Influence of node strengthening on mechanical properties of aeolian sand-geogrid interface
The geogrid with a three-dimensional reinforcement effect can be formed by attaching the nodes to the biaxial geogrid.Based on the pull-out test of biaxial geogrid-reinforced aeolian sand,a three-dimensional discrete element pull-out model was built.The effects of arrangement,thickness,number and distance between adjacent nodes of strengthened nodes on macro and microscopic mechanical properties of reinforced soil interface were studied.The results show that in the three arrangements of strengthening on the upper side of the node,strengthening on the lower side of the node,and simultaneous strengthening on both the upper and lower sides of the node,the simultaneous thickening on both the upper and lower sides showed the greatest increase in the ultimate pullout resistance and the interfacial friction angle.The reinforced node optimizes the reinforcement performance of the geogrid.When the node arrangement is unchanged,the thickness and number of reinforced node have a good positive linear correlation with the ultimate pullout resistance increment.Compared with the ordinary geogrid,the shear band range of the reinforced node geogrid is larger,and the ability to limit the displacement of soil is stronger.If multiple nodes work at the same time and the spacing of adjacent nodes is small,the influence areas of adjacent nodes overlap each other,which reduces the ultimate pullout resistance increment provided by nodes,resulting in node group effect.As the spacing of adjacent nodes increases,the overlapping range of adjacent nodes decreases,and the group effect gradually weakens.
geogridaeolian sandpull-out teststrengthened nodesdiscrete element
万方数据
维普
