中文摘要：

为了研究循环剪切作用对砂土与土工格栅界面剪切特性的影响,采用单调直剪试验与循环剪切后单调直剪试验,研究了竖向应力、循环剪切位移幅值等因素对筋土界面剪切强度和剪切体变特性的影响,并对比分析了单调直剪试验和循环剪切后单调直剪试验的结果。结果表明：在一定的循环剪切位移幅值内,界面剪应力峰值随着剪切幅值的增加而增长;循环剪切作用使得筋土界面的似粘聚力和摩擦角有一定程度的提高;循环剪切后单调直剪试验所得界面峰值剪切强度和残余剪切强度明显高于单调直剪试验结果。

英文摘要：

A series of cyclic shear tests and monotonic direct shear tests were performed to investigate the interface behavior of sand against geogrid.The effects of vertical stress and shear amplitude on shear strength and shear behavior of sand-geogrid interface were investigated under cyclic loading conditions.The results from monotonic direct shear tests,cyclic shear tests and post-cyclic shear tests were compared for analysis.The results show that the interface peak shear stress increases with the increase of the cyclic shear amplitude in a certain range.The interface cohesion and friction angle increase due to cyclic shear load.The post-cyclic peak shear strength and residual shear strength of the direct shear test are higher than those of monotonic direct shear test.