Geogrid-Aggregate Interlock Mechanism Investigated through Aggregate Imaging-Based Discrete Element Modeling Approach
Geogrid-Aggregate Interlock Mechanism Investigated through Aggregate Imaging-Based Discrete Element Modeling Approach
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DOI：
10.1061/(asce)gm.1943-5622.0000113
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发表时间：
2012-08-01
影响因子：
3.7
通讯作者：
Bian, Xuecheng
中科院分区：
文献类型：
--
作者：
Tutumluer, Erol;Huang, Hai;Bian, Xuecheng
土工格栅通常用于道路建设中的稳定和加固目的。影响土工格栅和骨料之间的相互作用或互锁机制的因素可包括但不限于骨料尺寸和形状以及土工格栅类型和性质。为了更好地量化这些影响，本文介绍了一种聚合物图像辅助离散元法（DEM）建模方法。DEM模拟的实验室直接剪切试验进行的未加筋和土工格栅加筋骨料剪切盒样品表明，集料成像辅助DEM可以准确地预测未加筋和土工格栅加筋骨料的强度特性。土工格栅的使用通过约束骨料在剪切区中的运动来增加骨料组件的剪切强度，这通常被称为在该骨料-土工格栅复合系统中的土工格栅的硬化效应。还提出了关于具有各种开口形状和几何形状的土工格栅对机械联锁的影响的初步研究结果，以证明聚合物图像辅助DEM模型的有效性及其量化土工格栅孔径尺寸和形状相对于聚合物尺寸和形状、级配和密度的个体影响的潜力。以及肋的形状和刚度以及各种土工格栅产品的肋之间的连接的刚度。(c)2012年美国土木工程师学会。
Geogrids are commonly used in road construction for stabilization and reinforcement purposes. Factors affecting the interaction or interlock mechanisms between geogrids and aggregates may include, but are not limited to, aggregate size and shape and geogrid types and properties. To better quantify these effects, an aggregate image aided discrete element method (DEM) modeling approach is introduced in this paper. DEM simulations of laboratory direct shear tests carried out on both unreinforced and geogrid-reinforced aggregate shear box samples indicate that the aggregate imaging aided DEM can accurately predict both unreinforced and geogrid-reinforced aggregate strength properties. The use of geogrids increased the shear strength of the aggregate assembly by constraining the movement of the aggregates in the shear zone, which is often referred to as the geogrid's stiffening effect in this aggregate-geogrid composite system. Preliminary findings on the effects of geogrids with various opening shapes and geometries on the mechanical interlock are also presented to demonstrate the effectiveness of the aggregate image aided DEM model and its potential for quantifying the individual effects of geogrid aperture size and shape relative to aggregate size and shape, gradation, and density, as well as the shape and stiffness of the ribs and the stiffness of the junction between the ribs of various geogrid products. (c) 2012 American Society of Civil Engineers.