中文摘要：

为了研究筋土界面之间复杂的相互作用机制,通过室内拉拔模型试验,研究不同横肋间距条件下高密度聚乙烯单向拉伸土工格栅的筋土界面作用特性,分析横肋间距和法向应力对筋土界面拉拔力的影响。结果表明：随着土工格栅横肋间距的增大,筋土界面的最大拉拔力和达到最大拉拔力所需的拉拔位移逐渐减小,且黏聚力和摩擦角也呈减小的趋势;当土工格栅横肋间距较小时拉拔曲线呈现出应变硬化的特征,随着横肋间距的增加,拉拔曲线由应变硬化向应变软化转化;当土工格栅的横肋间距一定时,筋土界面的最大拉拔力随着施加法向应力的增加而逐渐增大;筋土界面的摩擦系数随横肋间距和法向应力的增加而逐渐减小;横肋端承阻力在拉拔力中起着主导作用,且在高应力作用下横肋加筋的效果更为显著,横肋端承阻力对筋土界面最大拉拔力的贡献接近占90%。

英文摘要：

To study the complicated mechanism of the interaction between reinforcement and soil,the laboratory pull-out tests of HDPE uniaxial tensile geogrid with different transverse rib spacing were performed to investigate the interaction characteristics between reinforcement and soil.The effects of transverse rib spacing and normal stress on the pull-out force at the interface between reinforcement and soil were analyzed.Results show that with the increase of transverse rib spacing,the maximum pull-out force at the interface between reinforcement and soil as well as the needed pull-out displacement for the maximum pullout force decrease gradually.Both the cohesion and internal friction angle also assume a decreasing trend.When the transverse rib spacing of geogrid is smaller,the pull-out curve shows the characteristics of strain hardening.With the increase of transverse rib spacing,it transforms from strain hardening to strain softening.When the transverse rib spacing of geogrid is fixed,the maximum pull-out force at the interface between reinforcement and soil increases gradually with the increase of applied normal stress.The friction coefficient of the interface between reinforcement and soil decreases gradually with the increase of transverse rib spacing and normal stress.The end bearing resistance of transverse rib plays a dominant role in pull-out force.Under the action of high stress,the effect of transverse rib reinforcement is more significant.The end bearing resistance of transverse rib contributes nearly 90%to the maximum pull-out force at the interface between reinforcement and soil.