[关键词]
[摘要]
采用离散元方法生成由一定粒径范围小颗粒组成的等粒径颗粒团, 颗粒之间定义为平行胶结方式。通过模拟 圆形颗粒团在两种不同排列方式下的双轴压缩试验, 研究了不同侧向应力下颗粒破碎的过程、剪切带的形成与发展 等。结果表明: 低侧向应力下, 试样颗粒先滑移转动、后破碎, 致密排列下, 出现剪胀现象; 高侧向应力下, 试样两端 颗粒有少量滑移、转动, 然后发生破碎, 并向试样中部发展, 形成剪切带。
[Key word]
[Abstract]
The discrete element method w as employ ed to generate the cluster of par ticles with equal size, w hich wer e composed of the part icles of smaller sizes. T he part icles wer e bo nded to gether in t he fo rm of par allel bonding . T he biax ial compression tests wer e per formed for the rounded cluster of particles under two differ ent arr ang ement patterns to inv estigate the particle breakag e pr ocesses and the formatio n and development of shear band under different latera l stresses. The results show ed that the sample par ticles first slip and rot at e and then crush w hen the lateral str ess is low, and dilatio n and lat eral ex trusion occur for the dense arr ang ement o f particles; and the particles near bo th ends o f the sample fir st slide and rotat e slightly and then break up w hen the later al stress is hig h, and pro pag ate to the middle of the sample to fo rm the shear band event ually .
[中图分类号]
[基金项目]
国家自然科学基金项目( 91215301)