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为了研究筋—土界面在遭受动力作用时的表现,利用大型直剪仪对土工格栅、土工编织布、土工无纺布和砂土界面进行了一系列循环剪切试验,得到了不同工况下界面的剪切刚度和阻尼比,并探究了循环次数与剪切刚度和阻尼比之间的规律。研究结果表明,同一循环次数时格栅—土界面的循环剪切刚度最大,土工编织布—土界面的阻尼比最大;剪切位移幅值为3 mm时3种竖向应力下界面都呈现出循环剪切硬化的特征,随着循环次数的增加,各竖向应力下的界面阻尼比有趋于某一值的趋势;砂土密实度越大,同一循环次数对应的剪切刚度越大,阻尼比越小,且随着循环次数的增加3种砂土密实度的界面阻尼比有趋于同一值的趋势;循环剪切位移幅值为5 mm的界面发生循环剪切软化现象,剪切位移幅值越大,界面同一循环次数的阻尼比也越大。
In order to study the performance of tendon-soil interface under dynamic force, a series of cyclic shear tests were carried out on the interface of geogrid, geotextile, geotextile and sand with a large direct shear instrument. Different working conditions The shear stiffness and damping ratio of the lower interface, and explore the law between the number of cycles and the shear stiffness and damping ratio. The results show that the cyclic shear stiffness of the grid-soil interface is the largest at the same cycle number, and the damping ratio at the geotextile-cloth-soil interface is the largest. When the shear displacement amplitude is 3 mm, the interface under the three kinds of vertical stresses With the increase of the number of cycles, the damping ratio of the interface under each vertical stress tends to a certain value. The greater the density of sand, the larger the shear stiffness corresponding to the same number of cycles, The smaller the damping ratio is, the more the number of cycles is, the more the damping ratio of the three kinds of sands is. The interfacial damping ratios tended to be the same value. The cyclic shear softening phenomenon occurred at the interface with cyclic shear displacement amplitude of 5 mm, The larger the amplitude of displacement, the larger the damping ratio of the same cycle of the interface.