考虑颗粒形状的面板堆石坝振动台模型试验DEM模拟

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摘要提出了一种复杂形状颗粒的DEM模拟方法，实现了包括凹多边形在内的复杂形状颗粒的模拟，通过参数控制使得生成的颗粒形状更加真实，模拟了面板堆石坝振动台模型试验，从细观角度揭示了面板堆石坝动力特性。计算结果表明，在地震作用下面板与底板容易滑动，随着峰值加速度的增大，下游坝坡颗粒滑移面角度变大，坝顶沉降和坝体断面剪胀加剧；震前坝体强力链法向接触力主轴方向接近于竖直方向，震后向下游偏转；随着峰值加速度的增大，法向接触力各向异性程度逐渐增强；在相同初始组构条件下面板堆石坝激发的摩擦激励是一定的，与加载条件无关。

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	井向阳1
	杨利福2
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	马刚3
	周伟3

关键词 ：离散元法, 颗粒形状, 面板堆石坝, 振动台试验

Abstract：Using the finite element mesh generation method, a method of modeling convex or concave polygonal particles was proposed.Particles with more realistic shapes were generated by the control of parameters, and simulations of complex shaped particles including concave polygons were realized.DEM simulations of shaking table model test for concrete faced rock-fill dam (CFRD) in irregularly shaped grain were presented in this work and the dynamic characteristic were revealed from perspective of micro mechanics.The study results indicated that the concrete face slides from the base during earthquake.As the peak acceleration increasing, the dip angles of sliding plane for the grains in the downstream of CFRD increase and the crest settlement and skeleton dilatation become more intense.The major principal direction of normal contact forces was closed to the vertical before earthquake while the angle shifts to the downstream after earthquake.The anisotropy of normal contact forces increases with peak acceleration.Under the same initial fabrics, the average friction mobilization for CFRD was unvaried and irrelevant to the acceleration input.

Key words： discrete element method particle shape concrete faced rock-fill dam shaking table test

收稿日期: 2017-06-19 出版日期: 2018-12-15

引用本文:

井向阳1，杨利福2,3，马刚3，周伟3. 考虑颗粒形状的面板堆石坝振动台模型试验DEM模拟[J]. 振动与冲击, 2018, 37(24): 99-105.
JING Xiangyang1，YANG Lifu2,3，MA Gang3，ZHOU Wei3. DEM modeling of shaking table model test for CFRD considering particle shape. JOURNAL OF VIBRATION AND SHOCK, 2018, 37(24): 99-105.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2018/V37/I24/99

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