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为研究土工格栅纵横肋与砂土的界面受力特性,进行了不同法向压力的格栅拉拔试验,分别设计了横向与纵向剪除横肋的6种拉拔试验工况,研究横肋减少对格栅受力、拉拔阻力峰值和位移及似摩擦系数的影响,并分别对比了整体剪切和刺入剪切破坏模式下的格栅拉拔阻力,揭示格栅筋土界面的相互作用机理。结果表明,随着横肋的减少,格栅拉拔阻力和似摩擦系数不断地变小;横肋沿横向减少的格栅最大拉拔阻力大于横肋沿纵向减少的最大拉拔阻力,完整横肋有助于筋土界面的加筋作用的充分发挥。理论计算格栅界面摩擦力约为18%-19%的试验拉拔阻力,而试验获得的格栅界面摩擦力与试验拉拔阻力的比值为29%-33%,横肋与土体挤压咬合产生的承载力分量占了总拉拔阻力的67%-71%,横肋极大提高了土工格栅的拉拔阻力。
In order to study the interface force characteristics of longitudinal and transverse ribs and sand of geogrids, the grid pullout tests under different normal pressures were carried out. Six kinds of pullout test conditions of transverse and longitudinal cutout transverse ribs were designed respectively, Reduce the influence on the grid force, the peak resistance and displacement of the gridding drag and the coefficient of friction, and respectively compare the grid drawing resistance under the whole shear and piercing shear failure modes to reveal the interaction Mechanism of action. The results show that with the decrease of transverse ribs, the drawing resistance and friction-like coefficient of the grille become smaller and smaller. The maximum drawing resistance of the grille which decreases along the transverse ribs is larger than that of the transverse ribs. Ribs help to reinforce the effect of the reinforcement of the earth’s surface. Theoretical calculation of the grill interface friction of about 18% -19% of the test pull resistance, and test the grill interface friction and the test pull resistance ratio of 29% -33%, transverse ribs and soil extrusion The bearing capacity generated by occlusion accounted for 67% -71% of the total drawing resistance, transverse ribs greatly improve the resistance of the geogrid drawing.