中文摘要：

利用自主研制的大型结构面剪切仪完成了一系列界面直剪试验,探讨在法向循环荷载与静荷载两种条件下土工格栅与石英砂界面的抗剪性能,比较其在两种法向荷载下的异同点。试验结果表明：循环荷载作用下剪应力随剪切位移的发展趋势与静荷载下的有相似之处,但曲线本身表现出了循环发展的特性;循环荷载作用下剪应力峰值和谷值的最大值与法向应力的关系近似符合摩尔-库仑定律;循环剪应力最大值随着法向循环荷载频率的增加而减小,但随着振幅的增加而逐渐增大;循环荷载下筋土界面剪应力随位移而波动,始终处于振幅上下限所对应静荷载下剪应力之间,相关物理量之间具体的定量关系需要进一步研究。

英文摘要：

A series of direct shear tests were performed using self-developed large-scale interface shear apparatus to investigate the shearing resistance properties of sand-geogrid interface and compare the experimental results under normal cyclic load with those under static load.The test results demonstrate that the development trend of shear stress-displacement curves under cyclic load are similar to those under static load;but the shear curves under cyclic load show cyclic development characteristics;the relationships between the maximal shear stress of peak value and normal stress,and the maximal shear stress of trough value and normal stress both conform basically to Mohr-Coulomb rule;the maximal shear strength under cyclic load decreases with the increasing of frequency,but increases with amplitude increasing;the shear strength under cyclic load fluctuates with shear displacement,but is always in between the upper and lower boundaries defined by the shear stress under corresponding static normal stresses;the specific quantitative relationship among these related physical variables needs further researches.