【摘要】 整体钢塑土工格栅在筋土界面相互作用中具备卓越的加筋摩擦镶嵌咬合性能,因而在加筋土结构中得到了较为广泛的应用。拉拔试验被认为能较好地反映加筋材料在填筑土体中的界面特性。通过钢塑土工格栅在土石混合料中的拉拔试验,测定了钢塑土工格栅与不同土石比例混合填筑料之间的界面摩擦系数、界面似摩擦角,得出当混合填筑料全部为石渣料时,其界面似摩擦系数(界面似摩擦角)最大;天然状态下,界面似摩擦系数为0.81,界面似摩擦角为39.0°;饱和状态下,界面似摩擦系数为0.63,界面似摩擦角为32.2°。分析了上覆压力、含水量及混合填筑料中土石比例对界面摩擦系数、界面似摩擦角的影响程度,得出混合填筑料的界面似摩擦系数、界面似摩擦角均随着上覆垂直荷载的增大而减小;在石渣料含量一定时,随着含水量的增加,界面似摩擦系数(界面似摩擦角)降低;在填料含水量一定时,随着石渣料含量的增大,界面似摩擦系数(界面似摩擦角)相应增大。更多还原

【Abstract】 Overall plastic geogrid in reinforced soil interface interaction highlights the remarkable reinforced friction mosaic bite performance,which has been widely used in reinforced earth structure.Pullout tests are thought to reflect the interface characteristics of reinforced material in landfill soil.Through pull-out test on plastic geogrid in soil rock mixture,interfacial friction coefficient between steel plastic geogrid and the mixture with different proportion of earth is determined.When the filling material is all the ballast materials,the interface coefficient of friction(interface friction angle)is the maximum.Under the natural condition,the interface friction coefficient is 0.81,the interface friction angle is 39°.In the saturated state,the interface friction coefficient is 0.63,the interface friction angle is 32.2°.Analysing the influence of the overburden pressure,rock water content and the proportion of soil to rock in the mixed in filling materials on the interfacial friction coefficient and interfacial friction angle.We conclude that for the mixed filling materials interface coefficient of friction and friction angle of interface decrease with the increase of overlying vertical loads.When the content of slag is certain,along with the increase of water content,the interface coefficient of friction(interface friction angle)decreases;when the water content filling matevials is certain,with the increase of stone slag content,the interface coefficient of friction(interface friction angle)increases.At the same time,two kinds of failure mode and effective thickness of reinforced plastic geogrid are tested and analyzed.更多还原