堆石体柱状试件成型过程的材料点法仿真  

Simulation of cylindrical stone pile based on the material point method

作　　者：王津龙[1] 刘天云[1] 张楚汉[1] 

机构地区：[1]清华大学水利水电工程系,北京100084

出　　处：《清华大学学报（自然科学版）》2005年第12期1604-1607,共4页Journal of Tsinghua University(Science and Technology)

基　　金：国家自然科学基金资助项目(10302014)

摘　　要：为探索散体工程材料的力学特性,采用数值仿真技术模拟了柱状堆石体试件的成型过程。采用了材料点法作为仿真计算模型。在仿真分析中,堆石体颗粒用随机生成方法构造,具有随机形状且符合级配要求,并用材料点离散描述。数值仿真与实验室中实际堆石体成型过程相同,颗粒分批在重力作用下落入成型桶中,在阻尼措施作用下能量耗散,形成具有一定密实度的试样。该模拟再现了试件成型过程中颗粒之间的相互作用,包括挤压、滑移、分离等现象。该方法可用于深入研究散体材料特性。The modeling process of a cylindrical stone pile were numerically simulated to analyze the mechanical properties of granular materials. The material point method was used as the principal computing model. The stone grains in the pile were treated as randomly generated blocks with stochastic shapes and the required size grade. All the grains were then assumed to be grouped at the material points. The simulation procedure was same to the real procedure in the laboratory, in which, batches of stone grains fell into the modeling barrel, with appropriate energy dissipation, and formed a cylinder. The model included all types of interactions between grains including impact, slip and separation. The numerical results show that the method can be used to analyze the properties of granular materials.

关 键 词：散体材料 材料点法 堆石体 三轴实验 仿真 

分 类 号：O347.7[理学—固体力学] TV41[理学—力学]