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通过经编土工格栅、单向土工格栅与粗砂、圆砾、残积土在不同法向压力下的拉拔试验,研究土工格栅与土界面特性。结果表明,单向格栅界面的拉拔系数和摩擦系数均小于经编土工格栅界面,界面摩擦系数随着土体颗粒粒径的增大而增大。同时结合有限元分析的方法,将数值结果与试验结果进行比较,进一步研究了法向压力、加筋长度、土体模量、格栅轴向刚度、界面折减因子等参数对界面特性的影响。最后研究了不同拉力作用下的界面剪应力和轴力分布规律。
Through the warp geogrid, one-way geogrid and coarse sand, round gravel, residual soil under different normal pressure pull test, research geogrid and soil interface characteristics. The results show that the pulling coefficient and the friction coefficient of the unidirectional grating interface are all less than that of the warp grid interface. The friction coefficient of the interface increases with the increase of the particle size of the soil. At the same time, the numerical results are compared with the experimental results by means of finite element analysis. The effects of parameters such as normal pressure, stiffener length, soil modulus, axial stiffness of grille and interface reduction factor on interface properties are further studied . Finally, the law of interfacial shear stress and axial force distribution under different tensile forces is studied.