集中力作用下球形颗粒六角密排堆积体的传力研究  

Force transmission in three-dimensional hexagonal-close-packed granular arrays submitted to a point load

作　　者：苗天德[1] 宜晨虹[1] 齐艳丽[1] 慕青松[1] 刘源[1] 

机构地区：[1]兰州大学土木工程与力学学院,兰州730000

出　　处：《物理学报》2007年第8期4713-4721,共9页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:10172041);国家自然科学青年基金(批准号:10402012)资助的课题.~~

摘　　要：采用铝塑板技术和复写纸技术相结合,当球形颗粒堆积体在不同的六角密排情况下受集中力作用时,对堆积体底面力的分布情况进行了定量的实验研究.结果表明:在所有排列情形下都存在明显的拱效应,且在堆积体的每一水平层面上力的分布都具有120°对称性.证实了颗粒排列形式对力的传递有很大影响.发现在纯六角密排排列时,底部颗粒的受力最为平均,单个颗粒受力的最大值在所有排列中为最小.还发现了非主力链的“聚焦”现象.对实验结果做出了理论解释.In this article, the aluminium-plastic board and carbon paper technique are combined to investigate the contact force at bottom boundary of three-dimensional ordered granular arrays in response to a point load. Arching effects were observed with all arrays, and the force distribution markedly depends on the crystal structure and has a 120°-symmetry at every layer of the crystals, while the heterogeneity in force distribution in the pure hcp arrays is minimal of all the arrays. Non-main force chains were observed to have the “focalization” phenomena. These results can be explained by a force-transmission model.

关 键 词：颗粒介质 六角密排 力链 

分 类 号：O359[理学—流体力学]