Solve the problem of block expansions due to rigid body rotation error.(2) Add the function of modeling the drag resistance from air and plants so that the velocities of falling stones obtained by simulations are good enough in agreement with those by experiments in situ.(3)Add the capability to consider energy loss due to block collisions so that the jumping heights and distances obtained by simulations are good enough in agreement with thos by experiments even for the slope with very soft layer on its surface.One of application examples is presented to show that the extended DDA is very effective and useful in rock fall analysis.Therefore,the presented method is expected to be put into wide use in slop stability analysis.