多层土工合成材料受力特性有限元研究

应用有限元法对多层土工合成材料系统中单层拉力进行了研究，模拟了日本宇都宫大学今泉繁良教授的四层土工合成材料直剪试验，比较计算结果与试验结果，验证了有限元模型的正确性，明确了拉应力和摩擦应力的分析，改变模型的参数进行计算，进一步研究了影响材料所受拉力大小的因素，计算结果与Koerner的理论结果进行对比。研究结果表明，材料的刚度影响其受力的大小，各层土工合成材料之间的受力相互影响。因此，计算单层拉力时应该对多层土工材料系统进行整体分析。

FEM Study on Behavior of Multi-layered Geosynthetics

In this paper, FEM studies in plane strain were presented to investigate the tensile force carried by one layer of multi layered geosynthetics. First, the tests conducted by Professor S. Imaizumi, Utsunomiya University of Japan, were simulated by using ANSYS, and the calculation results were compared with test results. The distribution of tensile stress and frictional stress were clarified. Secondly, the tests were expanded by FEM. The results were compared with that derived by Koerner's theory in which only peak frictional resistance on interfaces was considered. It is found that the stiffness of geosynthetic influences the tensile force carried by it and the tensile force carried by each layer of multi layered geosynthetics interact. So, it is the whole multi layered geosynthetics that should be analyzed to determine the tensile force of one layer.