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为研究密实度不同时格栅–砂土界面在经历循环剪切及其后的表现,采用大型直剪仪进行了一系列大型单调直剪试验、循环直剪试验和循环后单调直剪试验。并将单调直剪试验与循环后单调直剪试验的结果进行对比分析。结果表明:单调直剪试验中,随着砂土密实度的增加筋土界面抗剪强度增加,剪切体胀现象变的明显;格栅–密砂界面发生循环剪切软化现象,土样在循环剪切过程当中整体上发生剪缩,且砂土密实度越大经历相同循环次数时的剪缩量越小;循环后单调直剪试验中,3种砂土密实度界面抗剪强度发展曲线都为软化型,在直剪过程中都发生自始至终的剪胀;遭受循环剪切后密砂–格栅界面抗剪强度发生了退化。
In order to study the different density of grille-sand interface undergoing cyclic shear and its subsequent performance, a series of large-scale monotonic direct shear tests, cyclic direct shear tests and monotonous direct shear tests were carried out using a large direct shear instrument. The results of monotonic direct shear test and monotonic direct shear test after cyclic test were compared and analyzed. The results show that in the monotonic direct shear test, the shear strength at the interface of soil and reinforcement increases with the increase of sand density, and the phenomenon of shear body expansion becomes obvious. The cyclic shear softening occurs at the interface of grid and sand, During the cyclic shear process, shear shrinkage occurred on the whole, and the greater the density of sand was, the smaller the shear shrinkage was when the same cycle number was reached. In the monotonous direct shear test after cycling, the shear strength curves of the three kinds of sand- All of them are softening type, dilating all the way in the process of direct shear. The shear strength of the sand-grille interface degenerated after cyclic shear.