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首页> 外文期刊>International journal of geomechanics >Modeling Geogrid Pullout Behavior in Sand Using Discrete- Element Method and Effect of Tensile Stiffness
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Modeling Geogrid Pullout Behavior in Sand Using Discrete- Element Method and Effect of Tensile Stiffness

机译：离散元法模拟砂土中土工格栅的拉拔行为及抗拉刚度

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In this study, a series of numerical pullout tests was performed using the discrete-element method (DEM) to investigate the micromechanical behavior of geogrid pullout and the effect of geogrid tensile stiffness. Geogrid-soil interaction during pullout was investigated not only through displacement fields and force chains inside the soil but also via the quantitative displacement and force distributions along the geogrid. The active and inactive zones were defined based on the displacement fields in the soil, and the displacement corresponding to the boundary between the active and inactive zones was found to be 1.25mm in this study. The higher the geogrid stiffness, the larger was the thickness and length of the active zone mobilized in the soil under the same pullout displacements. The thickness and length for the geogrid with largest tensile stiffness were 150 and 500 mm (full length of geogrid), respectively. Reorientations of contacts and forces within both the inactive and active zones were further visualized based on the Fourier-series approximation. The part of the geogrid that experienced displacement of more than 1.25mm (used for the definition of the active zone) is defined as the affected part, and its corresponding length is defined as the affected length. The stiffer geogrid was found to activate the affected length into the full range more rapidly than the less stiff one prior to failure. The tensile forces at the load ends of stiff geogrids were larger than those at the load ends of extensible geogrids at all given pullout displacements. (C) 2019 American Society of Civil Engineers.
机译：在这项研究中，使用离散元方法（DEM）进行了一系列数值拉拔试验，以研究土工格栅拉拔的微观力学行为以及土工格栅拉伸刚度的影响。不仅通过位移场和土壤内部的力链，而且通过沿土工格栅的定量位移和力分布，研究了拔除过程中土工格栅与土壤的相互作用。根据土壤中的位移场来定义活动区和非活动区，本研究发现对应于活动区和非活动区边界的位移为1.25mm。土工格栅刚度越高，在相同拔出位移下在土壤中活动的活动区的厚度和长度就越大。具有最大抗拉刚度的土工格栅的厚度和长度分别为150毫米和500毫米（土工格栅的全长）。基于傅立叶级数近似，可以进一步可视化非活动区域和活动区域内的接触和力的重新定向。土工格栅中位移超过1.25mm的部分（用于定义活动区域）被定义为受影响的部分，其相应的长度被定义为受影响的长度。发现较坚硬的土工格栅比失效前较不坚硬的土工格栅更快地将受影响的长度激活到整个范围。在所有给定的拔出位移下，刚性土工格栅的荷载端的拉力大于可伸展土工格栅的荷载端的拉力。 （C）2019美国土木工程师学会。

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