作者：张珂¹, 姚小平²

作者单位：1. 河南工业和信息化职业学院，河南 焦作 454000;
2. 河南理工大学，河南 焦作 454000

关键词：筋-土界面;粗粒土;循环剪切特性;直剪试验

摘要：

为研究土工格栅-粗粒土界面动力剪切特性受土粒径与格栅尺寸比（粒孔比d₅₀/L_a）的影响，开展4种粒孔比d₅₀/L_a（0.04、0.08、0.12、0.20）的循环剪切室内模型试验。试验结果表明：不同粒孔比d₅₀/L_a下筋土界面循环剪切滞回曲线呈近似倾斜菱形；筋-土界面剪应力峰值随d₅₀/L_a的增大呈先增后减的变化趋势，当d₅₀/L_a= 0.08时达到最大值；土样最终剪缩量随d₅₀/L_a的增大则逐渐增大。在动力特性方面，筋-土界面剪切刚度随剪切循环周次增加逐渐增大而阻尼比则逐渐减小，且均存在一个最优d₅₀/L_a（分别为0.08和0.2）使得达到最大值。研究结论可为土工格栅-粗粒土的理论及设计工作提供数据支撑及技术参考，具有一定工程意义。

Research on direct shear test of geogrid coarse grained soil interface considering effect of aperture ratio
ZHANG Ke¹, YAO Xiaoping²
1. Henan Vocational College of Industry and Information Technology, Jiaozuo 454000, China;
2. Henan Polytechnic University, Jiaozuo 454000, China
Abstract: In order to study the influence of the aperture ratio (d₅₀/L_a) on the dynamic shear behavior of geogrid coarse-grained soil interface, four kinds of d₅₀/L_a (0.04, 0.08, 0.12, 0.20) cyclic shear model tests were carried out. The test results show that the cyclic shear hysteretic curves of reinforced soil interface are inclined rhombus under different d₅₀/L_a. The shear stress peak value of reinforcement soil interface increases first and then decreases with the increase of d₅₀/L_a, and reaches the maximum value when d₅₀/L_a=0.08. The final shear shrinkage of soil sample increases gradually with the increase of d₅₀/L_a. In terms of dynamic characteristics, the shear stiffness of the steel soil interface increases with the shear cycle, while the damping ratio decreases, and there is an optimal d₅₀/L_a (0.08 and 0.2 respectively) to reach the maximum. The research results can provide data support and technical reference for the theory and design of geogrid coarse-grained soil, which has certain engineering significance.
Keywords: geogrid soil interface;coarse grained soil;cyclic shear characteristics;direct shear test
2021, 47(6):51-56  收稿日期: 2021-02-10;收到修改稿日期: 2021-03-20
基金项目: 国家自然科学基金面上项目（41672240）
作者简介: 张珂(1984-),女,河南焦作市人,讲师,硕士,研究方向为建筑施工技术、地基与基础施工、建筑施工组织等
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