筒装颗粒介质中桩体的抗拔摩擦力  

Resistant-drawn force of a pile imbedded in granular material within a barrel

作　　者：马崇武[1] 慕青松[2] 马君伟[2] 王卫平[1] 

机构地区：[1]东莞理工学院建筑工程系,广东东莞523808 [2]兰州大学土木工程与力学学院,甘肃兰州730000

出　　处：《兰州大学学报（自然科学版）》2008年第1期96-101,共6页Journal of Lanzhou University(Natural Sciences)

基　　金：国家自然科学青年基金(10402012);东莞市科研发展专项基金(2005D046)资助

摘　　要：通过分析颗粒介质中应力链网状结构的形成过程与传力特性,在Janssen模型的基础上给出了计算筒装颗粒介质中桩体抗拔摩擦力的理论公式.该公式能够反映出桩体侧面所受颗粒介质的摩擦力随深度增大逐渐趋于一极限饱和值,这一现象属于经典的颗粒介质"谷仓效应"范畴.由该公式给出的简装颗粒介质中桩体的抗拔摩擦力随相对桩径(桩径与筒的内径之比)及桩体埋深的变化规律,与实验数据定性符合.Based on an analysis of the formation process and force-transmission characteristics of stress-chain network in granular materials, and improved from Janssen＇s model, we present a new model for calculating the resistant-drawn force of a pile imbedded in granular materials within a barrel. The new model shows that the frictional stress exerted on the pile side by granular materials gradually tends towards a saturated limit value with increasing imbedded height, which also belongs to the phenomenon of classical granary effect. And the relationships between the resistant-drawn force and the imbedded height for different pile-diameters calculated from the new theoretic model agree well with the test data.

关 键 词：颗粒介质 应力链 拱效应 谷仓效应 抗拔摩擦力 

分 类 号：O313.5[理学—一般力学与力学基础] O347.7[理学—力学]