颗粒堆准静态崩塌及慢速流动过程中的堆结构研究  

Inner structure of granular pile during its quasi-static avalanches and slow fows

作　　者：潘北诚[1] 史庆藩[1] 孙刚[2] 

机构地区：[1]北京理工大学,物理学院,北京100081 [2]软物质物理重点实验室,北京凝聚态物理国家实验室,中国科学院物理研究所,北京100190

出　　处：《物理学报》2014年第1期248-254,共7页Acta Physica Sinica

基　　金：国家重点基础研究发展计划(批准号:2009CB930800);国家自然科学基金面上项目(批准号:10975014和11274355)资助的课题~~

摘　　要：运用自行设计的实验装置并结合颗粒跟踪与成像技术,系统地研究了不同堆积程度的颗粒堆在准静态崩塌过程中的滑移行为.实验发现在颗粒堆中一部分颗粒沿着斜下方向滑动,而另一部分颗粒则几乎没有滑动.精确的数据分析还表明颗粒堆的滑动部分具有明显的层状结构特征,在每一滑动层中颗粒的滑移量基本相同,且各滑动层之间近似相互平行.这些滑动层与水平面的夹角约在40—50之间,与静态层表面与水平面的夹角一致.各滑动层中颗粒的滑移量随其距静态层表面的距离而线性的增加.不同堆积程度的颗粒堆的静态部分基本上不随堆积体积而改变.Dynamical behaviors of granular piles are systemically investigated by an experimental equipment and imaging and direct particle tracking during quasi-static avalanches and slow fow process.It is found that part of beads slides obliquely downward,meanwhile the other part of beads is almost fxed;layer-structure can be clearly observed,and it include fow-layers and static-layer.The fow-layers lie almost parallel to each other and the angles between the fow-layers and horizonal plane are approximately in the range 40 —50.Moreover,the slippage of the fow-layers from the static-layer begins to gradually increase linearly.In addition,the positions of initial fow-layer that has diferent volumes of granular piles tend to be fxed.

关 键 词：颗粒流 崩塌 准静态 层状结构 

分 类 号：O35[理学—流体力学]