论文部分内容阅读
为研究颗粒粒径对格栅-粗粒土界面单调直剪和循环剪切特性的影响,利用大型直剪仪进行了一系列室内大型单调直剪试验、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了对比分析,研究了循环剪切应力历史对界面直剪强度特性的影响。结果表明:单调直剪试验中,随着粗粒土粒径的增加,界面似黏聚力和内摩擦角增加;循环剪切中界面抗剪强度发生硬化,同一循环位移幅值下颗粒粒径越小,界面在循环剪切过程中的硬化速度越快;遭受循环剪切后界面残余应力比降低,峰值似黏聚力显著增长。
In order to study the effect of particle size on the monotonous direct shear and cyclic shear properties at the interface between grill and coarse grained soil, a series of large-scale direct shear tests in room were carried out with a large direct shear tester. The results of monotonic direct shear test and monotonic direct shear test after cyclic test were compared and analyzed. The influence of the history of cyclic shear stress on the shear strength of interface was studied. The results show that in the monotonic direct shear test, the interfacial cohesion and internal friction angle increase with the increase of the particle size of the coarse grained soil. The interfacial shear strength in the cyclic shear hardens, and the particle size at the same cyclic displacement amplitude The smaller the interface, the faster the interface is hardened during cyclic shear; the lower the residual stress ratio of the interface after cycling shear is, and the peak cohesion increases significantly.