摘要
颗粒堆积是地质工程中较为普遍的现象,而其堆积稳定后的安息角可以在一定程度上反映颗粒堆积的基本特征.用DEM方法研究不同密度分布的颗粒堆积过程及堆积结果,有助于我们在细观层面研究颗粒密度对颗粒堆积结果的影响和验证DEM方法分析颗粒堆积的合理性.本研究用圆形颗粒简化模拟散体颗粒:第一步,用EDEM软件建立相关模型,在模型内生成简化的颗粒,模拟颗粒在重力作用下自由下落和堆积稳定的过程;第二步,模型中生成颗粒下落堆积稳定后,保留模型底部边界,数值模拟研究移除模型上部边界后颗粒散落堆积稳定的过程并测定堆积体的安息角;第三步,对应数值模型,做相关的实验进行对比验证.研究结果表明:在只考虑堆积颗粒密度而忽略其他参数影响的条件下,堆积颗粒材料的密度越小,其堆积稳定后的安息角越大.
Particle accumulation is a common phenomenon in geological engineering, and its stable repose angle can reflect the basic feature of particle accumulation to a certain extent. The DEM method is used to study the accumulation process of particles with different density distributions, which can help us to study the effect of particle density on the particle accumulation results and verify the rationality of particle accumulation simulations by DEM method. This study uses circular particles to simplify the simulation of granular particles. The first step is to establish the relevant model with EDEM software and to generate simplified particles in the model. It simulates the process of free falling and accumulation stability of particles under gravity. In the second step, after the particle falling and accumulation are stabilized, the bottom boundary of the model is retained, and the upper boundary of the model is removed. The repose angle of the accumulation body is then measured. The third step is to conduct relevant experimental tests to compare with the numerical model for verification purpose. The results show that the smaller the density of the deposited granular material is, the larger the resting angle is after the accumulation is stable, when considering the effect of the density of particles and neglecting the influence of other parameters.
出处
《力学季刊》
CSCD
北大核心
2017年第4期734-740,共7页
Chinese Quarterly of Mechanics
基金
国家自然科学基金(51479087)
水沙科学与水利水电工程国家重点实验室开放研究基金(sklhse-2016-C-05)
青海大学中青年科研基金(2017-QGY-7)
关键词
颗粒堆积
安息角
离散元法
材料密度
particle accumulation
repose angle
discrete element method
material density
