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Use of Microgrid Inclusions to Reinforce Sand

机译：使用微网夹杂物加固沙子

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At the granular scale, use of fibers mixed within a soil is a demonstrated means of reinforcing both clays and sands, increasing strength, stiffness and ductility of the composite material. At a large scale, use of geosynthetic elements like geotextiles and geogrids provide an increase in composite strength and behavior by confining a reinforced soil mass with evenly placed tensile inclusions. Within this study, concepts of fiber-reinforced soil and geogrids are fused, focusing on randomly-oriented, small grid inclusions ("microgrids"), of various concentrations and aspect ratios mixed within dry sand. The addition of microgrids enabled improved strength and ductility of reinforced composites due to frictional interlock with small grid apertures and the tensile strength of the inclusions. Application of microgrid reinforcement increased soil strength soil by 5 to 10 degrees. Factors that affected behavior included aspect ratio, microgrid concentration by weight and confining pressure. The interlock behavior of microgrids and soil grains are based on frictional mechanisms similar to those of geogrids, demonstrating a dependence on grid transverse member thickness and aperture size in comparison to grain size. However, unlike large-scale reinforcements like geogrids, true soil composite behavior may be better exhibited upon homogenous admixing.
机译：在颗粒尺度上，使用混合在土壤中的纤维是增强粘土和沙子，增加复合材料的强度，刚度和延展性的有效手段。在大范围内，土工合成材料（如土工布和土工格栅）的使用通过将增强的土体与均匀分布的拉伸夹杂物一起封闭，从而提高了复合强度和性能。在这项研究中，将纤维增强土壤和土工格栅的概念融合在一起，重点放在干沙中混合的各种浓度和纵横比的随机定向的小格栅夹杂物（“微格栅”）上。微网格的添加由于具有较小网格孔的摩擦互锁和夹杂物的拉伸强度，从而提高了增强复合材料的强度和延展性。微格栅加固的应用使土壤强度增加了5到10度。影响行为的因素包括长宽比，微网格重量（按重量）和围压。微格栅和土壤颗粒的互锁行为基于类似于土工格栅的摩擦机制，证明了与颗粒尺寸相比，其对格栅横梁厚度和孔径的依赖性。但是，与土工格栅等大型钢筋不同，均匀混合后可能会更好地表现出真正的土壤复合材料行为。

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