【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.更多还原

【Abstract】 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.更多还原