筒型基础静压沉贯过程颗粒流模拟数值分析

Numerical Analysis of Particle Flow Simulation in the Process of Static Pressure of Bucket Foundation

筒型基础的安装过程是施工中的关键环节,是决定安装成败的关键所在.针对沉贯过程中土体变形较大的特点采用颗粒流软件建立筒型基础动态沉贯安装模型,分析了安装过程中土体位移场、孔隙率、土体应力状态等因素的变化特征,以土体位移及颗粒间接触力链变化为依据,分析了形成土拱效应的细观机理.结果表明:筒体沉贯过程中形成的土塞效应有助于土拱的形成,同时土拱效应的产生导致土体应力状态发生变化,最终宏观表现为沉贯阻力异常增大.

Penetration installation is a key step in the construction process of the bucket foundation.Whether the penetration can be successfully in place is a key issue affecting the basic application of the bucket foundation.According to the characteristics of large deformation of soil in the process of penetration,a model of static pressure penetration installation of bucket foundation is established by using particle flow software.The characteristics of displacement field,porosity and stress state of soil in the process of installation are analyzed.Based on the displacement of soil and the change of indirect contact force chain of particles,the micro mechanism of soil arching effect is analyzed.The results show that the soil plug effect is helpful to the formation of the soil arch,and the soil arch effect results in the change of the soil stress state,and the final macro performance is that the penetration resistance increases abnormally.