加筋土地基模型试验边界效应与承载性能分析

为进一步探讨边界效应对加筋土地基的影响,基于室内方形基础下加筋土地基大模型试验,采用ABAQUS有限元软件建立加筋土地基数值模型,主要分析了模型宽度L和加载板宽度B对加筋土地基承载性能、地基内部土体应力应变及筋材变形的影响.结果表明:无筋地基与加筋土地基极限承载力均随L/B的减小而增大,当L/B＞5时,可忽略边界效应对...

Analysis of boundary effect and bearing capacity for reinforced soil model test

Based on large-scale reinforced soil model tests under indoor square foundations,the ABAQUS finite element software is used to establish a numerical model of reinforced foundations,and the boundary effects on reinforced foundations are further explored.The effects of the model width L and the loading plate width Bon the bearing capacity of the reinforced foundation,the internal soil stress and strain and the deformation of the reinforcement are analyzed.The results show that the geogrid reinforcement can significantly improve the uneven settlement and height of the foundation soil.As the distance from the loading plate to the model increases,the ultimate bearing capacity of both reinforced foundation and unreinforced foundation increases.When L/Bis greater than 5,the boundary effect hardly influences the reinforced foundation;While when L/Bis less than 2.67,it will influence the reinforced foundation significantly.When L/Bis greater than 4,the boundary effect hardly influences the unreinforced foundation.The vertical stress distribution area increases with the increase of the loading plate width B.The affected width of the reinforced foundation under vertical load is 5B,and the affected depth is 2.57B~4B.When L/Bis greater than 5,the soil deformation,stress distribution and grid deformation curves are basically coincident,and the boundary effect on the reinforced foundation can be neglected.