Study of Pullout Tests on Plastic Geogrids with Vertical Stiffener Ribs of Aluminum Angles
To improve the interfacal strength between ordinary plastic geogrids and fillers,a new type of three-dimensional reinforcement materials—plastic geogrids with vertical ribs of aluminum angles was con-structed by fixing aluminum angles as vertical stiffener ribs on the top of the transverse ribs of plastic geo-grids.The pullout resistance characteristics and their parameter features of plastic geogrids with vertical stiffener ribs of aluminum angles in sandy fillers were explored by indoor pullout tests in different combined working cases.The results indicated that:1)the pullout curves had an obvious peak value in the stage of lower normal compressive stress,which were characterized by strain softening within the observed range;2)with the increase in normal compressive stress,the ultimate pullout resistance of plastic geogrids with vertical stiffener ribs of aluminum angles increased obviously.Under the same normal stress,the ultimate pullout resistance was approximately linearly and positively correlated with the height of the vertical stiffener ribs of aluminum angles.3)The reinforcement effect coefficient,interface shear strength parameter,fric-tion-like coefficient,and pullout coefficient of plastic geogrids with vertical ribs of aluminum angles in-creased with the increase in the height of the vertical stiffener ribs of aluminum angles,which indicated that three-dimensional reinforcement materials with vertical stiffener ribs of aluminum angles could effectively im-prove the pullout rasistance strength of the reinforced soil complex,and had positive significance for impro-ving the stability of soil.
road engineeringreinforced soilpullout testplastic geogrid with vertical stiffener rib of alu-minum angles
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