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.
出处
《兰州大学学报（自然科学版）》
CAS
CSCD
北大核心
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
关键词
颗粒介质
应力链
拱效应
谷仓效应
抗拔摩擦力
granular material
stress chain
arching effect
granary effect
resistant-drawn force
